Connection of passive-type analog sensors (current) to the analog inputs

The following figure shows the connection of passive-type analog sensors (current) to the analog input AI0. Proceed with the analog inputs AI1 to AI3 in the same way.

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The following measuring ranges can be configured CI541-DP CI541-DP :

Current 4…20 mA 1 channel used

The function of the LEDs is described under Diagnosis and displays / Displays CI541-DP.

Caution

:strong:Risk of overloading the analog input!

If an analog current sensor supplies more than 25 mA for more than 1 second during initialization, this input is switched off by the module (input protection).

Use only sensors with fast initialization or without current peaks higher than 25 mA. If not possible, connect a 10-volt zener diode in parallel to AIx+ and ZP.

Unused input channels can be left open-circuited, because they are of low resistance.

To avoid error messages through unused analog input channels in measuring range 4…20 mA, these channels should be configured as “Not used”.