Led Indicators And Error Processing - Omron GRT1 - 11-2007 Operation Manual

LED Indicators and Error Processing

9-2 LED Indicators and Error Processing
Unit LED
name
Communica- MS
tions Unit
(DeviceNet
Communica-
tions Unit indi-
cators shown)
NS
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.
Color Status
Green Unit operating normally.
MS
--- Power is not being supplied to
MS
the Unit.
Red Unit hardware failure
MS
Red Parameter data is invalid.
MS
Backup data is invalid.
Registration table data is
invalid.
Green DeviceNet communications
NS
are normal.
--- Waiting for completion of node
NS
address duplication check.
Red There is a node address
duplication error at another
Unit in the DeviceNet network.
DeviceNet communications
stopped because of too many
data errors.
NS
Red DeviceNet communications
timeout occurred.
NS
Green Online with DeviceNet, but
waiting for a connection with
NS
the Master.
Meaning
---
Check whether power is being supplied by
the Unit power supply.
Turn the power OFF and then ON again.
Replace the Unit if the error recurs.
Use a Programming Device to write the cor-
rect data again.
Backup the data again.
Register the I/O configuration table again.
---
If the problem occurs only in a particular
Unit, check the baud rate and restart the
Unit.
Set the node addresses again to eliminate
the duplication, and restart the Slice I/O Ter-
minal.
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?
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?
Check whether the Master has started
properly.
Check whether the Slice I/O Terminal is reg-
istered in the Master's scan list.
Section 9-2
Likely cause of error
283