Chapter 6 FBD Block Diagram Programming 191
AR (Analog-Ramp) function block
There is a maximum of 30 AR (analog ramp control) function blocks under FBD mode, and the function is same as
Ladder mode.
(1)AR mode1
Function description:
AR will keep the current level at “StSp + Offset "B"” for 100ms when it’s
enabled. Then the current level runs from StSp + Offset "B" to target level at
enactment Rate. If St is set, the current level decreases from current level to
level StSp + B at enactment Rate. Then AR holds the level StSp + Offset "B" for
100ms. After 100ms, AR current level is set to offset "B", which makes AR
current value equals 0.
ABlevelcurrentARvaluecurrentAR /)__(__ −=
The parameters can be constant or other function current value.
Selection level Sel = 0: target level = Level1
Sel = 1: target level = Level2
※ MaxL is used as target level if the selected level is bigger than MaxL.
Selection stop coil. The St’s state becomes from 0 to 1 will startup the current level decrease
to start/stop level (StSp + excursion “B”), and then keep this level for 100ms. Then AR
current level is set to B which will make AR current value equals 0.
The output coil turns ON when Proportion (A) is 0.
Timing diagram for AR
AR current value: 0~32767
MaxL (max level):-10000~20000
Start/Stop level (StSp): 0~20000
stepping rate (rate): 1~10000
Excursion (B): -10000~10000
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