Mitsubishi Electric Q26UD(E)HCPU User Manual page 271

(3) Special relays and special register related to online module change
Information during online module change is stored into the special relays (SM235, SM236) and special register
(SD235).
• Whether the online module change of the corresponding CPU module is executed or not can be checked by
monitoring SM235, SM236 and SD235.
• SM235: Online module change flag (turns on during online module change)
• SM236: Flag that turns on only one scan after online module change (turns on only one scan after
completion of online module change)
• SD235: Module being changed online (stores the starting I/O number of the module being changed
online10 )
H
Refer to Page 454, Appendix 2 for details of SM235 and SM236 and to Page 506, Appendix 3 for details of
SD235.
SM235
OFF
SD235
SM236
OFF
CHAPTER 14 MODULE CHANGE DURING SYSTEM OPERATION
Online module
change start
ON
Starting I/O number of module being
changed online 10
H
Online module
change completed
ON
1 scan
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