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772
Data Control Instructions
Section 3-18
Description
When the execution condition is ON, PIDAT(191) carries out target value fil-
tered PID control with two degrees of freedom according to the parameters
designated by C (set value, PID constant, etc.). It takes the specified input
range of binary data from the contents of input word S and carries out the PID
action according to the parameters that are set. The result is then stored as
the manipulated variable in output word D.
The parameter settings are read when the execution condition turns from OFF
to ON, and the Error Flag will turn ON if the settings are outside of the permis-
sible range.
If the settings are within the permissible range, PID processing will be exe-
cuted using the initial values. Bumpless operation is not performed at this
time. It will be used for manipulated variables in subsequent PID processing
execution. (Bumpless operation is processing that gradually and continuously
changes the manipulated variable in order to avoid the adverse effects of sud-
den changes.)
When the execution condition turns ON, the PV for the specified sampling
period is entered and processing is performed.
Autotuning
The status of the AT Command Bit (bit 15 of C+9) is checked every cycle. If
this control bit is turned ON in a given cycle, PIDAT(191) will begin autotuning
the PID constants. (The changes in the SV will not be reflected while autotun-
ing is being performed.)
The limit-cycle method is used for autotuning. PIDAT(191) forcibly changes
the manipulated variable (max. manipulated variable
↔
min. manipulated
variable) and monitors the characteristics of the controlled system. The PID
constants are calculated based on the characteristics that were observed,
EM Area with bank
En_00000 to
En_32767
(n = 0 to C)
En_00000 to
En_32729
(n = 0 to C)
En_00000 to
En_32767
(n = 0 to C)
Indirect DM/EM
addresses in binary
@ D00000 to @ D32767
@ E00000 to @ E32767
@ En_00000 to @ En_32767
(n = 0 to C)
Indirect DM/EM
addresses in BCD
*D00000 to *D32767
*E00000 to *E32767
*En_00000 to *En_32767
(n = 0 to C)
Constants
DR0 to DR15
---
DR0 to DR15
Data Registers
---
Index Registers
---
Indirect addressing
using Index Registers
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
Area
S
C
D
Parameters (C to C+8)
Manipulated variable (D)
PV input (S)
PID control
Содержание SYSMAC CS1D-CPU**
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Страница 185: ...146 List of Instructions by Function Code Section 2 4...
Страница 193: ...154 3 35 4 MOVE BIT MOVBC 568 1274 3 35 5 BIT COUNTER BCNTC 621 1276 3 35 6 GET VARIABLE ID GETID 286 1278...
Страница 1389: ...1350 CJ series Instruction Execution Times and Number of Steps Section 4 2...
Страница 1390: ...1351 Appendix A ASCII Code Table ASCII SP Four leftmost bits Four rightmost bits...
Страница 1391: ...1352 ASCII Code Table Appendix A...