XGB Analog edition manual
15 - 30
(3) PIDHBD
PIDHBD is a command to execute the mixed forward/reverse E control.
- Operand F and R represent forward operation loop and reverse operation loop and available
only for constant(0~15).
- If start junction is on, it starts the mixed forward/reverse operation from the designated
forward/reverse loops.
- In case of IEC type, combined operation is executed by using PIDHBD function block
The mixed forward/reverse control is called a control method to control forward operation control
output and reverse operation control operation alternatively to a single control process. The XGB
built-in PID control enables the mixed forward/reverse control by connecting two PID control loops
set as forward/reverse operations. At the moment, it uses PIDHBD command. For more information
about the command, refer to 15.2.5. The mixed forward/reverse run is executed as follows in the
XGB built-in PID control.
(a) Commencement of mixed run
If PIDHBC command starts first, it starts reverse run when PV is higher than SV; it starts
forward run if PV is lower than SV.
(b) Conversion of RUN direction
The conversion of run direction is executed according to the following principles. In case of
forward operation run, it keeps running by converting to reverse operation once PV is over SV
+ DeadBand value. At the moment, the DeadBand setting value uses the deadband of a loop
set for forward operation. If PV is below SV – DeadBand value during reverse operation, it also
keeps running by converting to forward operation. In the case, the DeadBand setting uses the
deadband of a loop set for reverse loop. It may be illustrated as 15.14.
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