SIEMENS S7-200 CPU MODULE
The first module for the S7-200 series is the CPU module. This is a necessary module, and you will always need at least one of these. A Siemens S7-200 CPU module contains the CPU PLC hardware. This is the module that has your PLC program stored and runs it.
There are several CPU modules for the S7-200 available. Some with digital inputs and outputs only, some with analog inputs and outputs, and some with expansion modules available.
Communication Modules for S7-200
Siemens S7-200 communication with PROFIBUS and AS-Interface.
At last, you can expand the Siemens S7-200 system with PLC communication. You can get network interfaces for ASI bus network, PROFIBUS network and Ethernet network. All the network interface modules have standard connectors for each network protocol. For example, the Ethernet network uses RJ45 connectors for connecting the Ethernet cables. The networking modules also lets you communicate with other Siemens PLC’s like the Siemens LOGO and the S7-300 and 400 PLC’s.
