Industrial Ethernet

Data Data Commu Commu nicatio n wit h Industri al Ethernet Ethernet

SIMATIC S7

Date: File:

Siemens AG 2008. All rights reserved.

18.09.2009 PRO3_08E.1

Co n t en t s Object Objective ives s

SITRAIN Training for Automation and Industrial Industrial Solutions

Pag e ...... ......... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... .....

2

Subnets Subnets in SIMATIC SIMATIC .......... ............... .......... ........... ........... .......... .......... .......... .......... ........... ........... .......... .......... .......... ........... ............ ............ ........... .......... .......... ........... ........... ..... Communicat Communication ion Services Services for SIMATIC SIMATIC ........... ................ ........... ............ ........... .......... .......... .......... ........... ........... .......... .......... ........... ............ ............ ........... .....

3 4

Indust Industria riall Ethern Ethernet et – An Overvi Overview ew

...... ......... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... .....

5

Ethernet Ethernet CP Communica Communications tions Services Services ........... ................ .......... .......... .......... ........... ........... .......... ........... ............ ............ ............ ........... .......... ........... ........... ..... Functi Functions ons and Servic Services es ...... ......... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ..... ..... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...

6 7

Defini Definitio tion n of Terms Terms ...... ......... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ... Structure Structure of the IP Address Address (Internet (Internet Address) Address) ........... ................ ........... ............ ........... .......... .......... ........... ............ ........... .......... .......... .......... ........... ........

8 9

Integrating Integrating an Etherne Ethernett CP in the the Hardware Hardware Configu Configuration ration ........... ................ .......... .......... .......... ........... ............ ........... .......... ........... ........... .....

10

Assigning Parameters to the Ethernet Ethernet Interface ..................................... ........................................................................... ........................................... .....

11

Loadin Loading g the Config Configura uratio tion n Data Data

...... ......... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ..... ..

12

.......... ............... .......... ........... ........... .......... ........... ............ ........... ........... ............ ........... .......... ........... ........... ........... ............ ........... .......... .....

13

Creating/Ins Creating/Inserting erting a New Connection Connection ........... ................. ........... .......... .......... .......... ........... ............ .......... .......... ........... .......... ........... ........... .......... ........... ........... .....

14

Connection Connection Properties Properties

15

Communicat Communication ion Connection Connections s

.......... ............... ........... ............ ........... ........... ............ ........... .......... .......... .......... .......... .......... ........... ............ ............ ........... .......... ........... .......... .......... ......

Functions Functions for Data Transfer Transfer

........... ................ .......... .......... ........... ............ ............ ............ ........... .......... .......... .......... .......... ........... ............ ............ ........... ......... .......... ........ ..

16

SIMATIC_N SIMATIC_NET_C ET_CP P Library Library

........... ................ .......... ........... ........... .......... ........... ........... ........... ........... ........... ........... .......... ........... ........... .......... ........... ............ ........... ........ ...

17

Communicat Communications ions Structure Structure

........... ................ ........... ............ ........... .......... .......... .......... ........... ........... .......... .......... ........... ............ ............ ........... .......... ........... ........... ........ ...

18

Communicat Communications ions Structure Structure

........... ................ ........... ............ ........... .......... .......... .......... ........... ........... .......... .......... ........... ............ ............ ........... .......... ........... ........... ........ ...

19

Exercise Exercise 1: Configuring Configuring a CP and and Assigning Assigning Parameters Parameters to to It .......... ................ ............ ........... .......... .......... .......... .......... ........... ........... .......

20

Exercise Exercise 2: 2: Creating/ Creating/Insert Inserting ing an an ISO-on-T ISO-on-TCP CP Connect Connection ion .......... ................ ............ ........... .......... .......... .......... .......... .......... ........... ........... .....

21

Exercise Exercise 3: Assigni Assigning ng Parame Parameters ters to the the ISO-onISO-on-TCP TCP Connection Connection ........... ................ .......... .......... .......... .......... ........... ............ ......... ...

22

Exercise Exercise 4 : Expandin Expanding g the S7 and and Operator Operator Panel Program Program ........... ................ .......... ........... ............ ........... .......... .......... .......... .......... ....... ..

23

Exercise Exercise 5: Communica Communication tion via ISO-on-TCP ISO-on-TCP Connection Connection .......... ............... .......... ........... ........... ........... ........... .......... ........... ........... .......... ........ ...

