Simatic S7-300, module of binary inputs SM 321, 16 inputs/24V DC type sink/source, optical isolation, front connector is necessary 20 pin
Simatic S7-300, module of binary inputs SM 321, 16 inputs/24-48V AC/DC, optical isolation for whole group, needed connection 40 PIN
Simatic S7-300, module of binary inputs SM 321, 16 inputs/24-125V DC, optical isolation, diagnostics on wire interruption, timestamp, front connector is necessary 40 pin...
Simatic S7-300, module of binary inputs SM 321, 16 inputs/24V DC, optical isolation, front connector is necessary 20 pin
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