CD600 Plus - User's Manual
4.56
Function 21 - Setpoint Generator (SPG)
Operation
The function of this block is to make a variable follow a pattern along the time, in accordance with a
pre-established curve selected by (
CLIN). The time variation is plotted along the axis X and the
variable is plotted along the axis Y. This variable is available at output "
O" of the block.
BLK 075/076
A
B
CD
DEVIATION
CURVE n
SP
t
REGISTER
TIME
PROGRAMMER
PAUSA RESET
PAUSE
107/109
229/230
108/110
DSP
END
SP
t
Output
t informs the time elapsed as percentage of the maximum time programmed for the pattern
(
CTME and CUNI).
When the configurated time is reached, output
"END" goes to a "high logic level", thus indicating the
end of the pattern. At this point, the time count stops in 100%, the variable stops in the value
corresponding to the maximum time and the output
"END" remain with high logic level until a high
logic level signal in input
D (RESET) returns the pattern to its initial point. The return of input D to a
low logic level restarts the pattern.
The pattern always starts in the point of axis X established by input
B. If nothing is connected to B or
the signal in
B is 0%, the pattern starts at t=0%. In case there is a signal of 25% connected to B and
the maximum programmed time is 2 min., the pattern starts in the point equivalent to 30 sec. (the 0
to 30 sec. track is suppressed).
This block also compares the value of the generated variable with the value of input
A. Should the
deviation be greater than the value adjusted in
ADEV, the time generation stops until A is back to
the allowable range. This function can be used to compare the Setpoint with the Process Variable.
Should the deviation be greater than an allowable range, the time stops running until the control is
effective again. If this function is not desirable, simply make
ADEV=100, or connect output "O" to
input "
A". Thus, there will be no deviation and the time generator will not be interrupted.
The time generator stops in two particular situations:
- When there is a high logic level at input
C (PAUSE).
- When the deviation between output
"O" and input A exceeds the adjusted limit value (parameter
ADEV).
The time count may be manually advanced or delayed with the keys <
Δ> and <∇> as long as the
time (outputs 229 or 230) is on the display.
Parameter
CLIN selects the curve or the curves of the General Loop which will be used to generate
the pattern. The curves are established in the
Function 31 - Linearization Curve (blocks 109 to
116)
. This curve may be used with 13, 26, 52, 78 or 104 pairs of points x, y, interconnected by
straight line segments. The curves that may be performed are shown on table 4.31.1 - page 4.59.
CUNI establishes the unit of time (hours or minutes) and CTME adjusts maximum time, i.e., the time
equivalent to X=100%.
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