Omron CVM1 Series, Operation Manual

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Troubleshooting with LED Indicators Section 5-1
5-1 Troubleshooting with LED Indicators
LED Indicators
The LED Indicators on the front of the PC Link Unit indicate when an error has
occurred.
• Display
Note A node address setting error will occur when the node address is not in the
allowed setting range (0 to 31 for single-level operation or 0 to 15 for multi-
level operation).
A node address setting error will
not occur if the same node address is set on
two PC Link Units, but there will be data errors in the LR Area. Be sure to set
a unique address on each Unit.
Name Color Status Unit status
RUN
(Run)
Green Lit The Unit is operating normally. (Lit after initial-
ization is completed.)
Not lit Unit error
ERC
(Communica-
tions error)
Red Lit A hardware error or node address setting error
occurred. (See note.)
Flashing A link error occurred with the polling node link,
Local Unit link, or Other Unit link.
Not lit The Unit is communicating normally.
ERH
(PLC error)
Red Lit An error occurred in the PLC, such as a CPU
Unit error, PLC interface error, EEPROM error,
unit number setting error, or I/O table setting
error.
Not lit There are no errors in the CPU Unit.
LINK0
(Node 0/Polling
node link)
Yellow Lit Normal status, link established with Node 0
(polling node)
Not lit Error status, link not established with Node 0
(polling node)
THIS
(Local Unit link)
Yellow Lit Normal status, link established with local Unit
Not lit Error status, link not established with local Unit
OTHER
(Other Unit link)
Yellow Lit Normal status, link established with other Unit
Not lit Error status, link not established with other Unit
LK401
RUN
ERH
THIS
LINK0
ERC
OTHER