Omron CRT1 - 10-2008, Operation Manual

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Indicator Meanings and Troubleshooting Section 12-1
12-1 Indicator Meanings and Troubleshooting
MS and NS
indicators
Meaning Remarks
Lit green
Remote I/O communi-
cations or message
communications are in
progress. Remote I/O communi-
cations are being exe-
cuted. Either remote I/O communications, message
communications, or both are being executed.
Status is normal.
Lit green
Lit green
Synchronizing speed. Waiting for connection
with Master Unit. If only certain Slave Units show this status,
check that the baud rate is the same and then
restart the Slave Units.
Not lit
Lit green
Waiting for a connec-
tion. Waiting for a connection
with the Master Unit to
be established.
Flashing
green
Lit red
Watchdog timer error A watchdog timer error
has occurred in the
Slave Unit. Replace the Slave Unit. Alternatively, check the
Expansion Unit connection.
Not lit
Flashing
red Illegal switch setting A DIP switch or other
switch setting is illegal. Check the switch settings then restart the
Slave Units.
Not lit
EEPROM checksum
error EEPROM data error Use the CX-Integrator to restore the default
data.
Lit green
Configuration error • The same node
address has been
used more than once.
• Repeater Unit configu-
ration error
Check that the node address is set within the
allowable range and that it is used only once.
Check the Repeater Unit configuration and
then restart the Slave Units.
Lit red
Lit green
Communications time-
out --- Check the following items then restart the
Slave Units:
Is the baud rate the same for the Master Unit
and Slave Units?
Is the cable length (trunk line/branch lines)
OK?
Is the cable disconnected or loose?
Is there a Terminating Resistor on each end of
the trunk line?
Is there too much noise?
Flashing
red
Flashing
red
Lit red
Configuration error A node address has
been set out of range. Make sure that the node address is set within
the specified range, and then restart the Slave
Unit.
MS
NS
MS
NS
MS
NS
MS
NS
NS
NS
MS
NS
MS
NS
NS
NS