8400 StateLine C | Reference manual
Function library
Function blocks | L_PCTRL_1
842
L
Firmware
≤
11.00 - DMS 8.0 EN - 10/2011
16.1.39.2 Ramp function generator
The PID output is led via a ramp function generator with linear characteristic. This serves
to transfer setpoint step-changes at the PID output into a ramp which should be as steep
as possible.
[16-19] Acceleration and deceleration times
t
ir
and t
if
are the desired times for changing between w1 and w2.
The ramps for acceleration and deceleration can be set individually.
–
C00227
: Acceleration time t
ir
–
C00228
: Deceleration time t
if
The t
ir
/t
if
values are converted into the required Ti times according to the following
formula:
The ramp function generator is immediately set to "0" by setting
bInAct
to TRUE.
16.1.39.3 Operating range of the PID process controller
The value range of the input signal
nSet_a
and thus the operating range of the PID process
controller can be limited with the following parameters:
C00231/1
: Pos. maximum (default setting: 199.99 %)
C00231/2
: Pos. minimum (default setting: 0.00 %)
C00231/3
: Neg. minimum (default setting: 0.00 %)
C00231/4
: Neg. maximum (default setting: 199.99 %)
w1, w2 = change of the main setpoint as a function of t
ir
and t
if
RFG-OUT = output of the ramp function generator
RFG-OUT
100 %
w2
w1
t
0 %
t
ir
t
ir
T
ir
T
ir
T
ir
t
ir
100 %
w2 w1
–
----------------------
⋅
=
T
if
t
if
100 %
w2 w1
–
----------------------
⋅
=
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