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hunting will be reduced if the integral time is increased or the proportional band
is enlarged.
Control by measured PID
(when loose hunting occurs)
Enlarge I or P.
SV
•
If the period is short and hunting occurs, it may be that the control system re-
sponse is quick and the derivative operation is too strong. In that case, set the
derivative operation lower.
Control by measured PID
(when hunting occurs in a short period)
Lower D.
SV
Flags
ER:
Content of
:
DM word is not BCD, or the DM area boundary has been
exceeded.
A PID parameter SV is out of range.
The PID operation was executed but the cycle time was two times the
sampling period. PID(––) will be executed for this error only even when
ER (SR25503) is ON.
CY:
The PID operation is being executed.
Example
This example shows a PID control program using PID(––).
Amplifier (See note below.)
Fan (Output word IR 111)
Heater (Output word IR110)
Temperature sensing element
(Output word IR 100)
Amplifier (See note below.)
#0
#1
AD001
DA001
C200HS
CPU
Note Motors and heaters cannot be directly connected from a Analog Output Unit. An
amplifier (i.e., a current amplification circuit) is required.
Special Math Instructions
Section 5-21
Содержание SYSMAC C200HS
Страница 1: ...Cat No W235 E1 05 C200HS SYSMAC Programmable Controllers...
Страница 2: ...C200HS Programmable Controllers Operation Manual Revised February 2002...
Страница 3: ...iv...
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Страница 379: ...371 SR word Corresponding key s Bit 279 03 04 05 3 06 07 VER 08 09 Monitoring Operation and Modifying Data Section 7 1...
Страница 470: ...468 Programmer Program Date Page Word Contents Notes Word Contents Notes Data Storage...
Страница 471: ...469 Programmer Program Date Page TC address T or C Set value Notes TC address T or C Set value Notes Timers and Counters...