Siemens PLC Programming, S7-300 and S7-400 (SIMATIC S5) PLC
![Siemens PLC Programming, S7-300 and S7-400 (SIMATIC S5) PLC](https://plctr.com/wp-content/uploads/Siemens_S7-400-com-250x190.jpg)
Communication Modules Communication modules provide data exchange between PLCs and input-output units or between other personal computers. These modules can be operated by direct connection (point to point) or over a network. In ...
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