SIMATIC S7-300. DIGITAL INPUT SM 321. OPTICALLY ISOLATED. 8 DI. 120V/230V AC. 1 X 20 PIN
SIMATIC S7-300. DIGITAL INPUT SM 321. GALVANICALLY ISOLATED. 16 DI. DC 24V. 1 X 20 PIN. PROCESS INTERRUPT. DIAGNOSTICS. FIT FOR ISOCHRONE MODE
SIMATIC S7-300. DIGITAL INPUT SM 321. OPTICALLY ISOLATED. 16DI. 24 V DC. 1 X 20 PIN
SIMATIC S7-300. DIGITAL INPUT SM 321. OPTICALLY ISOLATED. 16 DI. DC 48-125V. 1 X 20 PIN