24

SITRAIN Training for Automation and Industrial Solutio ns

Page 1

ST-PRO3 Industrial Ethernet

Objectives

At t he end o f the t he ch apter apt er th e part ic ipant ip ant w il l ...

SIMATIC S7 Siemens AG 2008. All rights reserved.


...

have re received an an ov overview of of th the mo most im important ba basics of Industrial Ethernet

…

be able to assign parameters to an Ethernet communications module and network it

…

be able to program the SEND/RECV user interface

Date: File:

18.09.2009 PRO3_08E.2

Page 2

SITRAIN Training for Automation and and Industrial Solutions


Subnets in SIMATIC

PG720

OPs

PC, OS

PG

MPI Network Industrial Ethernet Point to Point

PROFIBUS

SIMATIC S5

S7-400

M7-400

S7-300

Cell Level

-SINUMERIK, RCM -TI 505 -Other PLC

PROFIBUS-DP

Field Level

DP/AS-I Link ET 200C

ET 200B/L ASI (Actu ator Senso r Int erfac e) AS-I Submodule

AS-I Power Supply Field device with AS-I ASIC

SIMATIC S7

Date: File:


AS-I Level

Sensors and Actuators

18.09.2009 PRO3_08E.3

SITRAIN Training for Automation and Industrial Solutions

Overview

SIEMENS offers the following subnets, depending on the different requirements for the communication tasks in the cell area (non-time critical) or in the field level (time critical).

MPI

The MPI subnet is designed for tasks in the cell area. The MPI is the multi-point capable interface in SIMATIC S7. It is designed as the PG interface, that is, for the connection of PGs (commissioning and test) and OPs (operator interface). Beyond that, the MPI subnet can also be used to network a few CPUs.

Industrial Ethernet

Industrial Ethernet is the network for the management level and the cell level in the open, manufacturer independent communication system of SIMATIC. Industrial Ethernet is designed for the non-time critical transmission of larger amounts of data and offers the possibility of connecting to location crossing networks via Gateways.

PROFIBUS

PROFIBUS is the network for the cell and field area in the open, manufacturer independent communication system of SIMATIC. There are two versions each with their own characteristics: •

in the cell area as PROFIBUS for the non-time critical communication between equal, intelligent nodes.

•

as field bus PROFIBUS DP for time critical, cyclical data exchange between intelligent masters and field devices.

PtP-Connection

Point-to-Point connections are mainly used for the non-time critical data exchange between two stations or for the connection of devices, such as OPs, printers, bar code readers, magnetic card readers etc. to a station.

AS-Interface

The Actuator-Sensor-Interface is a subnet for the lowest process level in PLC systems. With its help, binary sensors and actuators can be networked.


Page 3


Communication Services for SIMATIC n o i t 7 a c S i n C I u T m A m M I o S C

Global Data PG and HMI Functi ons S7 Basic Comm . S7 Expanded Communi cation

. f n s o d C r a . d m n a m t o S C

FDL

ISO Transport TCP/ISO-on-TCP UDP

. c i n n u e p m O m o C

FMS

MAP 3.0

DP MPI

SIMATIC S7

Profibus

Date: File:


18.09.2009 PRO3_08E.4

Ethernet


Services

A communications service describes communications functions with defined performance characteristics, such as exchanging data, controlling devices, monitoring devices, and loading programs.

Global Data

GD (Global Data in the network) for cyclical data exchange of small amounts of data (in S7-400 additionally event-driven).

S7 Communication

These communication utilities are optimized for the communication of S7 PLCs, PGs/PCs and OP/TDs (Text-Displays) in the SIMATIC S7 connection. • PG functions; a PG can be connected without configured connection. • HMI functions; an OP can be connected without a configured connection. • Basic communication is implemented with SFCs that are contained in the CPU’s operating system. (SFC communication runs without configured connection). • Expanded communication takes place via configured connections with the help of SFBs (S7-400 Client/Server; S7- 300 only Server).

FDL (SDA)

For the safe data transfer of average amounts of data between SIMATIC S7 and S5. Corresponds to Layer 2 Fieldbus Data Link (FDL) for Profibus.

