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Process control instructions
F355_PID_DUT
The PID processing instruction is used to regulate a process (e.g. a heater) given a measured
Description
value (e.g. temperature) and a predetermined output value (e.g. 20°C).
The function calculates a PID algorithm whose parameters are determined in a data table in the
form of an ARRAY with 30 elements that is entered at input s.
The required data table PID_DUT_31 contains the following parameters (for details, please refer to
the DUT PID_DUT_31 in the online help):
Parameter
Control
SP
PV
MV
LowerLimit
UpperLimit
Kp
Ti
Td
Ts
AT_Progress
Dummies
PLC types
Availability of F355_PID_DUT (see page 1325)
Data types
Variable
Data type
PID_DUT_31
s
Operands
For
-
s
942
PID processing instruction
Data type
Function
WORD
Control mode
16#X000 Inverse PI-D control
16#X001 Forward PI-D control
16#X002 Inverse I-PD control
16#X003 Forward I-PD control
INT
Set point value
Process value
Manipulated value
MV lower limit
MV upper limit
Proportional gain
Integral time
Derivative time
Sampling time
Auto-tuning progress
ARRAY
are utilized internally by
[11..30] OF
the PID controller
WORD
Function
Detailed explanation of parameters
Relay
T/C
-
WR
WL
SV
EV
Range
Unit
0-10000
0-10000
0-10000
0-10000
1-10000
1-9999
0.1
1-30000
0.1s
1-10000
0.1s
1-6000
0.01s
0-5
Register
Constant
DT
LD
FL
-
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