Omron CJ1W-PRT21 Operation Manual page 70

Troubleshooting
Table 11 I/O data communication problems
Description
COMM LED is OFF Control bit CIO n+1.00 of the control bits
and BF LED is ON is OFF.
The PROFIBUS communication is inhib-
ited.
The PROFIBUS configuration is not cor-
rect, There is NO communication with
master.
The PROFIBUS wiring is not correct.
The PROFIBUS network has not been
terminated correctly.
The PROFIBUS master unit is defective
The Slave Unit is defective.
COMM LED is OFF The PROFIBUS configuration is not cor-
and BF LED is flash- rect. There is communication with mas-
ing ter.
No configuration data is selected for
slave
The Slave Unit is defective.
Possible cause Possible remedy
Set the Start communication bit (CIO n.00).
Verify that the correct GSD-file (OC_0602.GSD) is
used in the master.
Verify that the Unit has the same station address as in
the master's configuration.
Verify that no station address is used twice.
Verify that the correct pins of the BUS connector are
connected, that there are no short circuits or line inter-
ruptions, the correct cable type is used, and that the
stub lines are not too long (see 3-3-1 Fieldbus cabling ).
Terminate the network at the appropriate places. See
3-3-1 Fieldbus cabling ).
Replace the master unit.
Replace the CJ1W-PRT21.
Check CIO n+1.08 (Parameter/Configuration Error flag)
Verify the configuration and the parameter data of the
slave
After changing a configuration, download the configura-
tion to the applicable master unit.
Verify that the network has been configured to commu-
nicate at a baud rate supported by the Unit.
Check the configuration at the master.
Replace the CJ1W-PRT21.
Section 5-2
51