Mitsubishi MELSEC LJ71C24, User Manual

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10 DATA COMMUNICATION USING THE NONPROCEDURAL PROTOCOL
(2) Confirmation using GX Works2, display unit, or indicator LED of
C24
The following methods are available for confirmation.
Item Reference
"Module's Detailed Information"
screen
Chapter 15
"Error History" screen Chapter 15
GX Works2
"Intelligent Function Module
Monitor" screen GX Works2 Version1 Operating
Manual
(Intelligent Function Module)
Display unit Buffer memory monitor
MELSEC-L CPU Module User's
Manual (Function Explanation,
Program Fundamentals)
Indicator LED
of C24
ERR LED turns on Chapter 15
(3) Precautions
The following shows the precautions of reception data in case of errors.
(a) Storing receive data
The receive data for which an error was detected is discarded and only the
normally received data is stored in the C24.
Thus, there may be missing data among the data that has been read to the
CPU module when a reception error occurs.
(b) Reading receive data
When receive data is read to the CPU module by turning the reception
abnormal detection (X4/XB) ON, the data that was normally received prior to
the error detection is read. Read and discard receive data as needed.