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EMC V2.4 Integrator Manual
27.7.3
Chapter 27. Classic Ladder
TIMERS
Represent count down timers. This is deprecated and replaced by IEC Timers.
Timers have 4 contacts.
• E = enable (input) - starts timer when true, resets when goes false
• C = control (input) - must be on for the timer to run (usually connect to E)
• D = done (output) - true when timer times out and as long as E remains true
• R = running (output) - true when timer is running
The timer base can be multiples of milliseconds, seconds, or minutes.
There are also Variables for timers that can be read and/or written to in compare or operate blocks.
• %Txx.R : Timer xx running (Boolean, read only)
• %Txx.D : Timer xx done (Boolean, read only)
• %Txx.V : Timer xx current value (integer, read only)
• %Txx.P : Timer xx preset (integer, read or write)
27.7.4
MONOSTABLES
Represent are one-shot timers. This is deprecated and replaced by IEC Timers.
Monostables have 2 contacts I and R.
• I (input) -input -will start the mono timer running.
• R (output) -running -will be true while timer is running.
The I contact is rising edge sensitive meaning it starts the timer only when changing from false to
true (or off to on). While the timer is running the I contact can change with no effect to the running
timer. R will be true and stay true till the timer finishes counting to zero. The timer base can be
multiples of milliseconds, seconds, or minutes.
There are also Variables for monostables that can be read and/or written to in compare or operate
blocks.
• %Mxx.R : Monostable xx running (Boolean, read only)
• %Mxx.V : Monostable xx current value (integer, read only)
• %Mxx.P : Monostable xx preset (integer, read or write)
27.7.5
COUNTERS
- Represent up/down counters.
- There are 7 contacts:
• R (input) -reset -will reset the count to 0.
• P (input) -preset -will set the count to the preset number assigned from the edit menu.
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