1134
9 PID OPERATION INSTRUCTION
9.1 Overview
9
PID OPERATION INSTRUCTION
PID operation instruction and PID control instruction
There are two types of instructions for PID control.
The following table lists the specifications comparison between PID operation instruction and PID control instruction.
9.1
Overview
This section describes an overview of PID control using the PID operation instruction.
PID operation instruction
The PID operation instruction calculates the manipulated value (MV) from the process value (PV) by combining the P action
(proposal action), I action (integral action), and D action (derivative action) to get closer to the set value (SV).
■
Alarm output function
This function turns on the alarm output for the variations of input (process value) and output (manipulated value).
■
Output upper/lower limit value setting
This function suppresses the increase of integral terms in PID control by setting the output upper/lower limit values.
■
Auto tuning function
This function automatically sets the proportional gain (K
P
), integral time (T
I
), and derivative time (T
D
). The auto tuning is
performed in two methods: limit cycle method and step response method.
■
Operation method of the PID operation instruction
The instruction performs PID operation in the velocity type or the process value derivative type.
Type
Application
Reference (Overview)
Reference (Details)
PID operation
instruction
This instruction is used to perform PID control using auto
tuning.
Page 1145 PID Operation Instruction
PID control
instruction
This instruction is used to perform PID control equal to that of
the MELSEC-Q series and MELSEC-L series.
Page 1158 PID Control Instructions
(Inexact Differential),Page 1170 PID
Control Instructions (Exact Differential)
Item
PID operation instruction
PID control instruction
PID operation method
Inexact differential
Inexact differential/exact differential
Sampling period/sampling time
1 to 32767ms
10 to 60000ms
Number of control loops
1 loop per instruction
32 loops maximum
Auto tuning
Enabled (limit cycle method and step response
method)
Disabled
Содержание MELSEC iQ-R Series
Страница 1: ...MELSEC iQ R Programming Manual Instructions Standard Functions Function Blocks ...
Страница 2: ......
Страница 24: ...22 INDEX 2092 INSTRUCTION INDEX 2093 REVISIONS 2104 WARRANTY 2105 TRADEMARKS 2106 ...
Страница 34: ...32 MEMO ...
Страница 35: ...33 PART 1 PART 1 OVERVIEW This part consists of the following chapter 1 OVERVIEW ...
Страница 68: ...66 1 OVERVIEW 1 5 Precautions on Programming MEMO ...
Страница 204: ...202 5 SEQUENCE INSTRUCTIONS 5 3 Output Instructions Operation error There is no operation error ...
Страница 470: ...468 6 BASIC INSTRUCTIONS 6 6 Data Conversion Instructions Operation error There is no operation error ...
Страница 472: ...470 6 BASIC INSTRUCTIONS 6 6 Data Conversion Instructions Operation error There is no operation error ...
Страница 479: ...6 BASIC INSTRUCTIONS 6 6 Data Conversion Instructions 477 6 Operation error There is no operation error ...
Страница 504: ...502 6 BASIC INSTRUCTIONS 6 7 Data Transfer Instructions Operation error There is no operation error ...
Страница 518: ...516 6 BASIC INSTRUCTIONS 6 7 Data Transfer Instructions Operation error There is no operation error ...
Страница 520: ...518 6 BASIC INSTRUCTIONS 6 7 Data Transfer Instructions Operation error There is no operation error ...
Страница 754: ...752 7 APPLICATION INSTRUCTIONS 7 9 Real Number Instructions Operation error There is no operation error ...
Страница 756: ...754 7 APPLICATION INSTRUCTIONS 7 9 Real Number Instructions Operation error There is no operation error ...
Страница 758: ...756 7 APPLICATION INSTRUCTIONS 7 9 Real Number Instructions Operation error There is no operation error ...
Страница 760: ...758 7 APPLICATION INSTRUCTIONS 7 9 Real Number Instructions Operation error There is no operation error ...
Страница 895: ...7 APPLICATION INSTRUCTIONS 7 16 Ramp Signal Instruction 893 7 Operation error There is no operation error ...
Страница 917: ...7 APPLICATION INSTRUCTIONS 7 20 Data Processing Instructions 915 7 Operation error There is no operation error ...
Страница 919: ...7 APPLICATION INSTRUCTIONS 7 20 Data Processing Instructions 917 7 Operation error There is no operation error ...
Страница 1415: ...13 SFC PROGRAM INSTRUCTIONS 13 1 SFC Control Instructions 1413 13 Operation error There is no operation error ...
Страница 1448: ...1446 14 REDUNDANT SYSTEM INSTRUCTIONS 14 2 Disabling Enabling System Switching MEMO ...
Страница 1795: ...25 TYPE CONVERSION FUNCTIONS 25 1 Converting BOOL to WORD 1793 25 Operation error There is no operation error ...
Страница 1805: ...25 TYPE CONVERSION FUNCTIONS 25 10 Converting WORD to DINT 1803 25 Operation error There is no operation error ...
Страница 1819: ...25 TYPE CONVERSION FUNCTIONS 25 21 Converting INT to DWORD 1817 25 Operation error There is no operation error ...
Страница 1950: ...1948 32 STRING FUNCTIONS 32 2 Extracting String Data From the Left Right Operation error There is no operation error ...
Страница 1972: ...1970 33 TIME DATA TYPE FUNCTIONS 33 4 Division MEMO ...
Страница 2067: ...APPX Appendix 5 PID Control Program Examples 2065 A 252 Set PID control data for loop 2 ...
Страница 2082: ...2080 APPX Appendix 6 Process Control Program Examples 129 Set the default value of the loop tag ...
Страница 2093: ...APPX Appendix 7 List of Loop Tag Memory Areas Used by Process Control Instructions 2091 A MEMO ...
Страница 2109: ......