Troubleshooting; Troubleshooting For Errors Shown By Indicators - Omron CRT1 - 10-2009 Operation Manual

Troubleshooting

12-2 Troubleshooting

12-2-1 Troubleshooting for Errors Shown by Indicators

Indicators Are Lit or Flashing Red
Problem
MS indicator is lit red.
MS indicator is flashing
red.
The NS indicator lights
red without flashing
green.
The NS indicator lights
green momentarily and
then changes to red. The
NS indicator lights green
momentarily and then
changes to flashing red.
• The Slave Unit is malfunctioning. Replace the Slave Unit.
• The Expansion Unit is disconnected. Check the Expansion Unit connection.
• The DIP switch or other setting is illegal. Check the switch settings then restart the Slave
Unit.
• There is an error in the Slave Unit's EEPROM memory data. Double-click the icon for the
Slave Unit in the CX-Integrator. The Configuration Window will open. Click the Default Set-
ting Button and then click the Reset Button. Replace the Slave Unit if the MS indicator
keeps flashing red even after the data has been returned to the default settings.
Check the following items, and then restart the Slave Unit with the error.
• The node address has been set out of range or duplicated, or a Repeater Unit configuration
error has occurred. Check all node addresses and check the Repeater Unit configuration
and change the settings if required.
• Make sure that the I/O words allocated to the Slave Unit are not used by any other Slave
Unit. If the same words are being used by more than one Slave Unit, change the node
address.
• Refer to the next item "The NS indicator lights green momentarily and then changes to red".
• Replace the Slave Unit if its NS indicator is always lit red.
Check the following items then restart the Slave Unit with the error.
• Check that a Terminating Resistor (121 Ω) is connected to each end of the network's trunk
line. If the correct Terminating Resistors are not set, connect a Terminating Resistor of
121 Ω.
• Check that all Slave Units are set correctly.
• Check that the communications cable is wired correctly.
• Check that the power supply cable and power supply are wired correctly and that the set-
tings are correct.
• Check connector wiring for all nodes to make sure that the communications cable and power
supply cables are not disconnected.
• Check that the communications power is supplied correctly.
• If there are devices in the vicinity that generate noise, take necessary measures against the
noise to protect the Master Unit and Slave Units and the communications cable.
• If using an OMRON Master Unit, refer to the manual for that Master Unit if an error has
occurred in the Master Unit. If using a Master from another manufacturer, refer to the user's
manual for that product if an error has occurred in the Master.
• Replace the Slave Unit if its NS indicator is always lit red.
Cause and possible corrections
Section 12-2
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