Troubleshooting
Section 7-2
88
I/O data communication problems (continued)
Description
Possible cause
Possible remedy
Outputs are being
reset.
Run bit (IR n.00) is OFF. This can be due to a
fatal PLC error or due to a mode change to /
from PROGRAM mode.
Check if the PLC is in PROGRAM mode, or if
a fatal PLC has occurred. Find the cause of
the fatal error, set IR n.00 ON and operate the
outputs.
IR n+2.02 set? If so, the ‘Data_Control_Timer’
of one of the slaves has expired and the
‘Auto_clear’ is enabled. The master has
entered the network state ‘Clear’. (see for more
details section 1-4-4)
Check IR n+3 to find out where / what the
possible problem is.
Fix or remove the slave that caused the
master to enter the ‘Clear’ state or disable the
‘Auto_clear’ mode (see section 4-3-7)
The master or the transmission line has failed,
the watchdog of the slave (if enabled) has
switched the outputs of the slave to the fail-
safe state.
Check the transmission line and master Unit
or disable the slave’s watchdog (not
recommended).
The PLC cycle time is greater than the
configured watchdog time of the slave which
results in expiration of the watchdog in the
synchronous mode. This switches the outputs
to the fail-safe state.
Increase watchdog time or decrease PLC
cycle time or choose asynchronous mode.
The Master Unit is faulty.
Replace the Master Unit.
Outputs do not
change anymore
Run bit (IR n.00) is OFF. This can be due to a
fatal PLC error or due to a mode change to /
from PROGRAM mode, with DM m+17 = 1
(hold mode).
Check if the PLC is in PROGRAM mode, or if
a fatal PLC has occurred. Find the cause of
the fatal error, set IR n.00 ON and operate the
outputs.
Program execution has stopped due to a fatal
PLC error or PLC is in PROGRAM mode and
DM m+17 = 1
Check if the PLC is in PROGRAM mode or if
a FALS error was generated.
The slave operates in ‘Sync’-mode.
In this mode the data is only updated after
another transmission of the ‘Sync’-command.
If this is not desired, this mode should be
turned OFF. See section 5-3-1 for more
details.
The Master Unit is faulty
Replace the Master Unit.
Inputs do not
change anymore
Run bit (IR n.00) is OFF. This can be due to a
fatal PLC error or due to a mode change to /
from PROGRAM mode.
Check if the PLC is in PROGRAM mode, or if
a fatal PLC has occurred. Find the cause of
the fatal error, set IR n.00 ON and check the
outputs.
The slave operates in ‘Freeze’-mode.
In this mode the data is only updated after
another transmission of the ‘Freeze’-
command. If this is not desired, this mode
should be turned OFF. See section 5-3-1 for
more details.
The Master Unit is faulty
Replace the Master Unit.
ERR LED is
switched ON
A fatal error is detected. The cause is reported
in IR n+2.06 ~ IR n+2.08
Try to solve the cause and / or restart the
Unit. If this does not help, replace the Master
Unit
Содержание C200HW-PRM21
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Страница 126: ...Authorised Distributor Cat No W349 E2 2 Note Specifications subject to change without notice Printed in the Netherlands...