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This is a multi-scan instruction, because
it takes multiple scans to complete, it cannot be used in either Subroutines or Interrupt
Service Routines. It can used in Programs and under special
circumstances can it be used in Stages inside of a Program or in Tasks. See the help topic “Instruction Set Chart”
for more information. The Drum instruction writes to a Heap item
that can be found here. Any outputs that you place in the Drum will
be controlled by the Drum when the PLC is in Run. So do not try to control any of these outputs
elsewhere in your program The Step Preset is the step in which the Drum
will start on when enabled or reset. Each step of the drum you can select a Time,
an event or both a Time and event. If you select both Time and event, the time
will only start counting down once the Event becomes true. When the Drum has ran through all of it’s
steps it will remain in the last output state until the instruction is reset.