SIMATIC S7-300. DIGITAL INPUT SM 321. OPTICALLY ISOLATED 16 DI. 120/230V AC. 1 X 20 PIN
SIMATIC S7-300. DIGITAL INPUT SM 321. GALVANICALLY ISOLATED. 16DI. 24 V DC. 1 X 20 PIN. 0.05 MS INPUT DELAY
SIMATIC S7-300. DIGITAL MODULE SM 323. OPTICALLY ISOLATED. 16 DI AND 16 DO. 24V DC. 0.5A. AGGREGATE CURRENT 4A. 1X40 PIN
SIMATIC S7-300. DIGITAL INPUT SM 321. OPTICALLY ISOLATED. 16 DI. DC 48-125V. 1 X 20 PIN