ISO-Transport TCP, ISO-on-TCP UDP

Is used for the safe data transfer of average to larger amounts of data from SIMATIC S7 to PCs or non-Siemens systems using Industrial Ethernet networks. The FDL, ISO, TCP , ISO-on-TCP and UDP utilities are made available on the CPU using the functions AG-SEND/RECV or AG-LSEND/LRECV.

FMS

Fieldbus Message Specification (FMS) makes the object-oriented communication between intelligent partners as well as field devices possible. Utilities supported by FMS (variables, domain services, etc.) are specified in EN 50170 Vol. 2.

MAP

Originally developed by the American automobile company General Motors, this protocol is for object-oriented communication between PLC systems (MAP= Manufacturer Automation Protocol).

DP

The DP (Distributed I/O) protocol is specially optimized for the time-critical, dataoriented communication from intelligent control units (DP Masters) to field devices (EN 50170 Vol. 3).


Page 4


Industrial Ethernet – An Overview

SIMATIC S7

Date: File:


Overview

18.09.2009 PRO3_08E.5


One of the most important industrial communication networks in the field of SIMATIC NET is Industrial Ethernet (IE). Industrial Ethernet is a communication network using basic band transmission technology according to the international IEEE 802.3 standard with CSMA/CD (Carrier Sense with collision detection) access procedure. Networking takes place at a transmission speed of 10/100 MBit/s using fiberoptic cable or shielded 2-wire cables (Industrial Twisted Pair ITP). In the open, manufacturer-independent communications system of SIMATIC, Industrial Ethernet represents the network system for the production control and cell levels. Industrial Ethernet is suitable for fast data transmission of large amounts of data and by using gateways and routers provides cross-location networking.

SIMATIC S7

For communication using Industrial Ethernet in the SIMATIC environment there are different possibilities available that are typically identified as communication types, depending on the requirement. The spectrum ranges from the generally valid Standard Protocols that are found in S5-compatible communication up to the user-friendly S7 communications mechanisms adapted for SIMATIC components. The TCP/IP and UDP standardized protocols as well as special protocols for industry automation such as ISO Transport and ISO-on-TCP connections are used. For the diverse Ethernet communications processors (CP) there is a series of communications types available in SIMATIC depending on the type.


Page 5


Ethernet CP Communications Services

PG/OP communic ation S7 communication S5-compatible communication

PROFINET communication

Via the protoco ls - ISO - TCP/IP ( RFC 1006) With SEND /RECEIVE int erface via protocols - ISO-Transport - ISO-on-TCP (TCP/IP wit h RFC 1006) - TCP – UDP - E-Mail With FETCH/WRITE servi ces v ia protocols -ISO-Transp ort , -ISO-on-TCP -TCP Via the protoco ls -TCP

HTML process contr ol via web browser

Via the protoco ls - HTML/ IP protocol

File management and fi le access vi a FTP

Via the protoco ls - FTP/ IP protoc ol

SIMATIC S7

Date: File:


18.09.2009 PRO3_08E.6


PG/OP

The PG/OP communication is used for loading programs and configuration data, for carrying out test and diagnostic functions as well as for monitoring and control of a system using HMI systems.

S7 Communication

The S7 communication forms a simple and efficient interface between SIMATIC S7 stations and the PG/PC using communication function blocks.

S5–compatible

The SEND/RECEIVE interface enables program-controlled communication using a configured connection from SIMATIC S7 to SIMATIC S7, SIMATIC S5 and to the PC/PG.

IT Functions

Features of IT communication are the sending of e-mails, the monitoring of device data and process data ( HTML process control) and FTP functions (File Transfer Protocol) for file management as well as accesses to data blocks in the CPU (Client and Server function).

PROFINET

PROFINET is a standard of the PROFIBUS user organization (PNO) that defines a cross-manufacturer communications and engineering model. An S7-300 station equipped with a PROFINET–capable CP can be interconnected in SIMATIC iMap as a PROFINET component.


