Delta DVP-ES2 - Manual (Page 275)

3 . I n s t r u c t i o n S e t
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M1046:
Indicates STL(Step Ladder) status. When STL operation is activate, M1046 = ON if any of the step
point S is ON. If M1047 = ON, M1046 also activates to indicate ON status of step points. In addition,
D1040 ~ D1047 records 8 step numbers from the current ON step to the previous 7 ON steps.
M1047:
Enable STL monitoring. When IST instruction executes, M1047 will be forced ON, i.e. M1047
remains ON in every scan cycle as long as IST instruction is executing. This flag is used to monitor
all step points (S).
D1040~D1047:
Records 8 step numbers from the current ON step to the previous 7 ON steps.