DO820 ABB Ability™ System 800xA® hardware selector

The DO820 is an 8 channel 230 V a.c./d.c. relay (NO) output module

for the S800 I/O. The maximum output voltage is 250 V a.c./d.c. and

the maximum continuous output current is 3 A. Al outputs are

individualy isolated. Each output channel consists of optical

isolation barrier, output state indication LED, relay driver, relay and

EMC protection components. The relay supply voltage supervision,

derived from the 24 V distributed on the ModuleBus, gives an error

signal if the voltage disappears, and the Warning LED turns on. The

error signal can be read through the ModuleBus. This supervision can

be enabled/disabled with a parameter.

Features and benefits

• 8 channels for 230 V a.c./d.c. relay Normal Open (NO) outputs

• 8 isolated channels

• Output status indicators

• OSP sets outputs to predetermined state upon error detection