Page 6


Functions and Servic es S7 Connection s Connection type that can be configured in all S7/M7 devices. The SFBs BSEND/BRCV are used. Acknowledgement takes place. S7 Connecti ons, hi gh-MTBF Like S7 connections; however limited to S7-H-CPUs as well as SIMATIC PC stations (such as, OPC-Server). ISO Transpor t Connecti on The ISO transport connection is suitable for large amounts of data because of "Data Blocking". Transmission via "Send/Receive" as well as "Fetch and Write". ISO-on-TCP Connection The ISO-on-TCP connection conforms to the TCP/IP Standard with the expansion of RFC 1006 according to Layer 4 of the ISO Reference Model. Transmission can take place via "Send/Receive" as well as "Fetch and Write". Receipt of data is confirmed through an acknowledgement. TCP Connectio n The TCP connection conforms to the TCP/IP Standard. Data transmission takes place via "Send/Receive" as well as "Fetch and Write". UDP Connection The UDP connection (User Datagram Protocol) enables unsecured transmission of continuous data blocks between two nodes. SIMATIC S7 Siemens AG 2008. All rights reserved.

Date: File:

18.09.2009 PRO3_08E.7


General

For connection configuration with STEP 7 (NetPro tool), you can explicitly select the suitable connection type.

ISO-on-TCP

ISO-on-TCP is meant for secured cross-network data transmission. The ISO-onTCP protocol corresponds to the TCP Standard with the RFC 1006 addendum which enables the transfer of data blocks. The advantage is that the transmission security is very high due to automatic repetition and automatic block test mechanisms. For communication between SIMATIC devices, the use of ISO-on-TCP connections is recommended. Of course, both partners must fulfill the RFC 1006 Standard. The communications partner confirms the data receipt using the SEND/RECEIVE interface.

TCP/IP

The TCP connection is also called TCP-native or TCP/IP connection. With the TCP connections and the SEND/RECEIVE interface, the Ethernet-CP supports the socket interface (such as, winsocket.dll) to TCP/IP which is available on almost every end system (PC or other system). TCP/IP connections should be used for the connection to other systems if these do not support the RFC 1006 protocol addendum.

ISO Transpo rt The ISO protocol is, according to the ISO 8073 standard, an open protocol for secured data transmission using configured connections. ISO Transport is transmitted exclusively using Industrial Ethernet and is optimized for use on the production level. UDP

UDP is meant for simple, cross-network data transmission without acknowledgement. Through UDP connections, broadcast and multicast telegrams can also be sent.


Page 7


Defini tion o f Terms

IP = 192.168.0.3

1

2

MAC = 08-00-06-01-CA-FE Subn et mas k = 255.255.255.0

IP = 192.168.0.2 MAC = 08-00-06-01-AD-AC Subnet mask = 255.255.255.0

Computer 1 woul d like to build u p a conn ection to Comput er 2:

1.

ARP query to all (MAC broadcast) from Computer 1: “Who has IP address 192.168.0.2?“

2.

ARP answer from Computer 2: “The MAC address to 192.168.0.2 is 08-00-06-01-AD-AC.“

3.

The connection can be built up.

SIMATIC S7

Date: File:


ARP

18.09.2009 PRO3_08E.8


To determine the Ethernet address of the receiver, the IP driver makes use of the ARP protocol structure (Address Resolution Protocol). In every TCP/IP-capable computer there is such an ARP table in which the assignment of IP address to Ethernet address exists.

MAC Address

Since all stations are connected to the same bus cable, it is necessary for targeted addressing that every participant has its own address through which it is then accessible in the network. For this, every Ethernet interface has been assigned a fixed and world-wide unique address by is manufacturer. This address is called hardware or MAC address (Media Access Control). It is stored on the network card and is used for unique identification in the local network. Manufacturer cooperation ensures that the address is unique world-wide.

DHCP

DHCP (“Dynamic host configuration protocol“) is a protocol developed by Microsoft for the dynamic assignment of IP addresses. Each computer or CP in the network requires its own IP address. Insofar as a DHCP server is set up, it automatically assigns querying computers in the network addresses out of a defined IP address pool. A computer sends an address request and then is assigned its IP address from the DHCP server. No fixed addresses have to be assigned which considerably reduces the configuration effort for a network.

Subnet Mask

With the subnet mask, the division of the IP address into network and computer address is carried out. Furthermore, a network can be further divided into subnets with the subnet mask. As a result, a part of the computer address is used as the subnet(work) address. That way, networks can be flexibly adapted to organizational and physical factors.


