Omron CJ Series - Troubleshooting PROFIBUS DP-V1 Communication

7 Troubleshooting and Maintenance
7-22
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
This section deals with troubleshooting the PROFIBUS DP-V1 Communication on the network from
a behavior point of view. The column on the left describes the general perceived problem to the
user. The columns on the right list the possible causes and their remedies.
PROFIBUS Master Unit
is configured. All slaves
are in data exchange, but
the outputs of some slave
devices are not updated.
The specified slave devices may be in
Sync mode.
Send a Global-Control Unsync command
to the targeted slave or group of slaves.
Refer to 4-2-2 Global-Control Command
(*_GlobCtlCmd).
The specified slave device may have its
watchdog disabled and is disconnected
from the network, due to a cabling prob-
lem.
• BF indicator is Flashing.
• Slave Data Exchange Active Flags
show which slaves have problems.
• Use CX-ConfiguratorFDT and DTMs to
determine slave diagnostics.
Verify that the specified slave device is
still connected to the network.
PROFIBUS Master Unit
is configured. All slaves
are in data exchange, but
the inputs of some slave
devices are not updated.
The specified slave devices may be in
Freeze mode.
Send a Global-Control Unfreeze com-
mand to the targeted slave or group of
slaves. Refer to 4-2-2 Global-Control
Command (*_GlobCtlCmd)
The specified slave device may have its
watchdog disabled and is disconnected
from the network, due to a cabling prob-
lem.
BF indicator is Flashing.
Slave Data Exchange Active Flags show
which slaves have problems.
Use CX-ConfiguratorFDT and DTMs to
determine slave diagnostics.
Verify that the specified slave device is
still connected to the network.
7-4-4 Troubleshooting PROFIBUS DP-V1 Communication
Problem Probable Cause Correction
PROFIBUS Master Unit
is configured. Both the
I/O Communication and
the PROFIBUS DP-V1
Communication fail.
A possible problem with the network. Please refer to sections 7-4-2 Trouble-
shooting the Network using CX-Configu-
ratorFDT and/or 7-4-3 Troubleshooting
I/O Communication.
The I/O Configuration is incorrect and the
slave device is not in data exchange with
the PROFIBUS Master Unit.
Correct the I/O Configuration if required.
PROFIBUS Master Unit
is configured and the I/O
Communication is oper-
atiional.
The PROFIBUS DP-V1
Communication fails.
Commands can not be send to a PROFI-
BUS Slave which has address value zero.
Change the address of the PROFIBUS
Slave and the PROFIBUS configuration if
required.
When communicating with the DTM or
from the CPU program, the previous
PROFIBUS DP-V1 communication ses-
sion may not have been ended correctly.
Corresponding PROFIBUS DP-V1 Con-
nection bit (refer to l Acyclic Connec-
tion/Abort Status Box) is still set.
Put the DTM offline and online again to
initiate communication.
If this does not clear the problem, put the
master in OFFLINE mode and back into
the original state.
The PROFIBUS Slave may not support
PROFIBUS DP-V1 (class 1 or class 2).
Please check the Slave’s Operation man-
ual or GSD file.
Problem Probable Cause Correction