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MELSEC-Q
11 TROUBLESHOOTING
Symptom Cause Corrective action
MC
Bidirectional
Non
procedure
Pre-defined
• The protocol
corresponding to the
protocol No. specified in
the control data for the
CPRTCL instruction is not
registered.
• By GX Configurator-SC (Pre-defined
protocol support function), read the protocol
setting from the Q series C24.
On the protocol selection screen, check the
registered protocol and protocol No. for an
error.
• To the same channel,
multiple CPRTCL
instructions were
concurrently executed.
• Correct the sequence program so that, upon
completion of one CPRTCL instruction
execution, another is executed.
• Incorrect control data are
specified for the CPRTCL
instruction.
• Correct the control data for the CPRTCL
instruction.
• The user-edited protocol
setting in GX Configurator-
SC (Pre-defined protocol
support function) is
inconsistent with the
packet format of the
external device.
• Check the packet format of the external
device, and correct the protocol setting.
(1) When a conversion variable exists in the
receive packet, check for an error in the
setting of Conversion, Sign character,
Number of decimals, Delimiter, or Number
of digits.
(2) When an error check code exists in the
receive packet, check for an error in the
setting of Processing method, Code type,
Data length, Data flow, Complement
calculation, or Calculating range.
(3) When Length exists in the receive packet
and a conversion variable is included in the
calculating range of the Length, check for
an error in Code type, Data length, Data
flow, or Calculating range set for the
Length.
• An expected packet was
not received, and a
monitoring timeout error
occurred.
• Using Circuit trace (communication data
monitoring function) of GX Configurator-SC
(Pre-defined protocol support function),
check the data sent from the external
device.
• If the data sent from the external device is
correct, take measures according to
Sections 11.3.11 and 11.3.12.
• When the pre-
defined protocol is
executed, the "ERR."
LED turns on.
• A communication error
occurs.
• Confirm the error by the system monitor,
and remove the cause of the error.
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