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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 |
Notes |
| CP341 |
The loadable drivers Modbus Master (RTU) and Modbus Slave (RTU) can be installed on the serial CP341 with the order 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
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| CP441-2 |
The loadable drivers Modbus Master (RTU) and Modbus Slave (RTU) can be installed on the serial CP441-2 with the order numbers below:
- 6ES7441-2AA03-0AE0
- 6ES7441-2AA04-0AE0
Note
For CP441-2 you need one of the following interface module:
- 6ES7963-1AA00-0AA0 with RS232 interface
- 6ES7963-2AA00-0AA0 with TTY interface
- 6ES7963-3AA00-0AA0 with RS422/RS485 interface
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| 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 order 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
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| 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 order 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
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Table 01
Additional 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 |
Order 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
Additional 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 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 |
Order number |
| ET 200S 1SI |
6ES7138-4DF10-0AB0 |
| 6ES7138-4DF11-0AB0 |
Table 04
Additional information
More information about the serial interface module ET 200S Modbus/USS is available in the manual in Entry ID: 9260793.
Note on security
Caution
The functions and solutions described in this article confine themselves predominantly to the realization of the automation task. Furthermore, please take into account that corresponding protective measures have to be taken in the context of Industrial Security when connecting your equipment to other parts of the plant, the enterprise network or the internet. Further information can be found in Entry ID: 50203404.
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german
