The CP 443-5 Basic communications processor is the module required for SIMATIC S7-400 for the PROFIBUS bus system.

It offloads communication tasks from the CPU.

Communications options of the S7-400 through communications modules:

• FMS communication with PROFIBUS 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.