Functions

– 4 channels for -20… +20 mA, 0… .20 mA,

4… .20 mA, -10… +10 V, 0…20 mA, 4…20 mA, -10… +10 V, 0… .10 V, 2… .10 V, -5… +5 V, 0… .5 V, 1… .5 V d.c. Bipolar differential inputs.

– A set of 4 channels isolated from ground.

– 14 bit resolution plus sign.

– Input shunt resistor protected to 30 VDC.

– Inputs can withstand HART communication.

AI820 Analogue Input Module

The AI820 analogue input module has 4 differential www.cniacs.com bipolar current/voltage inputs. Each

channel can be either a voltage or current input.

The current inputs are designed to withstand accidental maximum normal mode 30 VDC connections.

To protect the current input circuits from hazardous input levels (i.e., accidental connection to a 24 V power supply), the 250 Ω current-sense resistor is rated at approximately 5 watts.

This is only used for temporary protection of one channel.

The module distributes external transmitter power to each channel. This adds a simple connection (using the extended MTU) to distribute power to external 2-wire transmitters.

There is no current limit on the transmitter power terminals.