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