9 PID OPERATION INSTRUCTION
9.1 Overview
1141
9
Derivative time (T
D
): (s3)+6
Setting range: 0 to 32767 [
10ms] (0 = no derivation)
PID control: Derivative action
The derivative time is used to be sensitive to the change in the process value (PV) caused by a disturbance and minimize the
changes.
• Increasing the derivative time (T
D
) prevents more positively the control target from fluctuating due to a disturbance.
Alarm output flag: (s3)+24
When the set input/output variation is exceeded, bits of (s3)+24 turn on as an alarm flag immediately after execution of the
PID operation instruction.
• When the input variation alarm (bit 1 of (s3)+1) is on
Derivative time (T
D
): T
D3
> T
D2
> T
D1
EV: Deviation
MV: Manipulated value
t: Time
PV: Process value
T
S
: Sampling time
t: Time
Bit 0 and bit 1 of (s3)+24: Alarm flag
T
D3
T
D1
T
D2
T
D3
T
D1
T
D2
EV
t
t
MV
EV
Disturbance
ON
ON
PV
t
T
S
Rate of change
(s3)+24 bit0
(s3)+24 bit1
Содержание MELSEC iQ-R Series
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Страница 24: ...22 INDEX 2092 INSTRUCTION INDEX 2093 REVISIONS 2104 WARRANTY 2105 TRADEMARKS 2106 ...
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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 ...
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