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 - Mitsubishi Electric MELSEC iQ-R Series User Manual

Communication is not established with the ISDN sub-address
when using a modem
Symptom
Data cannot be
communicated with ISDN
sub-address

Fixed cycle send is not performed normally

Symptom
The programmable controller
CPU monitoring function
does not operate in the cycle
time designated by the fixed
cycle send setting.

Condition match send is not performed normally

Symptom
The programmable controller
CPU monitoring function
does not operate in the cycle
time designated by the
condition match send setting.

Data cannot be received by an interrupt program

Symptom
Data cannot be received by
an interrupt program.

Data cannot be written to flash ROM

Symptom
Data cannot be written to the
flash ROM.
Data written to flash ROM
are not valid.
27 TROUBLESHOOTING
472
27.3 Troubleshooting by Symptom
Cause Corrective action
Sub-address is incorrect.
The modem does not support
ISDN sub-address.
Delimiter code for sub-
address is incorrect.
Cause Corrective action
The setting value of the fixed
cycle send is incorrect.
The cycle time is affected by
some causes.
Cause Corrective action
The setting value of the
condition match send is
incorrect.
The cycle time is affected by
some causes.
Cause Corrective action
C24 receives data by an
instruction other than
BUFRCVS.
The parameter settings for Review the parameter settings from [Module Parameter] 
C24 from [Module Parameter] [Interrupt Settings].
 [Interrupt Settings] are not
configured, or the settings are
incorrect.
Cause Corrective action
The setting change is not set
to be enabled in the
parameter settings with
Engineering tool.
The power of C24 was turned Write the data again to the flash ROM.
OFF while writing to the flash
ROM.
Communication with
Engineering tool was
interrupted while writing to the
flash ROM.
• Review the sub-address.
• Use modem supporting ISDN sub-address.
• Review the delimiter code in accordance with the manual for
the TA.
• 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))
• Remove the causes or designate the cycle time taking the
causes into consideration.
• 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))
• Remove the causes or designate the cycle time taking the
causes into consideration.
• Use BUFRCVS instruction to receive interrupt data.
• Set the setting change to 'Enable' with Engineering tool.
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