SIMATIC S7-300. DIGITAL INPUT SM 321. OPTICALLY ISOLATED. 16 DI. AC/DC 24 - 48V WITH ONE CHANNEL PER COMMON. 1 X 40 PIN
SIMATIC S7-300. DIGITAL INPUT SM 321. OPTICALLY ISOLATED. 8 DI. 120V/230V AC. 1 X 40 PIN. WITH 1 POINT PER COMMON
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. OPTICALLY ISOLATED. 16 DI. DC 48-125V. 1 X 20 PIN