Page 8


Structur e of the IP Addr ess (Internet Ad dress )

Addresses of Type A

(for a few subnets, but many stations per subnet)

b31

b0

Version

0

Subnet

Station address

Addresses of Type B

(for a fair number of subnets and stations)

b0

b31 Version

10

Subnet

Addresses of Type C

Station address

(for many subnets, but only a few stations per subnet)

b31 Version

110

Date: File:


IP Address

Station address

Subnet

SIMATIC S7

b0

18.09.2009 PRO3_08E.9


Each computer that is connected to the Internet has an IP address. It is usually specified in the Dottet Quad Notation or Standard Dot Notation. The 32 bit long IP address is represented in 4 decimal numbers that are separated by a period: for example, 192.168.111.100. Internet addresses are not assigned to a computer, rather to the network interfaces that a computer has in different networks. The IP address consists of three parts:

Note

• •

the network ID or network classs A, B or C Network Address or Net ID

•

System address or local address or Host ID

Type A:

127 networks, 24 bit Host ID:

0 - 127.H.H.H

Type B:

16,383 networks, 16 bit Host ID:

128 - 191.N.H.H

Type C:

approx. 2 million networks, 8 bit Host ID:

192 - 223.N.N.H

Type D:

Multicast:

224-239.M.M.M

Type E:

Reserved:

240-255.R.R.R

The network with the number 127 can not be used (loopback interface of IP implementation: 127.0.0.1 = localhost). Host IDs whose bits are all set to 0 or 1 are reserved for special functions, such as, broadcasting, and therefore may not be assigned. Carefully check the assignment of the IP addresses, if necessary, with the support of the DV administration.


Page 9


Integrating an Ethernet CP in the Hardware Configuration

SIMATIC S7

Date: File:


18.09.2009 PRO3_08E.10


Task

The communication processors (CP) are configured and assigned parameters in the Hardware Configuration – just like all other modules. The CPs are interconnected to a functioning network by means of IE cables and a switch / hub or ESM module (Electrical Switch Module).

What to Do

The following configuration steps are necessary: 1.

commission Ethernet CPs with STEP 7,

2.

load configuration data in the participating target systems,

3.

configure communications services and load them,

4.

program SEND / RECEIVE interface

To be able to connect the SIMATIC stations to an Ethernet subnet, create a subnet in your project. It is advisable to create the subnet before you configure the stations since the assignment of the SIMATIC stations then essentially takes place automatically. To do so, select the optionsInsert  Subnet  Industrial Ethernet in the SIMATIC Manager . Result

A new subnet Ethernet (1) is then created in the project. All SIMATIC stations existing in the project can be connected to this subnet. If you prefer a graphic network display, select the network object Ethernet(1) and open this object by double-clicking on it.


Page 10


As sig ni ng Parameters t o t he Ether net Int erf ace

SIMATIC S7

Date: File:


General


18.09.2009 PRO3_08E.11

When you use the TCP/IP Protoco l, the MAC address as well as the IP parameters are displayed. The default values can be changed accordingly. ISO and/or IP Protocol must be explicitly selected. In addition, a Router with its IP address can also be configured.

What to Do

1. Select the following MAC and IP addresses: -

for Station 1: 08-00-06-01-74-10;

-

for Station 2: 08-00-06-01-74-20;

-

for Station 1: 192.168.111.101;

Subnet mask:

255.255.255.0

-

for Station 2: 192.168.111.105;

Subnet mask:

255.255.255.0

2. Select the desired subnet type Ethernet(1) from the Subnet list. Important: Both stations must be connected to the same Ethernet. 3. Make sure you confirm your entries with OK since only then does the networking with its properties take place. The CP is now configured as the network node for the associated S7 station. 4. Save and compile your configuration. Note

All steps must be repeated for each station.


Page 11


Loading th e Config uration Data

Procedure for dow nloading the confi guration data: 1. In the Windows Control Panel, open the "Set PG/PC Interface" dialog box 2. Set the PG/PC interface according to the CPs on your PG and according to the bus connection (interface parameter settings used). You will find additional detailed information in the Online - Help. 3. Set the CPU to the STOP state. 4. Select the menu options PLC PLC

Download... or Upload...

STEP 7 will then display dialog boxes to guide you through the procedure. SIMATIC S7

Date: File:


Principle

18.09.2009 PRO3_08E.12


The project data of the Ethernet CP is loaded from the hardware configuration. All configuration data of the S7 station is loaded.The data of the connection c onfiguration must be transferred separately. You can use the MPI connection for loading the configuration data or for the first-time assignment of a MAC address (node initialization). As of STEP7 V5.3, after successful node initialization you can also use the PG‘s IE interface for loading the configuration data.

