| Model | Ordercode | Description | |
| CP 040 | 040-1BA00 | Communication Processor | RS232 interface |
| Protocols ASCII, STX/ETX, 3964(R) and Modbus RTU (master, slave) | |||
| CP 040 | 040-1CA00 | Communication Processor | RS422/485 interface |
| Protocols ASCII, STX/ETX, 3964(R) and Modbus RTU (master, slave) | |||
| CP 042 | 042-1IO00 | Communication Processor | IO-Link master, 4 channels |
| IO-Link ports galvanically isolated from the backplane bus | |||
| Permanent memory for parameter | |||
| Channels be run as standard-I/O (SIO) or in IO-Link mode | |||
| Status-LEDs for SIO-mode, IO-Link mode and for error indication | |||
| Length of process data for input and output of 64 bytes each | |||