Rockwell Automation 1785-BCM_BEM, D17856.5.4 PLC-5 Backup Communication Module User Manual - Manual (Page 112)

= on = off
Diagnosing Faults
Chapter 8
8-2
Primary (PRI) and Secondary (SEC) LED Indicators
Table 8.B lists the possible states of the PRI and SEC LEDs and provides
the recommended actions to take in case of a fault.
Table 8.B
PRI and SEC LED Indicators
If this LED is: Description Recommended Action
PRI
SEC
the 1785-BCM module is in primary mode
(normal operation) no action required
PRI
SEC
the 1785-BCM module is in secondary mode
(normal operation) no action required
PRI
SEC
the module is without power
(refer to other LEDs on the module)
hardware failure
(see FLT LEDs)
If all LEDs are off, the module is not receiving
any power. Remove the module and reinstall it
into the I/O chassis. Turn on the power.
If the FLT LED is lit, the module has internal
hardware failure. Cycle power to the I/O chassis;
if the failure condition persists, replace the
1785-BCM module.
PRI
SEC
power turn on hardware failure
(refer to other LEDs) At power turn on, all the LEDs light until,
one-by-one they assume their normal state. If
the LEDs light during operation, a hardware
failure exists. Cycle power to the I/O chassis; if
the failure condition persists, replace the
1785-BCM module.
LEGEND:
Backplane (BPLN), Serial (SER), and Fault (FLT) LED Indicators
Table 8.C lists the possible states of the BPLN, SER, and FLT LEDs, and
provides the recommended actions to take in case of a fault.
ATTENTION: When all secondary 1785-BCM module status
indicators are blinking, except the FLT indicator, there is a
switch-setting error. Check that switch assemblies SW1 and
SW2 switches are set in the same positions on both the primary
and secondary modules.