ABB AO820 System 800xA hardware selector

Features and benefits

• 4 channels of -20 mA .+20 mA, 0 .20 mA, 4 .20 mA or -10 V .+10 V, 0 .10 V, 2 .10 V outputs

• Individualy galvanicaly isolated channels

• OSP sets outputs to predetermined state upon error detection."

The AO820 Analog Output Module has 4 bipolar analog output

channels. The choice of current or voltage output is configurable for

each channel. There are separate sets of terminals for voltage and

current outputs, and it is up to the user to wire outputs properly. The

only differences between current or voltage channel configuration is

in software settings.

To supervise the communication to the A/D-converters the output

data is read back and verified. The opencircuit diagnostics are read

continuously as wel. The process voltage supervision input give

channel error signals if the voltage disappears. The error signal can

be read via the ModuleBus.