Entry type: FAQ, Entry ID: 58386780, Entry date: 06/05/2014
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Which hardware and software components do you need to establish communication between SIMATIC S7 stations and third-party devices using the MODBUS RTU protocol?

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Description
This entry shows you which hardware and software components you need to establish communication between SIMATIC S7 stations and third-party devices using the MODBUS RTU protocol. The SIMATIC S7 stations below can be used as Modbus Master (RTU) and Modbus Slave (RTU):

SIMATIC S7-300, ET 200M or S7-400
SIMATIC S7-300, ET 200M and S7-400 can be used as Modbus Master (RTU) or as Modbus Slave (RTU).

S7-300, ET 200M and S7-400 you need the hardware and software components below to connect a third-party device and establish communication with the MODBUS RTU protocol:

  •  A serial CP
    • CP341 for S7-300 and ET 200M
    • CP441-2 for S7-400
  •  The relevant loadable driver

The table below gives an overview of the hardware and software components.
 

Hardware and software components Note
CP341 The loadable drivers Modbus Master (RTU) and Modbus Slave (RTU) can be installed on the serial CP341 with the article numbers below:
  • 6ES7341-1AH00-0AE0
  • 6ES7341-1AH01-0AE0
  • 6ES7341-1AH02-0AE0
  • 6ES7341-1BH00-0AE0
  • 6ES7341-1BH01-0AE0
  • 6ES7341-1BH02-0AE0
  • 6ES7341-1CH00-0AE0
  • 6ES7341-1CH01-0AE0
  • 6ES7341-1CH02-0AE0
CP441-2 The loadable drivers Modbus Master (RTU) and Modbus Slave (RTU) can be installed on the serial CP441-2 with the article numbers below:
  • 6ES7441-2AA03-0AE0
  • 6ES7441-2AA04-0AE0
  • 6ES7441-2AA05-0AE0

Note
For the CP441-2 you also need the corresponding interface module:

  • 6ES7963-1AA00-0AA0 with RS232 interface
  • 6ES7963-2AA00-0AA0 with TTY interface
  • 6ES7963-3AA00-0AA0 with RS422/RS485 interface
Loadable driver Modbus Master (RTU) The loadable driver Modbus Master (RTU) for CP341 and CP441-2 is available for downloading in Entry ID: 27774018.
The license for the loadable driver Modbus Master (RTU) is available under the article numbers below:
  • 6ES7870-1AA01-0YA0: the license delivery package includes the software, documentation and hardware dongle
  • 6ES7870-1AA01-0YA1: the license delivery package includes only the hardware dongle
Loadable driver Modbus Slave (RTU) The loadable driver Modbus Slave (RTU) for CP341 and CP441-2 is available for downloading in Entry ID: 27774276.
The license for the loadable driver Modbus Slave (RTU) is available under the article numbers below:
  • 6ES7870-1AB01-0YA0: the license delivery package includes the software, documentation and hardware dongle
  • 6ES7870-1AB01-0YA1: the license delivery package includes only the hardware dongle
Table 01

Further Information

  • More information about commissioning the loadable drivers Modbus Master (RTU) and Modbus Slave (RTU) is available in the manuals below.
Manual Entry ID
SIMATIC S7-300/S7-400 Loadable Drivers for PtP CPs: MODBUS Protocol RTU Format, S7 is Master 1220184
SIMATIC S7-300/S7-400 Loadable Drivers for PtP CPs: MODBUS Protocol RTU Format, S7 is Slave 1218007
Table 02
  • How to download a loadable driver such as Modbus Master (RTU) into a CP341 that is connected to an S7-400 H system by means of an ET 200M is described in Entry ID: 17854293.

SIMATIC S7-1200
The SIMATIC S7-1200 station can be used as Modbus Master (RTU) or Modbus Slave (RTU).

In the S7-1200 you need one of the following communication modules to connect a third-party device and establish communication with the MODBUS RTU protocol.
 

Communications module Article number
CM 1241 RS422/485 6ES7241-1CH31-0XB0
CM 1241 RS485 6ES7241-1CH30-0XB0
CB 1241 RS485 6ES7241-1CH30-1XB0
CM 1241 RS232 6ES7241-1AH30-0XB0
Table 03

Further Information

  • More information about communication using the MODBUS RTU protocol is available in the manual in Entry ID: 36932465.
  • A sample program for establishing MODBUS-RTU communication for SIMATIC S7-1200 is available in Entry ID: 47756141.

SIMATIC S7-1500, SIMATIC ET 200MP, SIMATIC ET 200SP
The SIMATIC S7-1500 station can be used as Modbus Master (RTU) or Modbus Slave (RTU).

In the S7-1500 you need one of the following communication modules to connect a third-party device and establish communication with the MODBUS RTU protocol.
 

Communications module Article number
CM PtP RS232 HF (for S7-1500 and ET 200MP) 6ES7541-1AD00-0AB0
CM PtP RS422/485 HF (for S7-1500 and ET 200MP) 6ES7541-1AB00-0AB0
CM PtP (for ET 200SP) 6ES7137-6AA00-0BA0
Table 04  

Additional Information

  • More information about communication using the MODBUS RTU protocol with the S7-1500, the ET 200MP and the ET 200SP is available in the manual in Entry ID 59057093.
  • A sample program for establishing MODBUS-RTU communication for SIMATIC S7-1500 is available in Entry ID 68202723.

SIMATIC ET 200S
The SIMATIC ET 200S can be used as Modbus Master (RTU) or as Modbus Slave (RTU).

In the ET 200S you need a serial interface module ET 200S Modbus/USS to connect a third-party device and establish communication with the MODBUS RTU protocol.
 

Serial interface module Article number
ET 200S 1SI 6ES7138-4DF10-0AB0
6ES7138-4DF11-0AB0
Table 05

Further Information
More information about the serial interface module ET 200S Modbus/USS is available in the manual in Entry ID: 9260793.

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