Mode of operation of the PL7_DRUM timer function
Original instructions
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Description
The following table describes the specific modes of operation of the PL7_DRUM function:
Effect...
Description
of a cold restart
(%S0=1) causes the reinitialization of the programmer to step 0 (with updating of the order bits).
of a warm restart
(%S1=1) causes the updating of the order bits according to the current step.
a program jump, deactivation of a task or execution of a breakpoint
The fact of not scanning the drum does not cause a reset to 0 of the order bits.
NOTE: updating of the order bits only takes place when there is a change of step or when there is a warm or cold start.
NOTE: on resetting to 0:
  • In LD and FBD, the history of the input PL7_Drum_1.U is updated with the cabled values.
  • In IL, the history of the input PL7_Drum_1.U is not updated; it retains the value it had before the call.
  • In ST, the history of the input PL7_Drum_1.U is updated with 0.