Omron CJ Series User Manual

7-11
7 Troubleshooting and Maintenance
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
7-3 Troubleshooting Using Error Status
7
7-3-2 Master Errors Word
The Master Errors word (*_MstrErrSta) contains error indications on the PROFIBUS interface and
network. The corresponding bit flag will change to TRUE if an error event has occurred.
7-3-2 Master Errors Word
Bit Name Description/Correction
*_MstrBusErr
Disturbed bus Error
An error has occurred in the PROFIBUS interface with
distorted messages received by the PROFIBUS Master
Unit.
Most likely causes:
• No or invalid termination or no inductors used at high
baud rates.
• Faulty wiring.
To correct this:
• Check the termination on the appropriate devices.
• Restart the CPU Unit to re-download the configuration.
• If the problem persists, use CX-ConfiguratorFDT to re-
download the configuration.
• If the problem persists, replace the PROFIBUS Master
Unit.
*_MstrProtErr PROFIBUS protocol error An error has occurred in the PROFIBUS interface with
distorted messages received by the PROFIBUS Master
Unit.
Most likely causes:
• Lost token messages (the token is not returned).
To correct this:
• Check the master devices on the network, and make
sure they are all working correctly.
• After correction, switch the Unit to CLEAR / OPERATE
mode again.
*_MstrAdrErr Master Address Duplication Error A second master device with the same network address
has been detected on the PROFIBUS network. The PRO-
FIBUS Master Unit has switched to OFFLINE.
To correct this:
• Check the master devices on the network and ensure
that they have unique device addresses.
• After correction, switch the Unit to CLEAR / OPERATE
mode again.
*_MstrHwErr Hardware error A hardware error has occurred in the PROFIBUS interface
of the Unit. The PROFIBUS Master Unit has switched to
OFFLINE.
Most likely causes:
• Faulty wiring,
• Broken messages,
• Short-circuits, or
• Faulty bus timings.
• A master device has been detected beyond the Highest
Station Address (HSA).
To correct this:
• Check the network wiring, and make sure it is correct.
• Check for short-circuits.
• Check the bus timing set through CX-ConfiguratorFDT.
• Check if any other faulty devices are on the same net-
work.
• After correction, switch the Unit to CLEAR / OPERATE
mode again.

Omron CJ Series Specifications

General

Brand	Omron
Model	CJ Series
Category	Controller
Language	English