Appendix 7 Special Register (Sd) - Mitsubishi Electric MELSEC L Series User Manual

Appendix 7
The special register (SD) is an internal register whose application is determined in the programmable controller.
However, data can be written to the special register to control the head module as needed. Data is stored in binary
format if not specified.
The following table shows how to read the list of special register areas.
Item
No.
Name
Meaning
Explanation
Set by
(Set timing)
Do not change the value of any special register areas set by the system by performing test operation. Doing so may result in
system down or communication failure.
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Special Register (SD)
Special register number
Special register name
Contents of the special register
Detailed description of the special register
Set side and set timing of the special register
<Set by>
S: Set by the system.
U: Set by a user (via network or by test operation from GX Works2).
S/U: Set by both the system and a user.
<Set timing>
The set timing is described only for the special relay areas set by the system.
Initial: During initial processing (after power-on or reset)
Status change: When the operating status is changed
Error: When an error occurs
Switch change: When the switch is changed
Write: When data are written to the module
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