Digital input module
SIMATIC S7-300 Digital Input Module (SM 321) used in Programmable Logic Controller (PLC) systems.
The 6ES7321-1CH00-0AA0 is a digital input module for the Siemens SIMATIC S7-300 Programmable Logic Controller (PLC) system. It allows the PLC to read 16 distinct on/off signals from external devices (like pushbuttons and limit switches) operating on 24V to 48V AC or DC.
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