SIMATIC S7-300. DIGITAL INPUT SM 321. OPTICALLY ISOLATED 32DI. 24 V DC. 1 X 40 PIN
SIMATIC S7. DIGITAL INPUT SM 321. OPTICALLY ISOLATED. 4 DI. 24V DC. NAMUR/DIN 19234. F. SIGNALS F HAZARDOUS AREAS. CAPABLE OF DIAGNOST..PTB-TESTED
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. GALVANICALLY ISOLATED. 16DI. 24 V DC. 1 X 20 PIN. 0.05 MS INPUT DELAY