Omron SYSMAC CVM1 Series Operation Manual page 85

Troubleshooting with LED Indicators
Indicator status
RUN ERC ERH LINK0 THIS OTHER
Lit Not lit --- Lit
Lit Not lit --- Not lit Not lit Not lit
Lit Lit Not lit Not lit Not lit Not lit
Lit Lit --- Not lit Not lit Not lit
Lit Flash- --- Lit
ing
70
Probable cause
Lit Not lit Local node is the polling node
(node 0):
Cables are disconnected or con-
nected incorrectly.
Local node is the polling node
(node 0):
There are no other nodes in the
PC Link.
The PC Link Unit is set incorrectly. Check whether there is another node
Local node is a polled node:
Cables are disconnected or con-
nected incorrectly.
Local node is a polled node:
There are no other nodes in the
PC Link.
The PC Link Unit is set incorrectly. Check whether there is another node
The PC Link Unit is faulty or an
error occurred in the PC Link Unit
so that it can't communicate prop-
erly.
The node address is set outside of
the allowed range.
Lit Not lit A polled node's (another node's)
cables are disconnected or con-
nected incorrectly.
An error occurred in communica-
tions with a polled node (another
node).
Power is not being supplied prop-
erly to the CPU Unit of a polled
node (another node).
The PC Link Unit is set incorrectly. Check whether there is another node
Section 5-1
Remedy
Check the Terminating Resistance
switch setting.
Check the cable connections and fix
or replace the cable if necessary.
Set up the network with at least two
functioning nodes.
in the PC Link with the same node
address.
Check whether the level/link number
setting is correct.
Check the Terminating Resistance
switch setting.
Check the cable connections and fix
or replace the cable if necessary.
Set up the network with at least two
functioning nodes.
in the PC Link with the same node
address.
Check whether the level/link number
setting is correct.
Mount the Unit in another CPU Rack
and replace the Unit if the Error
recurs.
Set the node address within the fol-
lowing ranges.
Single-level: 00 to 31
Multi-level: 00 to 15
Check the Terminating Resistance
switch setting.
Check the cable connections and fix
or replace the cable if necessary.
If noise is causing errors, check and
correct the operating environment.
Separate the communications cables
from power/high voltage lines.
Check the power supply voltage and
supply the proper power.
in the PC Link with the same node
address.
Check whether the level/link number
setting is correct.