Digital Inputs are not working

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Error Definition

  • When I apply an input on the digital input, the PLC does not seem to detect it.

Components To Be Checked

  • Make sure the cabling and grounding is correct. See the hardware manual of your device for details.
  • Check your power supply. Measure the voltage levels at the Digital Input connector with a measurement device. The supply should be a DC voltage supply between 12/24 V.

Possible Solutions

  • The digital inputs of the PLC accepts voltage levels between 12-24 V DC
  • If you are using a 12 V power supply , it is possible that it cannot provide enough voltage to excite the digital inputs. Replace your voltage supply with a 24V and try applying the input again.