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SM221 DI 8 NPN Convert
Part No: AW 221-1BF50Conv
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These converters are used to plug onto a 8 x 24VDC digital input module 221-1BF00 or 221-1BF01 to allow for NPN inputs.
These converters use the standard VIPA front connectors, so you can remove the existing connector, plug this converter onto the 221-1BF00/01 and plug into the back of the converter with the original VIPA front connector.

24VDC NPN inputs are then available.
Pullup voltage with 3mA source current is provided.
A zero, or M or (0) input causes the input module to trigger a 1 to the PLC.