Appendix 7 Special Register (Sd) List - Mitsubishi Electric MELSEC-L SSCNETIII/H User Manual

Appendix 7
The special register (SD) is an internal register whose application is fixed 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 special register list.
Item
No. Special register number
Name Special register name
Description Contents of special register
Details Detailed description of special register
Set side and set timing of special register
<Set by>
• S: Set by system.
• U: Set by the user (via network or by test operation of GX Works2).
• S/U: Set by both system and user.
Set by <Set timing>
(Set timing) The following shows the set timing when the special register is set by system.
• Initial: Set during initial processing (after power-on or reset).
• Status change: Set when the operating status is changed.
• On error: Set if an error occurs.
• Switch change: Set when the switch has changed.
• Write: Set when data is written to the module.
Do not change the value of any special register set by the system using operations such as device test. Doing so may result
in system down or communication failure.
Special Register (SD) List
Description
APPENDICES
A
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