Connection of the Digital InputsΒΆ
The digital inputs can be used as source inputs or as sink inputs.
Attention
:strong:Risk of malfunctions in the plant!
A ground closure, e. g. caused by a damaged cable insulation, can bridge switches accidentally.
Use sink inputs when possible or make sure that, in case of error, there will be no risks to persons or plant.
The following figure shows the electrical connection of the digital inputs to the PM55x processor modules:
| Electrical connection of digital inputs (sink inputs) | Electrical connection digital inputs (source inputs) |