Mitsubishi QJ71C24N User Manual page 363

11 TROUBLESHOOTING
Symptom
• The protocol
• To the same channel,
• Incorrect control data are
• The user-edited protocol
• When the pre-
defined protocol is
executed, the "ERR."
LED turns on.
• An expected packet was
• A communication error
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Cause
corresponding to the
protocol No. specified in
the control data for the
CPRTCL instruction is not
registered.
multiple CPRTCL
instructions were
concurrently executed.
specified for the CPRTCL
instruction.
setting in GX Configurator-
SC (Pre-defined protocol
support function) is
inconsistent with the
packet format of the
external device.
not received, and a
monitoring timeout error
occurred.
occurs.
Corrective action
• 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.
• Correct the sequence program so that, upon
completion of one CPRTCL instruction
execution, another is executed.
• Correct the control data for the CPRTCL
instruction.
• 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.
• 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.
• Confirm the error by the system monitor,
and remove the cause of the error.
MELSEC-Q
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