Process control instructions
942
Part
III F
P
Instructions
F355_PID_DUT
PID processing instruction
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
Data type
Function
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
Control
WORD
Range
Unit
SP
Set point value
0-10000
PV
Process value
0-10000
MV
Manipulated value
0-10000
LowerLimit
MV lower limit
0-10000
UpperLimit
MV upper limit
1-10000
Kp
Proportional gain
1-9999
0.1
Ti
Integral time
1-30000
0.1s
Td
Derivative time
1-10000
0.1s
Ts
Sampling time
1-6000
0.01s
AT_Progress
INT
Auto-tuning progress
0-5
Dummies
ARRAY
[11..30] OF
WORD
are utilized internally by
the PID controller
PLC types
Availability of F355_PID_DUT (see page
)
Variable
Data type
Function
s
PID_DUT_31
Detailed explanation of parameters
For
Relay
T/C
Register
Constant
s
- - WR
WL SV EV DT LD FL
-
Description
The PID processing instruction is used to regulate a process (e.g. a heater) given a measured
value (e.g. temperature) and a predetermined output value (e.g. 20°C).
Data types
Operands
Содержание FP Series
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