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SM321 dig_in 16x24VDC
Part No: AUTW 321-1BH01
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6ES7 321-1BH00, 6ES7 321-1BH01, 6ES7 321-1BH02 alternative
SM321, DI 16x24VDC potential isolated.

pin-compatible front connector with Siemens 6ES7 321-1BH00 , 6ES7 321-1BH01 , 6ES7 321-1BHxx. More info

Don't forget a 16pnt front connector!
(Search Tags) S7300, S7-300, 300V, 6es7321, 6es7-321