Siemens SIMATIC S7 CP340 Betriebsanleitung

http://support.automation.siemens.com/WW/view/en/ID 88867653

FAQ 02/2014

CP340/CP341/CP440/CP441

Communication and

Programming

SIMATIC S7

CP340/CP341/CP440/CP441 Communication and Programming

Entry-ID: 88867653, V1.0, 02/2014

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Table of contents

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1 Overview

CP340/CP341/CP440/CP441 Communication and Programming

Entry-ID: 88867653, V1.0, 02/2014

1 Overview

Siemens SIMATIC S7-series serial communication modules mainly include CP340,

CP341, CP440-1, CP441-1/2, as well as 1SI 3964/ASCII and 1SI MODBUS/USS of

ET200S, etc., and the communication protocols they support mainly include ASCII,

RK512, 3964(R), MODBUS Master, MODBUS Slave and other loadable protocols,

etc. SIMTIC S7-series serial communication modules and their supported

communication protocols are in the corresponding relations shown in the table

below:

ASCII

3964(R)

RK512

MODBUS Master

MODBUS Slave

CP340

CP341

CP440

CP441-1

CP441-2

X: support, -: not support

Table 1: Corresponding relations between modules and protocols

In actual application, the above-stated serial communication modules may be used

to realize serial communication for the following devices:

3rd-party DCS and PLC systems, etc.

3rd-party intelligent device and instrument, etc.

Receiving data from scanner and bar-code reader, etc.

Sending data to serial printer and other receiving devices

All other user-defined protocol devices that support ASCII and MODBUS

This document mainly introduces applications of CP340, CP341, CP440, CP441-1

and CP441-2, as well as ASCII, MODBUS RUT protocols they support, and it also

includes the routine used by each module for reference for readers.

Declaration: The virtual project stated in this document has major difference from

the real project example, and the example is not programmed in accordance with the

specified engineering design flow, and readers shall not confuse it with the real

project example. The example is free of charge, and any user may copy or release it

freely. The author of the program will not assume any liability for any functionality or

compatibility, and users shall assume the related risks. Siemens will not provide error

correction of this program example or hotline support. It is suggested that users

1 Overview

CP340/CP341/CP440/CP441 Communication and Programming

Entry-ID: 88867653, V1.0, 02/2014

should read the related module operation manuals carefully to use them in a better

way.

2 Introduction of related software and its applications

CP340/CP341/CP440/CP441 Communication and Programming

Entry-ID: 88867653, V1.0, 02/2014

2 Introduction of related software and its

applications

2.1 STEP7

STEP7 programming software is used to write PLC program, and it shall be

purchased from Siemens. All procedure codes in this document are written with

STEP7 V5.4 SP4.

2.2 PtP drive software package

PtP Param V5.1 is the drive software package for CP340/CP341/CP440/CP441,

and parameters may only be distributed to the serial communication module and

the function block necessary for communication programming may only be

integrated in STEP7 after this drive software package is installed. This drive will be

provided when the module is purchased, and it may also be downloaded through

the following linkage. The updated software version is PtP Param V5.1 SP11 at

present. http://support.automation.siemens.com/WW/view/en/27013524

2.3 MODBUS Master drive software package

This drive software package shall be installed when CP341 or CP441-2 is used in

MODBUS master, but PtP Param V5.1 drive program software package shall be

installed earlier. This drive software package may be purchased when purchasing

MODBUS Dongle or be downloaded through the following link:

MODBUS Master drive (RTU) software package:

http://support.automation.siemens.com/WW/view/en/27774018

MODBUS Master drive (ASCII) software package:

http://support.automation.siemens.com/WW/view/en/25356060

2.4 MODBUS Slave drive software package

This drive software package shall be installed when CP341 or CP441-2 is used in

MODBUS slave, but PtP Param V5.1 drive program software package shall be

installed earlier. This drive software package may be purchased when purchasing

MODBUS Dongle or be downloaded through the following link:

MODBUS Slave drive (RTU) software package:

http://support.automation.siemens.com/WW/view/en/27774276

MODBUS Slave drive (ASCII) software package:

http://support.automation.siemens.com/WW/view/en/25356060

2.5 ModScan32 / ModSlave

This is software provided by third party and may be downloaded from the Internet.

