Siemens SIMATIC S7-400 PLC Panel overview

Here is an introduction to modules of a typical Siemens S7-400 PLC panel.
The panel consists of following modules.
Power supply PS 407
PLC CPU 416 3dp
Memory card
Scalance ethernet switch X204 2
Communication processor
Digital input module
Digital output module
Analog input module
Analog output module
Interface module

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