Mitsubishi MELSEC LJ71C24, Руководство пользователя

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15 TROUBLESHOOTING
15.3.22 Troubleshooting on the protocol setting data reading/writing
Symptom Cause Corrective action MC
Non-
procedural
protocol
Bidirectional
protocol
Predefined
• The "ERR." LED turns on
when protocol setting
data are written to the
C24.
• The user-edited protocol setting in the
predefined protocol support function of
GX Works2 has an error.
Or, function data not supported by the
C24 are included in the protocol setting
data.
• In Protocol setting data error information
(buffer memory: 4086
H
to 4089
H
), locate
the error part (protocol No, packet No, or
element No.) and correct it. Check the
protocol setting for an error paying
attention to the following, and write
corrected data to the C24 again.
(1) When an error was detected in the
user-edited protocol
Check if the following condition for
element placement are satisfied in the
packet setting or not:
If any elements of 1) and 2) are in the
same packet, 1) must be placed before
2).
1)• Conversion variable (fixed number
of data, fixed number of digits (1 to
10), no signed character)
• Conversion variable (fixed number
of data, fixed number of digits (1 to
10), variable decimal point)
• Conversion variable (fixed number
of data, variable number of digits,
number of data is 1, delimiter set)
2)• Non-conversion variable (variable
length)
• Conversion variable (variable
number of data)
• Conversion variable (fixed number
of data, variable number of digits,
number of data is 1, no delimiter)
• Conversion variable (fixed number
of data, variable number of digits,
number of data is 2 or more)
• Non-verified reception (variable
number of characters)
(2) When function data not supported by
the C24 are included in the protocol
setting data
Check the version of the C24 to
confirm supported functions.
Set the protocol within the range of
supported functions if any unsupported
function is applied.
15.3.23 The "ERR." LED is lit
Symptom Cause Corrective action MC
Non-
procedural
protocol
Bidirectional
protocol
Predefined
• A communication error has occurred. • Check the error and remove the cause
according to Section 15.2.
• Switch settings of the C24 are incorrect. • Review the switch settings of the C24.
• The communication protocol mode is set
to "Predefined protocol mode", and
linked operation is set for two interfaces.
• For communication in the predefined
protocol mode, change the setting to
separate operations.
• "ERR." LED is lit
• The C24 is powered off while data are
written to the flash ROM.
• Write the data to the flash ROM again.