Omron CJ Series Operation Manual page 262

7 Troubleshooting and Maintenance
System-defined Variable
variables
*_MstrMdCmdErr
Cause and cor- Assumed cause
rection
More than one command mode
switch has been set.
A mode command switch is set while
the previous command is in progress.
A mode transition command is given
and the Unit has detected that it does
not (yet) have a valid configuration or
it detected an internal error, either of
which prevented it from reaching that
mode, e.g. Invalid Parameter set and
transition to OPERATE mode.
Attached None
information
Precautions/ None
Remarks
Event name Disturbed Bus Error
Meaning Distorted messages may have been received by the Unit.
Source Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
*_MstrBusErr
Cause and cor- Assumed cause
rection
Missing or invalid termination
Faulty wiring
A cable has been used which is too
long for the selected baud rate.
Attached None
information
Precautions/ None
Remarks
Event name PROFIBUS Protocol Error
Meaning A PROFIBUS protocol error has occurred and tokens have been lost.
Source Function Module
Error attributes Level
7-30
Data type
BOOL
Correction
Control only one command mode
switch.
Wait until the Unit has finished switch-
ing modes before attempting to set a
new command mode switch.
Correct the invalid configuration
and/or internal error and re-issue the
required command mode switch.
Source details
Minor Recovery
Continues Operation
Data type
BOOL
Correction
Check the termination on the appro-
priate devices.
Check the wiring.
• Correct the baud rate setting to
reflect the actual length of cable or
change the cable length based on
the required baud rate.
• Install repeater(s) if a longer cable
is needed.
Source details
Minor Recovery
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
Name
Mode Command Error
Prevention
Do not attempt to control multiple
command mode switches simultane-
ously or prevent with User Program.
Do not issue a mode change while
the Unit is in transition. Check that the
commanded operating mode has suc-
cessfully completed before issuing a
new mode change.
Do not attempt to change modes
when an invalid configuration or inter-
nal error is present.
Event code 88040000 hex
CJ-series Unit Detection
timing
Cycle the Power Log category
Supply
During network operation the Unit detects distorted mes-
sages and will switch to OFFLINE mode.
Name
Disturbed Bus Error
Prevention
Follow specific termination resistance
requirements set in this manual.
Follow specific wiring guidelines set in
this manual.
Follow maximum cable length specifi-
cations set in this manual.
Event code 88050000 hex
CJ-series Unit Detection
timing
Switch the Unit to Log category
CLEAR/OPER-
ATE mode again
At network opera-
tion
System
At network opera-
tion
System