ProSoft Technology MVI56E-GSC/ GSCXT - Manual (Page 53)

MVI56E-GSC ♦ CompactLogix or MicroLogix Platform MVI56E-GSC Configuration
Enhanced Generic ASCII Serial Communication Module User Manual
ProSoft Technology, Inc. Page 53 of 140
May 9, 2014
A "backplane communication failure" is any failed attempt by the module to
communicate with the ControlLogix processor. For local rack applications, where
the module is installed in the same chassis as the processor, backplane failures
can occur due to a hardware problem or Input/Output (I/O) configuration problem.
For remote rack applications, where the module is installed in a different chassis
from the processor and linked by communication adapters, such as ControlNet or
EtherNet/IP, in addition to hardware and I/O configuration problems, any failure
to communicate with the ControlLogix processor across a process network will
be considered a backplane communication failure.
The GSC.UTIL.B ACKPLANE F AIL parameter specifies the number of successive
ControlLogix backplane transfer failures that must occur before the ASCII serial
communication ports are shut down. If the parameter is set to zero, the
communication ports will continue to operate under even if the module has no
communication with the processor. If the value is set greater than 0 (1 to 65535),
serial port communication will cease if the specified number of successive
communication failures occur.
The only ways to restart serial port communication after a Backplane Fail
shutdown are by Cold Boot from ladder logic, by removing and then reinserting
the module in the chassis, or by turning power to the module or chassis off and
then back on (Cold Start).