ModScan32 may be used to emulate MODBUS Master to test its communication

with MODBUS Slave. ModSlave may be used to emulate MODBUS Slave to test

its communication with MODBUS Master.

3 Manual and related application documents

CP340/CP341/CP440/CP441 Communication and Programming

Entry-ID: 88867653, V1.0, 02/2014

3 Manual and related application documents

After all drive programs are installed, user may search for all CP module manuals

from the computer, whose detailed position is "Start-> SIMATIC-> Documentation -

> English”, or they may be found directly from the folder of STEP7 installation

path“… Program files-> Siemens -> Step7 -> S7MANUAL -> S7PtP_Cp”.

Fig. 1: Module manual path diagram

4 ASCII protocol communication

CP340/CP341/CP440/CP441 Communication and Programming

Entry-ID: 88867653, V1.0, 02/2014

4 ASCII protocol communication

The communication mode in ASCII protocol is used to realize serial communication

of user-defined protocol, and it is applicable to communication with the intelligent

instrument, bar-code reader, scanner, and printer, etc. that support serial

communication.

The following examples are used to introduce the ASCII protocol communication of

Siemens serial communication modules CP340, CP341, CP440 and CP441.

4.1 ASCII protocol communication of CP340

4.1.1 Hardware catalog

PS 307

6ES7 307-1EA00-0AA0

CPU 315-2DP

6ES7 315-2AG10-0AB0

MMC

6ES7 953-8LG11-0AA0

CP340

6ES7 340-1AH01-0AE0

4.1.2 Configuration

1. Open STEP 7,and click File->New...to create a new project in name of ptp.

Fig. 2: Dialog box of New project

2. Right-click the project name, select Insert New Object->SIMATIC 300 Station to

change the station name to CP340 ASCII.

4 ASCII protocol communication

CP340/CP341/CP440/CP441 Communication and Programming

Entry-ID: 88867653, V1.0, 02/2014

Fig. 3: Insert S7-300 station

3. Double-click Hardware to enter the hardware configuration interface and insert

RACK, CPU315-2DP and CP340.

Fig. 4: Configuration hardware

4 ASCII protocol communication

CP340/CP341/CP440/CP441 Communication and Programming

Entry-ID: 88867653, V1.0, 02/2014

4. Double-click CP340 module, and click Parameter... to configure CP340

parameters.

Fig. 5: CP340 Properties dialog box

5. Select ASCII from Protocol options.

Fig. 6: Protocol selection

4 ASCII protocol communication

CP340/CP341/CP440/CP441 Communication and Programming

Entry-ID: 88867653, V1.0, 02/2014

6. Double-click the envelop icon under Protocol to configure ASCII communication

parameters. The set communication parameters shall be the same as those of the

communication partner. Communication Baud rate: 9600bps，Data bit: 8 bits,

Stop bit: 1 bit, Parity: none, Character delay time: 4ms, Other parameters shall be

in default settings.

Fig. 7: Distributing communication parameters for ASCII protocol

As shown in the Fig. above, if "Activate BREAK monitoring" is selected, the SF red

indicator of CP340 will be on when RS232C cable is not connected or the serial

port of the communication partner is not activated.

7. If CP340 in RS422/485 interface is selected, the interface properties shall also

be set, as shown below:

Fig. 8: Configuration interface parameters

When the interface is in RS485 type (half-duplex mode), the initial state of the

receive side will be R(A)0V/R(B)5V, and it will not support wire-break detection

function. When the interface is in RS422 type (full-duplex mode) and the initial

state of the receive side is set as R(A)0V/R(B)5V, it will support wire-break

detection function. These 2 states correspond to the following interface pins of the

communication partner receive side:

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