MITSUBISHI ELECTRIC QJ71C24N - Manual (Page 138)

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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 10.)
2) Confirmation using GX Configurator-SC
• The monitor function is used to check for errors. (See Sections 8.6.3 and
8.6.5.)
• The ERR LED is turned off with the ERR LED OFF function. (See Section
8.6.10.)
3) Confirming the error code
Use one of the following to confirm the error code.
• GX Configurator-SC monitor function (See Section 8.6.5.)
• 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
PLC CPU when a reception error occurs.
(b) Reading receive data
When receive data is read to the PLC CPU by turning the reception
abnormal detection signal (X4/XB) ON, the data that was normally received
prior to the error detection is read. Read and discard receive data as
needed.