The CP 343-5 communications processor is the module required for SIMATIC S7-300 and SIMATIC C7 for the PROFIBUS bus system.

It offloads communication tasks from the CPU.

S7-300 communication options using communication modules:

• FMS communication with PROFIBUS FMS stations through PROFIBUS
• Communication with programming devices, human machine interface devices
• Communication with other SIMATIC S7 systems
• Communication with SIMATIC S5 PLCs
• The number of CPs that can be operated depends on the performance range of the CPU and the communication services used.