5-2 Connecting to the Host Using Controller Link
5-23
5-2-3 Troubleshooting Using Indicators
The errors indicated by indicators on the Controller Interface Unit and remedies are ex-
plained in this section.
RUN: Operating
ERC: Communications error
ERH: EEPROM Error
INS: Network participation
LNK: Data link
Indicators
Troubleshooting with RUN, ERC, ERH, and INS Indicators
The RUN, ERC, ERH, and INS indicators can be used to check whether the Controller Link
Interface Unit and network participation are operating normally.
Precautions
for Safe Use
• Always turn OFF the power to the PT before performing any of the following
operations.
• Connecting/Disconnecting a Board or a connector.
• Securing a Board or a connector.
• Setting hardware switches.
Indicators
RUN ERC ERH INS
Probable cause
Remedy
Lit Not lit Not lit Lit The Unit operating normally.
Network participation normal.

Not lit Lit
− −
Controller Link Interface Unit is
faulty.
If ERC indicator lights even after
mounting on another PT, replace the
Controller Link Interface Unit
Not lit Not lit Not lit Not lit Power is not being supplied to
PT normally.
Check the power supply voltage and
supply at the recommended voltage.
The Controller Link Interface
Unit has become loose.
Secure the Controller Link Interface
Unit firmly.
Controller Link Interface Unit is
mounted in the wrong slot.
Refer to 3-8 Installing the Controller
Link Interface Unit, and mount the
Board correctly.
Controller Link Interface Unit is
faulty.
If indicators do not light when the
Board is mounted on another PT, re-
place the Controller Link Interface Unit
Lit Lit
−
Not lit The same node address is be-
ing used in the same network.
Reset so that each node address is
used only once within the same net-
work.
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