Type of Connection

You can load the configuration data into the S7 station using the MPI connection or the Ethernet. Prerequisite for loading using Ethernet is the node initialization.

Node Initialization

In the so-called "node initialization", you initially supply the Ethernet CP with a MAC address or an Internet address. The node initialization is only possible using the MPI connection.


Page 12


Communication Connection s

SIMATIC S7 station with Ethernet CP

Ethernet node

send

communication connection

receive

receive send

Ethernet node send

communication connection

receive

SIMATIC S7

Date: File:


Connections

18.09.2009 PRO3_08E.13

receive send


A communication connection permits program-controlled communication with the following properties between two nodes on the Industrial Ethernet: -

The data transfer is bidirectional. That is, data can be sent and received at the same time via the connection.

-

Both nodes have equal rights. That is, either node can initiate Send or Receive activities as events demand.

-

The address of the communication partner is specified by configuration. Exception: In the case of a "free UDP connection", the address is specified at the FC interface in the user program.

General

The way the Ethernet CP works for a communication connection is to send and receive data through the Ethernet and to exchange data with the user program in the S7 CPU.

Note

All stations outside of the STEP 7 project must be configured with dummy objects such as, "SIMATIC S5" or "Other Station". Or, the Partner type is "Unspecified " when you create the connection.


Page 13


Creatin g/Inserting a New Connection

Double-click

SIMATIC S7

Date: File:


18.09.2009 PRO3_08E.14


Creating/Inserting a Connection

ISO-on-TCP connections to other stations can also be c reated if the other station is not stored in the same project. In the dialog shown (above) to create the connection, you simply select "unspecified" as the connection partner.

What to Do

1. In the SIMATIC Manager, select the menu options Options  Configure Network. The NetPro configuration window is then displayed. As an alternative, you can double-click (the created) Ethernet(1). 2. Select the CPU as connection-capable module and in the lower window of the Connection Table select an empty line in which you enter the new connection. 3. With a double-click on the empty line or by using the menu optionsInsert  New Connection..., insert the required ISO-on-TCP connection. 4. In the dialog that pops up, select your connection partner and the type of connection.


Page 14


Connection Properties

SIMATIC S7

Date: File:


At tr ib ut es

18.09.2009 PRO3_08E.15


You should pay attention to the following connection properties: Local ID:

Is identical to the value in the connection list

Name:

Suggested name, plus connection number suffix. Can be changed by the user as required (max. 24 characters).

Via CP:

If there are several CPs of the same type in the station that are all connected to the same subnet, you can select the one you want to use for the connection by clicking the Route... button.

Active connection establishment By default, the connection establishment is active. In the case of an unspecified connection, the connection is established passively. ON: Connection is established actively Off: Connection is established by p artner Block Parameters ID

To identify the connection this block call parameter must be entered when the FC is called in the user program.

LADDR

To identify the connection this block call parameter must be entered when the FC is called in the user program. Transport Service Access Point, is used for the logical identification of a connection (default values can be used here).

TSAP

Loading

After saving and compiling the connection configuration, both stations have to be loaded. To do so, select the station with an existing Ethernet or MPI connection. Use the menu options PLC  Download to Current Project to now load the two stations.

Result

Both SIMATIC stations are connected to one another through a working ISO-onTCP connection.


Page 15


Functions for Data Transfer

The FC blocks are supplied with the NCM S7-Ethernet configuration tool (SIMATIC_NET_CP Library). The following table shows the default block numbers. You can change the block numbers if you wish.

Function

Symbolic Name

Explanation

FC5

AG_SEND

Send data <= 240 bytes

FC6

AG_RECV

Receive data <= 240 bytes

FC7

AG_LOCK

Disable Fetch/Write data exchange

FC8

AG_UNLOCK

Enable Fetch/Write data exchange once more

FC50

AG_LSEND

Send data up to 8192 bytes

FC60

AG_LRECV

Rec. data up to 8192 bytes

SIMATIC S7

Date: File:


Note

18.09.2009 PRO3_08E.16


For data transmission using TCP/IP Connectio ns, you can only use the functions -

FC 50 "AG_LSEND", FC 60 "AG_LRECV"

regardless of the amount of data to be transferred. The earlier differentiation between FC 5 "AG_SEND" and FC 50 "AG_LSEND" as well as FC 6 "AG_RECV" and FC 60 "AG_LRECV" is no longer valid as of block version V 4.1. As of this version, FC 5 and FC 6 are also capable of processing long send and receive requests.


