240 Parameters
40.34 Set 1 derivation time Defines the derivation time of the process PID controller.
The derivative component at the controller output is
calculated on basis of two consecutive error values (E
K-
1
and E
K
) according to the following formula:
PID DERIV TIME × (E
K
- E
K-1
)/T
S
, in which
T
S
= 2 ms sample time
E = Error = Process reference - process feedback.
0.000 s
0.000…10.000 s Derivation time. 1000 = 1 s
40.35 Set 1 derivation filter
time
Defines the time constant of the 1-pole filter used to
smooth the derivative component of the process PID
controller.
0.0 s
0.0…10.0 s Filter time constant. 10 = 1 s
40.35 Set 1 output min Defines the minimum limit for the process PID controller
output. Using the minimum and maximum limits, it is
possible to restrict the operation range.
-32768.0
-32768.0… 32767.0 Minimum limit for process PID controller output. 1 = 1
40.37 Set 1 output max Defines the maximum limit for the process PID controller
output. See parameter 40.35 Set 1 output min.
32767.0
-32768.0… 32767.0 Maximum limit for process PID controller output. 1 = 1
40.38 Set 1 output freeze
enable
Freezes (or defines a source that can be used to freeze)
the output of the process PID controller, keeping the
output at the value it was before freeze was enabled. This
feature can be used when, for example, a sensor
providing process feedback must to be serviced without
stopping the process.
1 = Process PID controller output frozen
See also parameter 40.30 Set 1 setpoint freeze enable.
Not selected
Not selected Process PID controller output not frozen. 0
Selected Process PID controller output frozen. 1
DI1 Digital input DI1 (10.02 DI delayed status, bit 0). 2
DI2 Digital input DI2 (10.02 DI delayed status, bit 1). 3
DI3 Digital input DI3 (10.02 DI delayed status, bit 2). 4
No. Name/Value Description Default
FbEq 16
63
%
100
T
t
O = I × (1 - e
-t/T
)
I = filter input (step)
O = filter output
t = time
T = filter time constant
Unfiltered signal
Filtered signal
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