App - 3 App - 3
MELSEC
APPENDIX
(3) Retry processing for error that will occur during system switching
processing
When the MELSEC data link library is used to access the Redundant CPU during
system switching being processed by the Redundant CPU, a system switching
error (error code 4248
H
), CPU starting error (error code 4004
H
), other system
CPU module error (error code 4245
H
),access destination illegal error (error code
FFDF
H
) or similar error occurs.
Create a program that will check the error code and perform retry processing as
necessary in that case.
(a) The following indicates the functions that will result in error if
executed during system switching.
Functions that will result in error by system switching
MELSEC data link library
mdControl,mdDevRst,mdDevSet,mdRandR,mdRandW,
mdReceive,mdSend,mdTypeRead
(b) The following example gives a flowchart for error occurrence
at batch write.
START
END
YES
NO
YES
NO
Wait processing
is executed.
Has error occurred?
Normal processing is executed.
Error code is checked.*
Does the error
require retry processing?
Error handling is executed.*
Retry processing
Write processing
(mdSend instruction), etc.
1
2
*1: For the details and corrective action of the error code, refer to "Error
code returned to request source during communication with CPU
module" in the QCPU User's Manual (Hardware Design, Maintenance
and Inspection).
*2: Execute retry processing as required depending on the system
specifications.
Summary of Contents for Q80BD-J71BR11
Page 2: ......
Page 24: ...A 22 A 22 MEMO ...
Page 50: ...4 6 4 6 MELSEC 4 FUNCTION MEMO ...
Page 92: ...6 36 6 36 MELSEC 6 PROCEDURE AND SETTINGS UP TO THE POINT OF OPERATION MEMO ...
Page 132: ...10 2 10 2 MELSEC 10 MELSEC DATA LINK LIBRARY MEMO 10 ...
Page 138: ...11 6 11 6 MELSEC 11 PROGRAMMING MEMO ...
Page 164: ...12 26 12 26 MELSEC 12 APPLICATION FUNCTIONS MEMO ...
Page 166: ...13 2 13 2 MELSEC 13 ERROR CODE MEMO 13 ...
Page 223: ......