Page 16


SIMATIC_NET_CP Library

SIMATIC S7

Date: File:


General

18.09.2009 PRO3_08E.17


Different FCs have to be used for S7-300 and S7-400. As well, there are also different block versions with possibly deviating behavior. Please pay attention to the version identifications in the subdirectories in the SIMATIC_NET_CP Blocks Library as well as to the version identifiers of the blocks themselves.

AG_SEND

The block passes the user data from the specified user data area to the Ethernet CP. The Ethernet CP independently triggers the transfer to the partner station.

AG_RECV

The block accepts the user data received from the partner station in the user data area specified in the call.

User Program

The user program triggers the transfer of the user data areas through the FC block calls and monitors their execution by evaluating the return values. The execution of the request is confirmed either positively or negatively in the Done/NDR and Error Bit as well as Status Word of the respective block. Based on the outputs of these three parameters, conclusions can be drawn on the connection status.

Note

You will find help and exact explanation of all parameters, interconnections and outputs of the respective blocks in the Online – Help.


Page 17


Communications Structure An ISO-on-TCP conn ect io n b etw een 2 auto mat io n devi ces Station LEFT CPU 1

CP 1 MAC: 08-00-06-01-74-10

Sending and Receiving “ using a TSAP”

TSAP ID

1 FC LSEND

Station RIGHT

Example of a connection

CPU 2

MAC: 08-00-06-01-74-20

TSAP

1 SEND

CP 2

1 DATA

RECEIVE

1

ID

FC LRECV

Acknowledgement ID

1 FC LRECV

1 RECEIVE

1

Acknowledgement

SEND

IP Address:

IP Address:

192.168.0.3

192.168.0.2

SIMATIC S7

Date: File:


Structure

DATA

18.09.2009 PRO3_08E.18

1

ID

FC LSEND


The slide shows a schematic of the complete structure of data transmission using a logical connection between two SIMATIC stations. This connection can be used for reciprocal data exchange (duplex operation). The logical TSAP connection endpoints (local or remote) uniquely characterize a connection channel between two communication partners. The user program assigns the send and receive data to the correct connection block on the CP using the connection ID.


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Task Description: Exchange of Recipe Data WinCC flexible Runti me: R e c i p e__L Sc r een : o w n r ec i pe S cr een : p ar tn er r ec i pe

SIMATIC S7

Date: File:


WinCC flexible Runti me: R e c i p e__R Screen: own recipe Screen: partner recipe

18.09.2009 PRO3_08E.19


Function Up Till Now Up until now, only your own parts data record is created, displayed and transferred into your "own" controller with the operator panel (WinCC-flexible Runtime) in the screen "Recipe". The individual values o f the recipe are also displayed in the Start screen (see slide above). Task

Now the function of the operator panel is to be expanded so that the "Other Recipe" of the partner station is displayed on your operator panel. For this, a recipe view is to be created on the operator panel that displays the "Other Recipe" of the other station (see slide). The two stations are to exchange the current parts data records amongst themselves, that is, the "Own Recipe" sends and the "Other Recipe" receives.

Note

Basically, the OPs could access their own controller andthe controller of the partner station directly and read out the data directly. The task could therefore be solved without the explicit configuration of a communication. For the exercise though, it is to be implemented with an Ethernet connection and then with S7 communication.


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Exercise 1: Configu ring a CP and A ssign ing Parameters to It

SIMATIC S7

Date: File:



18.09.2009 PRO3_08E.20

Task

You are to configure the communications processor of your training unit and assign parameters to it as shown in the slide.

What to Do

1. Integrate the CP in your HW-Config as shown in the slide. You will find the CP in the HW Catalog under SIMATIC 300  CP-300  Industrial Ethernet  CP343-1 2. Parameterize the CP as shown in the slide Make the following arrangements with your partner group: •

the IP addresses of both CPs must begin with 192.168.0. ….., only the last digit must be different, for example: CP LEFT: 192.168.0.3

• •

and

CP RIGHT: 192.168.0.2

the subnet masks of both CPs must be identical: 255.255.255.0 Station LEFT: active connection build up, Station RIGHT not!

