Omron CVM1 Series, Operation Manual

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72
Troubleshooting with Status Area Functions Section 5-2
Flag Allocation in Multi-
level Mode
Troubleshooting with
Status Flags
Word
(N = Unit number)
PC Link Error Flags PLC Run Flags
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
1500 + 25
×
N Link
#1 15 14 13 12 11 10 9 8 15 14 13 12 11 10 9 8
1500 + 25
×
N + 1 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
1500 + 25
×
N + 2 Link
#0 15 14 13 12 11 10 9 8 15 14 13 12 11 10 9 8
1500 + 25
×
N + 3 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
Flag status Probable cause Remedy
PLC Run Flag OFF The PC Link Unit’s switch set-
tings are incorrect. Check settings such as the level/link number, node address, and
number of LR bits.
Confirm that the PC Link Unit’s node address is not set on another
node in the PC Link.
Confirm that all of the nodes in the PC Link have the same level/
link number setting.
An error occurred in the PLC
in which the affected Unit is
mounted. Refer to the PLC’s Operating Manual to clear the error.
If the error recurs, replace the PLC.
The PLC is stopped. Switch the PLC to RUN mode.
PC Link Error Flag
ON The PC Link Unit’s switch set-
tings are incorrect. Check settings such as the level/link number, node address, and
number of LR bits.
Confirm that the PC Link Unit’s node address is not set on another
node in the PC Link.
The cable is disconnected or
damaged. Check the connections and the cable itself.
An error occurred in the
affected Unit. Check the affected Unit’s LED Indicators, identify the error using
the table in
5-1 Troubleshooting with LED Indicators , and correct
the error.
A communications error
occurred due to noise. Check the length of the branch lines and main line.
Check the Terminating Resistance switch settings.
Separate the communications cables from power/high voltage
lines.