11
TROUBLESHOOTING
11.1 Troubleshooting
11 - 4
9
PROGRAMMING
10
DEDICATED
INSTRUCTIONS
11
TROUBLESHOOTINGAPPENDICESINDEX
Table11.2 Troubleshooting of errors indicated by X signals (Continued)
No. Symptom Check point Corrective action Reference
7
The Automatic
communication error
status (X7/XF) turned on.
Check if the timer settings in the automatic
communication parameters are
appropriate.
• Check the processing time of the target
device.
• Check if, because of a small request
interval timer value, another request is
transmitted before receiving a response
from the target device.
• Check if, because of a small response
monitoring timer value, the timer has
timed out with an error before the target
device returns a response.
For the error, set a larger response
monitoring timer value.
• Check if the next request was sent
before completion of the processing of
the target device because of a small
broadcast delay value.
For the error, set a larger broadcast
delay value.
Section 7.2.1
Were the automatic communication
function and the MBRW or MBREQ
instruction used on the same channel?
Set automatic communication parameters
and create a sequence program
appropriately so that each of the MBRW
and MBREQ instructions can be executed
in the right timing.
Section 9.2.3
8
The CH common/CH1
error (X1B) or CH2 error
(X1C) turned on.
Refer to "The ERR. LED turned on."
This section
(1)-2
9
The MODBUS device
assignment parameter
setting existence (XA)
does not turn on.
Is the slave function used?
When the slave function is not used, the
MODBUS device assignment
parameter setting existence (XA) is off.
-
Is the MODBUS device assignment
parameter setting completed?
Set the MODBUS device assignment
parameters by GX Configurator-MB.
Or, set the MODBUS device
assignment parameters by a sequence
program.
Section 7.3
Section 9.1.2
In the setting for the MODBUS device
assignment parameter starting method on
the intelligent function module switch,
select "OFF: Start with the default
parameters".
Section 6.6
Check if the MODBUS device
assignment parameter setting, error
completed (X9) is on.
Refer to "MODBUS device assignment
parameter setting, error completed (X9)
turned on."
This section
(2)-4
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