Omron SMARTSLICE - 04-2008 Operation Manual page 88

LED Indicators and Error Processing
Unit LED
name
DeviceNet NS
Communica-
tions Unit,
continued
Color Status
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
---
If the problem occurs only in a particular
Slave, check the baud rate and restart the
Slave.
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 6-2
Likely cause of error
69