Siemens ST PCS 7 User Manual
Communication
Other communication
Modbus
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Siemens ST PCS 7 · November 2007
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Overview
Modbus is connected to PROFIBUS DP using an ET 200M with
a CP 341 communications processor. The latter enables the fast
and efficient exchange of data through point-to-point coupling.
The CP 341 communications module is available in 3 versions
The CP 341 communications module is available in 3 versions
with different transmission physics:
• RS 232C (V.24)
• 20 mA (TTY)
• RS 422/RS 485 (X.27)
The MODBUS Master or MODBUS Slave loadable drivers are
• RS 232C (V.24)
• 20 mA (TTY)
• RS 422/RS 485 (X.27)
The MODBUS Master or MODBUS Slave loadable drivers are
needed for the Modbus coupling.
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Selection and Ordering Data
Order No.
CP 341 communications
processor
processor
with one RS 232 C (V.24) interface
6ES7 341-1AH01-0AE0
RS 232 connecting cable
for linking to SIMATIC S7
• 5 m
• 5 m
6ES7 902-1AB00-0AA0
• 10 m
6ES7 902-1AC00-0AA0
• 15 m
6ES7 902-1AD00-0AA0
CP 341 communications
processor
processor
with one 20 mA (TTY) interface
6ES7 341-1BH01-0AE0
20 mA (TTY) connecting cable
for linking to SIMATIC S7
• 5 m
• 5 m
6ES7 902-2AB00-0AA0
• 10 m
6ES7 902-2AC00-0AA0
• 50 m
6ES7 902-2AG00-0AA0
CP 341 communications
processor
processor
with one RS 422/485 (X.27)
interface
6ES7 341-1CH01-0AE0
RS 422/485 connecting cable
for linking to SIMATIC S7
• 5 m
• 5 m
6ES7 902-3AB00-0AA0
• 10 m
6ES7 902-3AC00-0AA0
• 50 m
6ES7 902-3AG00-0AA0
Loadable drivers for CP 341
MODBUS master (RTU format)
• Single license
• Single license
6ES7 870-1AA01-0YA0
• Single license, without software
or documentation
6ES7 870-1AA01-0YA1
MODBUS slave (RTU format)
• Single license
• Single license
6ES7 870-1AB01-0YA0
• Single license, without software
or documentation
6ES7 870-1AB01-0YA1
© Siemens AG 2007