Rockwell Automation 1785-L20C_L40C QUICK START CONTROLNET PLC-5 - Manual (Page 24)

4–4 Troubleshoot the Processor System
Publication 1785-10.7 – October 1997
Indicator Color
À
Probable Cause Recommended Action
and
B
Off Internal diagnostics failed 1. Turn power off, make sure ControlNet
address is not 00, reseat processor, then
power up
A B
power up
2. Clear memory and reload your program
3. Replace EEPROM with new program
4. If still an error, replace the processor
No power Check power supply
Steady
Red Faulted unit Cycle power or reset unit
If fault persists, contact your Allen-Bradley Company,
Inc. representative or distributor
Alternating
Red/Green Self-test No action required
Alternating
Red/Off Incorrect node configuration Check network address and other ControlNet
configuration parameters
Off Channel disabled No action required
or
B
O annel i able
Configure for ControlNet communication or
A B
Steady
Green Normal operation No action required
Flashing
reen O
Temporary errors No action required la in
Green/Off
e orar error
Make sure that ControlNet is properly terminated
The processor’s ControlNet address
is above UMAX Configure the ControlNet network so that UMAX is at
least as high as the processor’s ControlNet address.
Set the processor’s ControlNet address at or below
UMAX.
Flashing
Red/Off Media fault Check media for broken cables, loose connectors,
missing terminators, etc.
e O
No other nodes present on network Add other nodes to the network
Flashing
e reen
Incorrect network configuration Cycle power or reset unit la in
Red/Green
ncorrect net or con i uration
If fault persists, contact your Allen-Bradley Company,
Inc. representative or distributor
À
Definition of terms:
•
alternating— the two indicators alternate between the two defined states at the same time (applies to both indicators viewed together);
the two indicators are always in opposite states, out of phase
•
flashing— the indicator alternates between the two defined states (applies to each indicator viewed independent of the other); if both
indicators are flashing, they flash together, in phase
•
steady— indicator is on continuously in the defined state