Omron CJ Series Operation Manual page 253

Problem
PROFIBUS Master Unit
is configured. All slaves
were in data exchange,
but it has now stopped.
PROFIBUS Master Unit
is configured. After
switching the Master Unit
to OPERATE, the Unit
itself or other Units on the
CPU showed unex-
pected behavior.
PROFIBUS Master Unit
is configured. All slaves
were in data exchange,
but all outputs are now
set to zeros. Inputs can
still be read.
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
Probable Cause
No power is supplied to the system. All
indicators on the system are OFF.
A CPU error occurred.
• The ERH indicator is ON, the other indi-
cators are OFF.
• The ERR/ALM indicator on the CPU is
ON.
A Unit error occurred.
• The ERC indicator is ON, the other indi-
cators are OFF.
• The ERR/ALM indicator on the CPU is
ON.
The PROFIBUS Master Unit is in either
OFFLINE or STOP mode.
• The BST indicator is OFF
• The BF indicator is ON: A PROFIBUS
interface error has occurred: see Mas-
ter Errors flags (*_MstrBusErr,
*_MstrProtErr, *_MstrAdrErr,
*_MstrHwErr).
Network cabling is not correct.
BF indicator is ON.
• Master Errors flag may provide more
information (*_MstrBusErr,
*_MstrProtErr, *_MstrAdrErr,
*_MstrHwErr).
The I/O data mapping of the Master Unit
may overwrite either its own or other Unit
CIO/DM Areas settings:
• Master Unit operational mode changes
unexpectedly.
• Global-Control commands are transmit-
ted unexpectedly.
• Other Special I/O Units or Special Bus
Units change behavior unexpectedly.
The bus parameter used on the network
are wrong.
• I/O data exchange between the Master
Unit and the CPU stops.
The Master Unit is in CLEAR mode.
• The BST indicator is Flashing.
• The CLEAR switch has been set in the
Switch word 1 (*_MstrClearCmd).
• The Unit has been configured for Auto-
CLEAR and an error occurred on the
Network with one or more slave
devices.
7 Troubleshooting and Maintenance
Correction
Verify that power is supplied to the sys-
tem.
Determine error in the CPU.
Refer to the NJ Series CPU Unit Hard-
ware User's Manual (Cat. No. W500) and
NJ-series CPU Unit Software User's Man-
ual (Cat No. W501) for more details on
these errors.
Restart the Unit, and read the error log to
determine the type of error.
Determine the mode of the Unit: Check
the Master Status word
(*_MstrOperateSta, *_MstrStopSta,
*_MstrClearSta, *_MstrOfflineSta). If Unit
is in OFFLINE or STOP mode:
• Verify that the master does not use the
same address as another Master Unit
on the network. Otherwise, correct the
Master Unit's PROFIBUS address.
• Set CLEAR or OPERATE switch in
*_SwCmd.
Verify that the network installation is cor-
rect:
• Verify that the network is still in tact, and
connected to the Unit.
• Verify that any repeaters used are func-
tioning correctly.
Verify the I/O Mapping of the Master Unit:
• Ensure that the I/O data of the Master
Unit does not overwrite its own CIO
words.
• Ensure that the I/O data of the Master
Unit does not overwrite CIO words or
DM words of other Special I/O or Spe-
cial CPU Units (e.g. Ethernet Units)
Verify that the correct bus parameters
have been used.
• (If necessary) Restart the Unit and force
it to OFFLINE immediately, or
• Disconnect the network cable first and
restart the Unit.
• Download the correct Bus parameters.
• If Auto-CLEAR is enabled, correct the
network problem first.
• Set OPERATE switch
(*_MstrOperateCmd) to force the Unit to
the OPERATE mode.
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