Appendix 6 Special Relay (Sm) - Mitsubishi Electric MELSEC L Series User Manual

Appendix 6
The special relay (SM) is an internal relay whose application is determined in the programmable controller. However, it
can be turned on/off as needed to control the head module.
The following table shows how to read the list of special relay areas.
Item
No.
Name
Meaning
Explanation
Set by
(Set timing)
Do not change the value of any special relay areas set by the system by performing test operation. Doing so may result in
system down or communication failure.
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Special Relay (SM)
Special relay number
Special relay name
Contents of the special relay
Detailed description of the special relay
Set side and set timing of the special relay
<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
Write: When data are written to the module
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