SIMATIC S7-300. DIGITAL MODULE SM 323. OPTICALLY ISOLATED. 8 DI AND 8 DO. 24V DC. 0.5A AGGREGATE CURRENT 2A. 1X20 PIN
SIMATIC S7-300. DIGITAL INPUT SM 321. OPTICALLY ISOLATED. 8 DI. 120V/230V AC. 1 X 20 PIN
SIMATIC S7/PCS 7. SM 321 DIGITAL INPUT. 16 DI. DC 24/125V. 1 X 40-PIN FRONT CONNECTOR WITH WIRE BREAK DIAGNOSIS HARDWARE INTERRUPT DIAGNOSTICS
SIMATIC S7-300. DIGITAL INPUT SM 321. OPTICALLY ISOLATED. 16 DI. AC/DC 24 - 48V WITH ONE CHANNEL PER COMMON. 1 X 40 PIN