Troubleshooting
Section 7-2
87
I/O data communication problems (continued)
Description
Possible cause
Possible remedy
COMM LED is ON
but DP-ERR LED is
flashing
The wiring is not correct.
Check IR n+3 to find out where / what the
possible problem is.
Check if the correct pins are connected, if
there are no short circuits, if the stub-lines are
not too long.
Configuration is not correct.
Check IR n+3 to find out where / what the
possible problem is.
Check if the DP-slaves have the same station
address as in the configuration.
Check if no station address is used twice.
Check that all masters in the same network
have been configured to the same baud rate.
Check if the correct GSD-files are being used.
Check that the bus parameters have the
correct value. It is recommended to use the
default bus parameters (e.g. HSA must be
greater or equal to the highest master node
address in the network).
After changing the configuration, download
the configuration to the respective Master
Unit.
The Master Unit is faulty
Replace the Master Unit.
No I/O data is
exchanged with the
PLC though the
The I/O data mapping has been defined at the
wrong PLC data area.
Make sure that the Unit settings are made in
the correct DM memory area; the area
depends on the unit number setting.
COMM LED is ON
The I/O data mapping contains errors that
caused that certain or no data areas to be
mapped at all. The ERR LED is Flashing.
Check the Unit settings. IR n+2.09 and IR
n+2.10 of the status words indicates what
caused the error.
The Run bit (IR n.00) is OFF
Set the Run bit IR n.00 ON.
Another Special I/O Unit makes use of the
same data area(s).
Check the mapping of the Master Unit and the
other Special I/O Unit. If they overlap, then
one Unit overwrites the data area of the other
Unit and makes it look like that no data is
being exchanged with the PLC. If an overlap
exists, the Unit settings should be changed.
The Master Unit is faulty
Replace the Master Unit.
I/O data does not
seem to get
exchanged with a
specific slave
Slave is not connected properly.
Check IR n+3 to find out where / what the
possible problem is.
Check if the slave is connected properly. Are
the correct pins connected, Is the shield also
connected, is the bus length not exceeded?
The slave operates in ‘Sync’ / ‘Freeze’-mode.
In these modes, the data is only updated after
another transmission of the ‘Sync’ / ‘Freeze’
command. If this is not desired, these modes
should be turned OFF. See section 5-3-1 for
more details.
The master or the transmission line has failed,
the watchdog of the slave 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).
Slave Unit is faulty.
Replace the Slave Unit.
Содержание C200HW-PRM21
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Страница 5: ...C200HW PRM21 PROFIBUS DP Master Unit Operation Manual Produced May 2000...
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Страница 126: ...Authorised Distributor Cat No W349 E2 2 Note Specifications subject to change without notice Printed in the Netherlands...