Hardware reference guide

I/O Modules
560
35013379 02 October 2007
During normal operation, the front panel Active and 1 ... 4 green LEDs are ON. If bus
communication to the module stops for any reason, the Active LED will go off and,
depending on panel software configuration:
z when LEDs 1 ... 4 are ON, the channel output levels will be as predetermined and
held by the module.
z when LEDs 1 ... 4 are OFF, the master override levels are output on each
channel.
If module power is lost or the module fails, the master override levels will be output.
The master override inputs must be from an external supply with a source
impedance of <200Ω or tied to system common. These inputs for channels that are
in use should not be allowed to float and may be unique for each.
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com