There are two types of digital input, differentiated by their power source: isolated and non-isolated. Non-isolated inputs are powered by a common source. For example, the wiring diagram shows a ...

Higher amperage relay output modules and an 8-point input simulator module are now available from AutomationDirect for the Click series stackable micro brick PLCs.

Troubleshooting PLC Digital Input Modules, Part 2 If input power is missing, the causes can be such things as blown fuses, broken wiring, or broken connections.