3. Save and compile the hardware configuration and download it in your station.


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Exercise 2: Creating/Inserti ng an ISO-on-TCP Connection

Double-click

SIMATIC S7

Date: File:


18.09.2009 PRO3_08E.21


Task

So that you don’t have to load the hardware station of your partner group into your own project, create an ISO-on-TCP connection to a station that is not stored in your project. For this, select "unspecified" station as the connection partner in the Connection dialog.

What to Do

1. In the SIMATIC Manager, start the NETPRO application by double-clicking on any network you like (such as, MPI) 2. Select your CPU as connection-capable module and in the lower window of the Connection Table select an empty line in which you enter the new connection. 3. Double-click on the empty line to get the connection dialog or activate the menu Insert  New Connection..., to insert the required ISO-on-TCP connection. 4. In the dialog that pops up, select your connection partner and the type o f connection.


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Exercise 3: Assi gnin g Parameters to the ISO-on-TCP Connection

SIMATIC S7

Date: File:


What to Do

18.09.2009 PRO3_08E.22


Use the parameters which are shown in the slide. Make sure, that one of the two involved communication partner is responsible for the "Active connection establishment" and the other one not.


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Exercise 4 : Expandi ng t he S7 and Operator Panel Program WinCC flexible Runti me: R e c i p e__L Sc reen : o wn r ec ip e Sc reen : p ar tn er r ec ip e

WinCC flexible Runti me: R e c i p e__L Screen: own recipe Screen: partner recipe

ISO-on-TCP Connection

SIMATIC S7

Date: File:


18.09.2009 PRO3_08E.23


Function Up Till Now With the OP, your own parts data records are transferred directly into the Instance DB "DB_FB-OP" (DB99), that is, into the OUT parameter #Parts_Data of the function block "FB-OP" (FB99) using the screen "Own Recipe". Through this OUT parameter, the current parts data record is then passed on toFB-Line". Task

On both CPUs, the DB99 instance data block of FB99 is to be used as the interface for the exchange of recipes. The OP writes the "Own Recipe" as usual in the variable, that is, the OUT parameter #Parts_Data. The OP reads the "Other Recipe" from the (STAT) variable #Other_Data that is to be newly created in FB99 (and that is also automatically created in the instance DB 99). Each OP still only accesses the DB99 of its "own" CPU, not that of the "other" CPU.

What to Do

Make the following program changes in the S7 programs of both controllers: 1. In FB99, create the new STAT variable #Other_Data (The FB99 program will then be expanded in the following exercise) 2. Update the call of FB99 in OB1 and in the process also regenerate the instance DB99 so that the new STAT variable #Other_Data is also included in the instance DB. 3. In both WinCC flexible projects (LEFT and RIGHT) create the recipe "Other Data" and connect their entries with the components of the STAT variable #Other_Data in the instance DB99 of your own controller. 4. In the screen "Other Recipe", program a recipe view that only allows you to read out the other recipe, not download it.


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Exercise 5: Communication via ISO-on-TCP Connection S t a t i o n

LEFT

S t a t i o n

FB99

FB99

"AG_SEND" (FC 5) ACT

"AG_SEND" (FC 5) ACT

DONE

ID

ERROR

LADDR

STATUS

ISO-on-TCP

SEND LEN

DONE

ID

ERROR

LADDR

STATUS

SEND LEN

"AG_RECV" (FC 6) ID

"AG_RECV" (FC 6)

NDR ERROR

LADDR RECV

ID

Connection

SIMATIC S7

NDR ERROR STATUS LEN

Date: File:


LADDR RECV

STATUS LEN

Task

RIGHT

18.09.2009 PRO3_08E.24


To exchange the parts data records via the ISO-on-TCP connection, the standard blocks "AG_SEND" (FC 5) and "AG_RECV" (FC 6) must now be integrated in the S7 program. The blocks are included in the "SIMATIC_NET_CP"  "CP 300" library.

What to Do

1. Program the calls of the "AG_SEND" (FC 5) and "AG_RECV" (FC 6) standard blocks in FB99. The recipe data is to sent every 100ms via the IN parameter "ACT" of the "AG_SEND" (FC9) block. For this, use the flashing frequency memory bit M10.0. 2. Check the function on the operator panel, that is, with the Runtime of WinCC flexible.


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Industrial Ethernet

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