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LED Indicators and Error Processing Section 9-2
9-2 LED Indicators and Error Processing
The following table shows the meaning of the LED indicators on each Unit
used in a Slice I/O Terminal, as well as error processing required when an
error is indicated.
Unit LED
name
Color Status Meaning Likely cause of error
Communica-
tions Unit
(DeviceNet
Communica-
tions Unit indi-
cators shown)
MS Green Unit operating normally. ---
--- Power is not being supplied to
the Unit.
Check whether power is being supplied by
the Unit power supply.
Red Unit hardware failure Turn the power OFF and then ON again.
Replace the Unit if the error recurs.
Red Parameter data is invalid. Use a Programming Device to write the cor-
rect data again.
Backup data is invalid. Backup the data again.
Registration table data is
invalid.
Register the I/O configuration table again.
NS Green DeviceNet communications
are normal.
---
--- Waiting for completion of
node address duplication
check.
If the problem occurs only in a particular
Unit, check the baud rate and restart the
Unit.
Red There is a node address
duplication error at another
Unit in the DeviceNet network.
Set the node addresses again to eliminate
the duplication, and restart the Slice I/O
Terminal.
DeviceNet communications
stopped because of too many
data errors.
Check the following items and restart the
Slice I/O Terminal.
• Is the baud rate the same as the Master’s?
• Are lengths of cables (trunk and branch
lines) correct?
• Are cables short-circuited, broken, or
loose?
• Is terminating resistance connected to
both ends of the trunk line only?
• Is noise interference excessive?
Red DeviceNet communications
timeout occurred.
Check the following items.
• Is the baud rate the same as the Master’s?
• Are lengths of cables (trunk and branch
lines) correct?
• Are cables short-circuited, broken, or
loose?
• Is terminating resistance connected to
both ends of the trunk line only?
• Is noise interference excessive?
Green Online with DeviceNet, but
waiting for a connection with
the Master.
Check whether the Master has started prop-
erly.
Check whether the Slice I/O Terminal is
registered in the Master’s scan list.
MS
MS
MS
MS
NS
NS
NS
NS
NS
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