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CHAPTER 14 MODULE CHANGE DURING SYSTEM OPERATION
14
14.1 Online Module Change
(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
online10
H
)
Refer to Page 454, Appendix 2 for details of SM235 and SM236 and to Page 506, Appendix 3 for details of
SD235.
OFF
ON
OFF
ON
SM235
SD235
SM236
1 scan
Online module
change start
Online module
change completed
Starting I/O number of module being
changed online 10
H
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