Connection of passive-type analog sensors (current)

The following figure shows the connection of passive-type analog sensors (current).

1 analog input requires 1 channel

The following measuring ranges can be configured Analog Input/Output Module AX522 Analog Input/Output Module AX522 :

Current

4…20 mA

1 channel used

The function of the LEDs is described under Displays Analog Input/Output Module AX522.

Caution

If, during initialization, an analog current sensor supplies more than 25 mA for more than 1 second into an analog input, this input is switched off by the module (input protection). In such cases, it is recommended, to protect the analog input by a 10-volt zener diode (in parallel to I+ and I-). But, in general, it is a better solution to prefer sensors with fast initialization or without current peaks higher than 25 mA.

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