Process control instructions
947
Part
III F
P
Instructions
When bRunPidControl turns on, the work area specified with the F356_Parameters_NonHold_DUT
(see page 949) will be initialized. However, only the member
MV (manipulated value) can be held
depending on the status of the flag
b2_HoldMV of F356_Control_DUT (see page 948).
The default control conditions are:
Cycle time = 1s
Inverse I-PD control (heating)
PWM resolution = 1000.
PID control starts from the next scan, and PWM output is executed for
PWM_Output
.
If the member flag
b0_AT_Request
of
ControlData
, a DUT with overlapping elements, is set,
auto-tuning begins. When auto-tuning has completed successfully, the member flag
b1_AT_Complete
of
ControlData
is set and Kp, Ti and Td are set for the PID control. If
bRunPidControl
is still on, it will change to PID control automatically and the PWM output will be
executed.
If the execution condition bRunPidControl has turned to FALSE during PID
control, PWM_Output also turns off. However, only the member MV
(manipulated value) can be held depending on the status of the flag b2_HoldMV
of F356_Control_DUT (see page
).
Example
In this example, the same POU header is used for all programming languages.
GVL
In the global variable list, all values of global inputs and outputs are declared that are used for
programming this function.
POU header
All input and output variables used for programming this function have been declared in the POU
header.
Body
Specify the member SP (set point value) of F356_Parameters_Hold_DUT (see page 948) before
operation.
LD
Содержание FP Series
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