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C200H I/O Link Units Section 6-1
Indicators The indicators display the status of the C200H I/O Link Unit and the Network.
When the Network is operating normally, the 7-segment display shows the
C200H I/O Link Unit’s node address; when an error has occurred, it shows an
error code and the faulty node’s node address.
Seven-Segment Display
In addition to the MS and NS indicators, a C200H I/O Link Unit has a 2-digit,
7-segment display that normally displays the C200H I/O Link Unit’s node
address. When an error occurs, the display will alternate between the error
code and the node address of the faulty Slave. The dots at the lower-right of
each digit indicate the Read/Write Area setting status (default/user settings).
Indi-
cator
Color Status Definition Meaning
MS Green ON Device Operational Normal operating status.
Flashing Device in Standby Reading switch settings.
Red ON Unrecoverable Fault Unit hardware error: Watchdog timer error.
Flashing Minor Fault Switch settings incorrect, etc.
--- OFF No Power CPU Unit error, power isn’t being supplied, waiting for initial pro-
cessing to start, or the Unit is being reset.
NS Green ON Link OK.
On-line, Connected.
Network is operating normally (communications established)
Flashing On-line, Not Connected Network is operating normally, but communications have not yet
been established.
Red ON Critical Link Failure A fatal communications error has occurred. Network communica-
tions are not possible. Check for a node address duplication or Bus
Off error.
Flashing Connection Time-out Communications timeout.
--- OFF Not Powered/
Not On-Line
Checking for node address duplication on the Master, switch set-
tings are incorrect, or the power supply is OFF.
Status Display
Error Watchdog timer Not lit
Memory or system
error
Error code only Lit
Other errors Error code and error node address alternate
(see diagram below)
Normal: C200H I/O Link Unit's node address
Error: Error code and C200H I/O Link Unit's node address
Read/Write Area: Default/user settings
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