AutomationDirect DL105, Руководство пользователя

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Drum
Instruction
Programming
6--7
Drum Instruction Programming
DL105 PLC User Manual, 3rd Edition
The last step in a drum sequence may be any step number, since partial drums are
valid. Refer to the following figure. When the transition conditions of the last step are
met, the drum sets the counter bit corresponding to the counter named in the drum
instruction box (such as CT0). Then it moves to a final “drum complete” state. The
drum outputs remain in the pattern defined for the last step. Having finished a drum
cycle, the Start and Jog inputs have no effect at this point.
The drum leaves the “drum complete” state when the Reset input becomes active (or
on a program-to--run mode transition). It resets the drum complete bit (such as CT0),
and then goes directly to the appropriate step number defined as the preset step.
Are transition
conditions met?
F F F
f f f F f f F f F F F f F
Last step
Outputs:
F F F
f f f F f f F f F F F f F
Complete
Outputs:
No
Yes
Go to Preset Step
Set
CT0 = 1
Reset Input
Active?
No
Yes
Reset
CT0 = 0
(Timer and/or
Event criteria)
Set Drum Complete bit
Reset Drum Complete bit
Last Step
Completion