AutomationDirect DL105, Руководство пользователя

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Drum
Instruction
Programming
6--4
Drum Instruction Programming
DL105 PLC User Manual, 3rd Edition
Step Transitions
EDRUM operation in the F1--130 includes the following features:
S
Up to 16 steps
S
Time-based step transitions
S
Event-based step transitions
S
Up to 16 discrete outputs per drum (X, Y, or C type)
The EDRUM has 16 steps, and each step has 16 outputs. Refer to the figure below.
Each output can be either an X, Y, or C coil, offering a lot of programming flexibility.
We assign Step 1 an arbitrary unique output pattern (
f
= Off,
F
= On) as shown.
When programming the EDRUM instruction, you also determine both the output
assignment and the On/Off state (pattern) at that time. All steps use the same output
assignment, but each step may have its own unique output pattern.
Drums move from one step to another based on time and/or an external event
(input). Each step has its own transition condition which you assign during the drum
instruction entry. The figure below shows how timer-only transitions work.
F
f f f
F f F f f f f F F f f f
Step 1 Outputs:
f f f F f f f f F F f F f f F F
Step 2 Outputs:
Has counts per
step expired?
No
Yes
Increment
count timer
Use next transition criteria
The drum stays in Step 1 for a specific duration (user-programmable). The timebase
of the timer is programmable, from 0.01 seconds to 99.99 seconds. This establishes
the resolution, or the duration of each “tick of the clock”. Each step uses the same
timebase, but has its own unique counts per step, which you program. When the
counts for Step 1 have expired, then the drum moves to Step 2. The outputs change
immediately to match the new pattern for Step 2.
The drum spends a specific amount of time in each step, given by the formula:
Time in step = 0.01 seconds X Timebase x Counts per step
Drum Instruction
Parameters
Timer-Only
Transitions