Simatic S7-300, module of binary inputs SM 321, 16 inputs/24V DC, optical isolation, front connector is necessary 20 pin
Simatic S7-300, module of binary inputs SM 322, 8 relay outputs, 24V DC/2A or 230V AC/2A, optical isolation, front connector is necessary 20 pin...
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, 8 inputs/120/230V AC, optical isolation, needed connection 20 PIN
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