Omron SYSMAC CS Series Operation Manual page 236

Troubleshooting the Network
LED Indicators
PROFIBUS protocol error: ON
(OFFLINE indicator will be ON)
Double master address error: ON
(OFFLINE indicator will be ON)
Hardware error: ON
(OFFLINE indicator will be ON)
• Auto-Clear enabled: ON
• CLEAR: ON
• Slave Diagnostics received: ON
• OPERATE: ON
• Slave Diagnostics received is:
ON
• Data Exchange: OFF
• Auto-Clear enabled: OFF
Troubleshooting the Slave
Devices
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 cor-
rectly.
• After correction, switch the Unit to CLEAR / OPERATE mode again.
A second master device with the same network address has been detected on the
PROFIBUS network. The PROFIBUS 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.
A hardware error has occurred in the PROFIBUS interface of the Unit. The PROFI-
BUS 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-Profibus.
• Check if any other faulty devices are on the same network.
• After correction, switch the Unit to CLEAR / OPERATE mode again.
This combination indicates that one of the slave devices on the network failed, caus-
ing an automatic transition to the CLEAR mode.
Check the Monitor - Slave Status tab, to see which slave failed.
The Master Unit is still in OPERATE mode, but not exchanging data with all its slave
devices. One or more of the slave devices on the network failed.
Check the Monitor - Slave Status tab, to see which slave failed.
If the Master Status tab indicates problems related to slave devices, their sta-
tus can be obtained by checking the Slave Status tab. The figure below shows
this tab. As an example a failure of slave device 2 is shown.
Description / Correction
Section 7-4
215