Mitsubishi MELSEC QJ71C24, User Manual

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MELSEC-Q
11 TROUBLESHOOTING
11.3.22 Troubleshooting on the protocol setting data reading/writing
Symptom Cause Corrective action MC
Non
procedure
protocol
Bidirectional
protocol
Pre-
defined
• The "ERR." LED turns on
when protocol setting
data are written to the Q
series C24.
• The user-edited protocol setting in GX
Configurator-SC (Pre-defined protocol
support function) has an error.
Or, function data not supported by the Q
series 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 Q series 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 sign 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 Q series C24 are included in the
protocol setting data
Check the version of the Q series C24N
to confirm supported functions.
Set the protocol within the range of
supported functions if any unsupported
function is applied.