233
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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