Description
NEW CONDITION
The Siemens part number
is a digital input module (SM 321) for the SIMATIC S7-300 series of Programmable Logic Controllers (PLCs), designed to interface with AC voltage signals.
This module expands the S7-300 system’s ability to read digital signals from industrial equipment operating on AC power.
- Function: An expansion module that converts external AC digital process signals to the internal logic levels of the controller.
- Input Type: Specifically designed for AC signals, suitable for connecting standard switches and 2- or 3-wire AC proximity switches (BEROs).
- Voltage: The rated input voltage is 120/230 V AC (permissible range of 79 V to 264 V AC).
- Isolation: Features optical isolation between the input channels and the backplane bus to ensure protection from electrical noise and potential differences. The channels are isolated in groups of four.
- Connectivity: Wiring is done using a single 20-pole front connector.
- Status Indicators: Each channel is equipped with a green LED to display its current signal status, aiding in diagnostics and monitoring.
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