Process control instructions
946
Part III FP Instructions
PLC types Availability of F356_PID_PWM (see page 1325)
The period (cycle) of the PWM output is the sampling time Ts (the frequency of
the PWM output is 1/Ts) and the duty is the manipulated value MV in 0.01% units,
e.g. MV = 10000 means a duty of 100%.
Variable Data type Function
Run BOOL Start condition
Control F356_Control_DUT (see page
948)
Control data
Parameters
Hold
F356_Parameters_Hold_DUT
(see page 948)
PID control parameters
Parameters
NonHold
F356_Parameters_NonHold_DUT
(see page 949)
Manipulated value MV, additional control
mode area, auto-tuning related area and
w
orking area
ProcessValue INT Process value (-30000–30000)
PWM_Output
(see note)
BOOL Pulse-width modulated output (optional,
instead of manipulated value output)
For Relay T/C Register Constant
Control - WY WR WL SV EV DT LD FL -
Parameters WX WY WR WL SV EV DT LD FL -
Process
Values
- WY WR WL SV EV DT LD FL -
No. IEC address Set If
R9007 %MX0.900.7 permanently
R9008 %MX0.900.8 for an instant
any parameter of
F356_Parameters_NonHold_DUT is out
of range
R900B %MX0.900.11 permanently the area specified with UpperLimit or
LowerLimit is out of range
Detailed information:
Control conditions: F356_Parameters_Hold_DUT (see page 948)
Set point value SP and the control param
eters:
F356_Parameters_NonHold_DUT (see page 949)
Additional notes on auto-tuning
The
members AT_Progress in F356_Parameters_NonHold_DUT (see page
949) and b1_AT_Complete in F356_Con
trol_DUT (see page 948) are cleared at
the rising edge of the auto-tuning signal.
When auto-tuning has completed successfully, the element b1_AT_Complete of
F356_Control_DUT (see page 948) is set, and the auto-tuning done code is
stored in the
element AT_
Progress of F356_Parameters_NonHold_DUT (see
page 949).
When auto
-tuning is aborted, the parameters of Kp, Ti, and Td are not changed.
Data types
Operands
Error flags