Connection of active-type analog sensors (current) with electrically \ isolated power supply and series-connection of an additional input

The following figure shows the connection of active-type analog sensors (current) with electrically isolated power supply and series-connection of an additional input.

Connection of active-type analog sensors (current) with electrically isolated power supply and series-connection of an additional input. 1 analog sensor requires 1 channel.

Note

If series-connection of an additional input is used, it must be kept in mind that the input resistance of the AI531 (ca. 330 Ω) must be added to the input resistance of the second device. Make sure that the maximum permitted load resistance of the analog sensor is not exceeded (see the data sheet of the analog sensor).

Note

The input of the AI531 is not related to ZP. If the input of the second device is related to ZP, the order of sequence in the series-connection must be observed by all means (from the sensor to the AI531 and then to the input of the second device).

The following measuring ranges can be configured AI531 Analog Input Module AI531 Analog Input Module:

Current	-20 … 20 mA	1 channel used
Current	0 … 20 mA	1 channel used
Current	4 … 20 mA	1 channel used

The function of the LEDs is described under Diagnosis and displays / displays AI531 Analog Input Module.

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