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Troubleshooting Using Indicators Section 9-1
9-1 Troubleshooting Using Indicators
This section describes the errors indicated by the Controller Link Unit indica-
tors and possible remedies.
9-1-1 CS/CJ-series Controller Link Units
Troubleshooting with RUN, ERC, ERH and INS Indicators
The RUN, ERC, ERH, and INS indicators can be used to check whether Con-
troller Link Unit startup and Network participation are operating normally.
Note Be sure to turn off the power to the PLC before performing any of the follow-
ing.
• Disconnecting the Unit or connectors.
• Securing Units or connectors.
• Setting hardware switches.
RUN: Operating
ERC: Communications error
ERH: PLC error
INS: Network participation
LNK: Data link
M/A: Data link mode
TER: Terminating resistance
CS-series Unit
CJ-series Unit
RUN
ERC
INS
SD
RD
M/A
LNK
ERH
CLK21-V1
TER
RUN
CLK21-V1
ERC INS
ERH M/A LNK RDTER
SD
Indicators Probable cause Probable remedy
RUN ERC ERH INS
Lit Not lit Not lit Lit Unit operating normally;
Network participation nor-
mal.
---
Not lit Lit --- --- Node address is set out of
range.
Set the node addresses to
between 1 and 32.
Controller Link Unit faulty. If the ERC indicators still
lights when the Unit is
mounted on another PLC,
replace the Controller Link
Unit.
Wired Network 62 Node
Enable Bit is set incor-
rectly.
Turn ON the Wired Net-
work 62 Node Enable Bit
and turn the power supply
OFF and ON.