Siemens 6ES7321-1FF01-0AA0 Digital Input Module

Product manual:

Main technical specifications:
Number of input channels: 8 digital inputs
Input current: 1.5 mA (per channel, typical value)
Input delay: 20 ms (can be used to filter signal jitter)
Isolation voltage: 250 V (between input and backplane bus)
Functional features:
High voltage input:
This module supports 120V and 230V AC voltage inputs, suitable for handling higher input voltages in industrial environments.
LED status indication:
Each input channel is equipped with LED indicator lights to display signal status for easy debugging and monitoring.
Insulation design:
Electrical isolation is used between the input channel and the backplane bus to ensure the safety and stability of signal acquisition.
Diagnostic function:
The module supports diagnostic functions, which can detect the status of input signals and avoid the impact of faults on the system.
Suitable for AC signal acquisition:
Due to its high voltage input capability, it is suitable for scenarios that receive AC signals, such as switch and valve control signals.

Product details picture:

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