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> S7-300 SM321 plc 16 point dc input 6ES7 321-1BH02-0AA0
S7-300 SM321 plc 16 point dc input 6ES7 321-1BH02-0AA0
* For connecting standard switches and two-wire proximity switches (BERO
Digital input modules can be used to connect the PLC to digital process signals. They are suitable for connecting standard switches and two-wire proximity switches (BERO
Digital input modules are characterized by the following mechanical features:
The rugged plastic housing contains:
* Green LEDs to indicate signal states at the inputs
* Slot for front connector, protected by a front cover
* Labeling area on the front cover.
There are no slot rules; the addresses of the inputs are predetermined by the slot.
When they are used in the ET 200M in combination with active bus modules, hot-swapping is possible.
Digital input modules convert the levels of the external digital signals from the process into the internal signal level of the PLC
