472
27 TROUBLESHOOTING
27.3 Troubleshooting by Symptom
Communication is not established with the ISDN sub-address
when using a modem
Fixed cycle send is not performed normally
Condition match send is not performed normally
Data cannot be received by an interrupt program
Data cannot be written to flash ROM
Symptom Cause Corrective action MC Non Bi Pd
Data cannot be
communicated with ISDN
sub-address
Sub-address is incorrect. • Review the sub-address.
The modem does not support
ISDN sub-address.
• Use modem supporting ISDN sub-address.
Delimiter code for sub-
address is incorrect.
• Review the delimiter code in accordance with the manual for
the TA.
Symptom Cause Corrective action MC Non Bi Pd
The programmable controller
CPU monitoring function
does not operate in the cycle
time designated by the fixed
cycle send setting.
The setting value of the fixed
cycle send is incorrect.
• Review the settings for the fixed cycle send.
(Check if the cycle shorter than the one calculated with the
monitoring timing of the CPU module has been set, etc.
(Page 123 Monitoring timing of CPU module))
The cycle time is affected by
some causes.
• Remove the causes or designate the cycle time taking the
causes into consideration.
Symptom Cause Corrective action MC Non Bi Pd
The programmable controller
CPU monitoring function
does not operate in the cycle
time designated by the
condition match send setting.
The setting value of the
condition match send is
incorrect.
• Review the settings for the condition match send.
(Check if the setting value of the programmable controller
CPU monitoring function designation is incorrect. (Page
125 Condition match send))
The cycle time is affected by
some causes.
• Remove the causes or designate the cycle time taking the
causes into consideration.
Symptom Cause Corrective action MC Non Bi Pd
Data cannot be received by
an interrupt program.
C24 receives data by an
instruction other than
BUFRCVS.
• Use BUFRCVS instruction to receive interrupt data.
The parameter settings for
C24 from [Module Parameter]
[Interrupt Settings] are not
configured, or the settings are
incorrect.
Review the parameter settings from [Module Parameter]
[Interrupt Settings].
Symptom Cause Corrective action MC Non Bi Pd
Data cannot be written to the
flash ROM.
The setting change is not set
to be enabled in the
parameter settings with
Engineering tool.
• Set the setting change to 'Enable' with Engineering tool.
Data written to flash ROM
are not valid.
The power of C24 was turned
OFF while writing to the flash
ROM.
Write the data again to the flash ROM.
Communication with
Engineering tool was
interrupted while writing to the
flash ROM.
To Next Page
Loading...
