SIMATIC S7-300, DIGITAL INPUT SM 321, ISOLATED, 16 DI; DC 24V, 1 X 20 PIN, hardware interrupt DIAGNOSTICS, FIT FOR ISOCHRONE. - 6ES7321-7BH01-0AB0 - Siemens
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SIMATIC S7-300, DIGITAL INPUT SM 321, ISOLATED, 16 DI; DC 24V, 1 X 20 PIN, hardware interrupt DIAGNOSTICS, FIT FOR ISOCHRONE. - Siemens