SIMATIC S7-300. DIGITAL INPUT SM 321. OPTICALLY ISOLATED 16DI. 24 V DC. SOURCE INPUT. 1 X 20 PIN
SIMATIC S7-300. DIGITAL INPUT SM 321. OPTICALLY ISOLATED. 32 DI. 120V AC. 1 X 40 PIN
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. AC/DC 24 - 48V WITH ONE CHANNEL PER COMMON. 1 X 40 PIN