Omron GRT1 - 27-11-2006 Operation Manual page 85

Other Errors
Problem
PROFIBUS DP Master Unit
is configured. Some, but
not all slaves exchange
data.
PROFIBUS DP Master Unit
is configured. All slaves
were in data exchange, but
it has now stopped.
PROFIBUS DP Master Unit
is configured. All slaves
were in data exchange, but
all outputs are now set to
zeros. Inputs can still be
read.
66
Probable cause
Network cabling is not correct.
• Master's and/or Unit's BF LED indicator is
ON or Flashing.
• Master Status 2 error flag may provide
more information (Master CIO Word n+6,
bit 00 ~ 03, see Note).
• Master CIO Words n+9 to n+16 show
which slaves have problems.
Configuration is not correct.
• Master BF LED indicator is Flashing.
• Master CIO Words n+9 to n+16 show
which slaves have problems.
• Use Cx-Profibus and DTMs to determine
slave diagnostics.
The configuration contains timing errors.
• Master's BF LED indicator is Flashing.
• Slaves are sometimes briefly in and out of
data exchange.
Specific slave devices are configured and
allocated to the Master Unit, but the slave
which is not exchanging data may have been
disabled using the FINS STOP command.
No power is supplied to the system. All LED
indicators on the system are OFF.
The PROFIBUS DP Master Unit is in either
OFF-LINE or STOP mode.
• The Master BST LED indicator is OFF
• The Master and/or Slaves' BF LED indica-
tors are ON: A PROFIBUS interface error
has occurred: see Master Status 2 error
flags (Master CIO Word n+6, bit 00 ~ 03,
see Note) for details.
Network cabling is not correct.
• Master and/or Slaves' BF LED indicator
are ON.
• Master Status 2 error flag may provide
more information (CIO Word n+6, bit 00 ~
03, see Note).
The Master Unit is in CLEAR mode.
• The BST LED indicator is Flashing.
• The CLEAR switch has been set in the
Switch word 1 (CIO Word n, bit 02, see
Note)
• The Unit has been configured for Auto-
CLEAR and an error occurred on the Net-
work with one or more slave devices.
Correction
Verify that the network installation is correct:
• Verify that all slaves are powered up and
functioning correctly.
• Verify that all slave devices are correctly
connected to the network.
• Verify that any repeaters used are func-
tioning correctly.
• Check the cable length versus the
selected baud rate.
• Verify that any stubs used are not too
long.
• Verify that termination (resistors and
inductors) are properly set and used.
Verify that the configuration is correct:
• Verify that address of targeted slave
device matches the configured address.
• Verify that the slave parameter and config-
uration settings are correct.
• Verify that the watchdog setting for the
slave device is not too low.
• Verify that the Bus parameter sets are cor-
rect. If necessary, increase Target Rota-
tion Time and/or Min. Slave Interval
parameters.
• Re-download the configuration.
• If the problem persists, replace the Unit.
Use the FINS RUN command to enable the
slave devices.
• Verify that power is supplied to the sys-
tem.
Determine the mode of the Master Unit:
Check the Master Status 1 Word (Master
CIO Word n+5, bit 00 to bit 03, see Note). If
Master Unit is in OFF-LINE 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 CIO
Word n (see Note).
Verify that the network installation is correct:
• Verify that the network is still in tact, and
connected to the Unit.
• Verify that any repeaters used are func-
tioning correctly.
• If Auto-CLEAR is enabled, correct the net-
work problem first.
• Set OPERATE switch in CIO Word n (see
Note) to force the Unit to the OPERATE
mode.
Section 4-3