Use of analog inputs as digital inputs

Several (or all) analog inputs can be configured as digital inputs CI501-PNIO. The inputs are not electrically isolated against the other analog channels.

The following figure shows the connection of digital sensors to the analog input AI0. Proceed with the analog inputs AI1 to AI3 in the same way.

Use of analog inputs as digital inputs

The following measuring ranges can be configured CI501-PNIO CI501-PNIO :

Digital input	24 V	1 channel used
Effect of incorrect input terminal connection		Wrong or no signal detected, no damage up to 35 V

The function of the LEDs is described under Diagnosis and displays / Displays CI501-PNIO.