DIQ/S 28X
Outputs
149
ba77168d02
03/2017
Settings
7.7.2
PID controller
Function
The
PID controller
function can use an output as a controller output. The regu-
lator can be configured as a
P
roportional regulator with switchable
I
ntegral and
D
ifferential regulator parts (
PID
Controller).
The control response of the PID controller is described by the following formula:
Setting
Selection/Values
Explanation
Recorder type
0 to 20 mA or
4 to 20 mA
Start value
(sensor depen-
dent)
Minimum spacing:
≤
5 % of the measuring range
(sensor-dependent)
End value
Measured variable
Main variable
Adjoining variable
Main variable
designates the
actual measured parameter of
the sensor (e.g. pH, oxygen,
etc.).
Adjoining variable
designates an
additional measured parameter
(e.g. temperature).
Attenuation
0 ... 40 mA/s
Speed of change of the output
current (mA/s) in the case of
erratic changes of the input sig-
nal.
I -> UFL/OFL
Error
Current values outside the range
between
Start value
and
End
value
are regarded as an error.
The current output reacts as
specified under
Behavior at error
(see below).
Limitation
The current at the output is lim-
ited to the
Start value
or
End
value
.
Behavior at error
Fixed current
value
In the case of system errors and
sensor errors, the current output
delivers the fixed current value
that was specified.
Possible values:
0 ... 21 mA.
Unchanged
The current at the output remains
unchanged.
Summary of Contents for DIQ/S 282
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