Mitsubishi MELSEC QJ71C24, User Manual

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MELSEC-Q
6 DATA COMMUNICATION USING THE NON PROCEDURE PROTOCOL
(2) Confirmation using the module and GX Configurator-SC
1) Confirmation using the display LED
When the Q series C24 detects an error, including a transmission error, the
ERR LED lights up. (See Chapter 11.)
2) Confirmation using GX Configurator-SC
• The monitor function is used to check for errors. (See Sections 9.6.3 and
9.6.5.)
• The ERR LED is turned off with the ERR LED OFF function. (See Section
9.6.10.)
3) Confirming the error code
Use one of the following to confirm the error code.
• GX Configurator-SC monitor function (See Section 9.6.5.)
• GX Developer buffer memory monitor function (monitors addresses
258
H
/268
H
)
(3) Receive data when a reception error occurs
(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 Q series C24.
Thus, there may be missing data among the data that has been read to the
programmable controller CPU when a reception error occurs.
(b) Reading receive data
When receive data is read to the programmable controller CPU 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.