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Chapter 15 PID Function (Built-in function)
15 - 1
Chapter 15 PID Function (Built-in function)
15. 1General
15.1.1 General
Here describes built-in PID (Proportional Integral Derivative) function. When there is plant (target of control),
Control means that the user changes the status such as velocity, temperature, position, voltage, current etc.
as the user wishes. Here describes PID control that is most frequently used among diverse control methods.
Basic concept of PID control is as follows. First, it detects the PV (Process Value) through sensor and
calculates what the difference with SV (Set value) is. Then it outputs MV (Manipulated Value) for PV to be
same with SV.
At this time, 3 types of operation, such as Proportion, Integration, Derivation is executed according to the
requirement of the user. PID control has high compatibility, flexibility, affordability in comparison with Robust
control and Linear optimal control. In case of other control methods, since control device can be applied to
the system after mathematical analysis of system, if system or the requirement of the user changes, the
analysis of system is done again. But in case of PID control, PID device copes with change of system or
requirement of the user with simple auto-tunings without analysis of system rapidly.
The figure 6.1 is example indicating system configuration of temperature control of heating system.
< Figure 15.1 PID Temperature control system with PLC >
At this time, PLC becomes control device for this system, output temperature of heating system becomes
target for control. And temperature sensor and valve becomes devices to detect and manipulate the status
of system respectively. If temperature sensor detects the output temperature and inputs that to PLC, PLC
manipulate the valve status through PID operation and control the quantity of gas that goes into heating
system. So temperature of heating system changes. This process is called control loop and PID control is
executed by repeating the control loop. The control loop is repeated with a cycle of ms ~ s.
Содержание XGB Series
Страница 70: ...XGB Analog edition manual 2 36 Program in case of IEC type ...
Страница 72: ...XGB Analog edition manual 2 38 ...
Страница 73: ...Chapter 2 Analog Input Module XBF AD04A 2 39 Program in case of IEC type ...
Страница 134: ...Chapter 4 RTD Input Module XBF RD04A XBF RD01A 4 Program example using PUT GET function block inn case of IEC 4 27 ...
Страница 340: ...XGB Analog edition manual e Select View Variable Comments Variable and comment both are displayed 9 20 ...
Страница 491: ...XGB Analog edition manual 4 Click Yes 5 As shown below the variables are registered 13 30 ...
Страница 494: ...Chapter 13 Analog Input Module XBF AD04C 4 Select View Device Comments Devices and comments are both displayed 13 33 ...
Страница 495: ...XGB Analog edition manual 5 Select View Variables Comments Variables and comments are both displayed 13 34 ...
Страница 546: ...XGB Analog edition manual 4 Program example using PUT GET instruction in case of IEC type 14 38 ...
Страница 581: ...XGB Analog edition manual 15 32 In case of IEC type APM_WRT funcion block is used ...
Страница 597: ...XGB Analog edition manual 15 48 d In case of IEC type example program In case of IEC type the following program is used ...
Страница 607: ...Appendix 2 Thermo electromotive force and compensating force Appendix 2 2 Type T Type R unit unit ...
Страница 611: ...Appendix 3 Appendix 3 1 Appendix 3 Dimension 1 Dimension of XBF AD04A Unit mm 2 Dimension of XBF DV04A DV04C Unit mm ...
Страница 613: ...Appendix 3 Appendix 3 3 5 Dimension of XBF TC04S Unit mm 6 Dimension of XBF AH04A Unit mm V I XBF AH04A ...
Страница 614: ...Appendix 3 Appendix 3 4 7 Dimension of XBF AD08A Unit mm 8 Dimension of XBO AD02A Unit mm ...
Страница 615: ...Appendix 3 Appendix 3 5 9 Dimension of XBO DA02A Unit mm 10 Dimension of XBO AH02A Unit mm ...
Страница 616: ...Appendix 3 Appendix 3 6 11 Dimension of XBO RD01A Unit mm 12 Dimension of XBO TC02A Unit mm ...