Drum
Instruction
Programming
6--12
Drum Instruction Programming
DL105 PLC User Manual, 3rd Edition
Drum Instruction
The Event Drum (EDRUM) features time-based and event-based step transitions. It
operates according to the general principles of drum operation covered in the
beginning of this chapter. Below is the instruction as displayed by
Direct
SOFT.
Discrete Output Assignment
Counter Number Step Preset
Timebase
Control
Inputs
Step Number
Counts per Step
Output Pattern
= Off, = On
Start
Reset
Jog
Event per step
EDRUM2
The Event Drum features 16 steps and 16 discrete outputs. Step transitions occur on
timed and/or event basis. The jog input also advances the step on each off-to-on
transition. Time is specified in counts per step, and events are specified as discrete
contacts. Unused steps must be programmed with “counts per step” = 0, and event =
“K0000”. The discrete output points may be individually assigned.
Whenever the Start input is energized, the drum’s timer is enabled. As long as the
event is true for the current step, the timer runs during that step. When the step count
equals the counts per step, the drum transitions to the next step. This process stops
when the last step is complete, or when the Reset input is energized. The drum
enters the preset step chosen upon a CPU program-to-run mode transition, and
whenever the Reset input is energized.
Drum Parameters
Field
Data Types
Ranges
Counter Number
aa
--
0 -- 74
Preset Step
bb
K
1 -- 16
Timer base
cccc
K
0.01 -- 99.99 seconds
Counts per step
dddd
K
0 -- 9999
Event
eeee
X, Y, C, S, T, CT
see page 4--29
Discrete Outputs
ffff
X, Y, C
see page 4--29
Event Drum
(EDRUM)
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