ABB AI820 3BSE008544R1 Analog Input Module

The AI820 Differential Analog Input Module has 4 differential, bipolar current/voltage inputs. This module is suitable for applications requiring high common mode rejection ratings, and/or bipolar voltage or current inputs. Nominal input ranges are: -20...+20 mA, 0(4)...+20 mA, -10...+10 V, 0(2)...+10 V, -5...+5 V and 0(1)...+5 V. The current input is able to handle a short circuit to the transmitter supply without damage. The input withstand HART communication.
The AI820 Analog Input Module has 4 differential, bipolar current/voltage inputs. Each channel can be either a voltage or current input. The current inputs can withstand an accidental maximum normal mode 30 V d.c. connection. To protect the current input circuit against dangerous input levels, that is, by accidentally connecting a 24 V source, the resistor rating of the 250Ω current sense resistors is about 5 Watts. This is intended only to temporarily protect one channel at a time. The module distributes the external transmitter supply to each channel. This adds a simple connection (with extended MTUs) to distribute the supply to external 2 wire transmitters. There is no current limiting on the transmitter power terminals.