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MELSEC-Q
10 TROUBLESHOOTING
10.3.15 Troubleshooting when data cannot be communicated with the ISDN sub-address
Circumstance Cause Corrective action MC
Non
procedure
protocol
Bidirection
al protocol
• Sub-address is incorrect. • Review the sub-address.
• Modem does not support ISDN sub-
address.
• Use modem that supports ISDN sub-
address.
• Data cannot be
communicated with ISDN
sub-address
• Sub-address is incorrectly partitioned. • Review how to partition the sub-address
using the TA manual.
10.3.16 Troubleshooting when constant cycle transmission does not operate normally
Circumstance Cause Corrective action MC
Non
procedure
protocol
Bidirection
al protocol
• The setting value of the constant cycle
transmission is incorrect.
• Review the constant cycle transmission
setting.
• Does not operate in the
cycle time designated in the
constant cycle transmission
setting
• The cycle time is affected by some causes. • Remove the causes or designate the cycle
time anticipating the causes.
10.3.17 Troubleshooting when condition agreement transmission does not operate normally
Circumstance Cause Corrective action MC
Non
procedure
protocol
Bidirection
al protocol
• The setting value of the condition
agreement transmission is incorrect.
• Review the condition agreement
transmission setting.
• Does not operate in the
cycle time designated in
condition agreement
transmission setting
• The cycle time is affected by some causes. • Remove the causes or designate the cycle
time anticipating the causes.
10.3.18 Troubleshooting when data cannot be received by an interrupt program
Circumstance Cause Corrective action MC
Non
procedure
protocol
Bidirection
al protocol
• Interrupt issuance was not designated. • Designate interrupt issuance.
• Receiving by instruction other than
BUFRCVS.
• Use BUFRCVS instruction to receive
interrupt data.
• Cannot receive data with
the interrupt program
• "Parameter setting" - "PC system setting" -
or "Interrupt pointer setting" are not set on
the PLC CPU side, or the settings are
incorrect.
• Review "Parameter setting" - "PS system
setting" - "Interrupt pointer setting" on the
PLC CPU side
10.3.19 Troubleshooting when data cannot be written to Flash ROM
Circumstance Cause Corrective action MC
Non
procedure
protocol
Bidirection
al protocol
• Flash ROM overwrite allow/prohibit was not
set to allow.
• Set Flash ROM overwrite allow/prohibit to
allow.
• Cannot write data to Flash
ROM
• Setting change was not set to allow in the
switch settings by GX Developer.
• Set setting change to allow in the switch
setting by GX Developer.