LSIS XBF-AH04A

Chapter 15 PID Function (Built-in function)
15 - 37
15.4.4 Auto-tuning flag
The parameters set in the XGB series auto-tuning function are saved to the flash memory of basic unit.
Such parameters are moved to K area for auto-tuning function as soon as PLC enters to RUN mode
from STOP. Auto-tuning operation using auto-tuning command is achieved by data in K area. At the
moment, if PLC is changed to RUN again after being changed to STOP, it takes the parameters in
flash memory to K area, so the data changed in K area is lost. Therefore, to continuously apply the
parameters adjusted in K area, it is necessary to write the parameters set in K area into flash memory
by using WRT command. (In case of IEC type, APM_WRT function block)
(1) Auto-tuning flag configuration
The K area flags of XGB series auto-tuning function are summarized in Table 15.12.
Loops
K area
IEC type
Symbol
Data type
Default
Description
Common
K18560~F
%KX29696
~%KX29711
_AT_REV
Bit
Forward
Auto-tuning direction(0:forward,
1:reverse)
K18570~F
%KX29712
~%KX29727
_AT_PWM_EN
Bit
Disable
PWM output enable(0:disable,
1:enable)
K18580~F
%KX29728
~%KX29743
_AT_ERROR
Bit
-
Auto-tuning
error(0:normal,1:error)
K1859
%KW1859
Reserved
WORD
-
Reserved area
Loop0
K1860
%KW1860
_AT00_SV
INT
0
AT SV – loop 00
K1861
%KW1861
_AT00_T_s
WORD
100
AT operation cycle
(T_s)[0.1msec]
K1862
%KW1862
_AT00_MV_max
INT
4000
AT MV max. value limit
K1863
%KW1863
_AT00_MV_min
INT
0
AT MV min. value limit
K1864
%KW1864
_AT00_PWM
WORD
0
AT PWM junction setting
K1865
%KW1865
_AT00_PWM_Prd
WORD
0
AT PWM output cycle
K1866
%KW1866
_AT00_HYS_val
WORD
0
AT hysterisis setting
K1867
%KW1867
_AT00_STATUS
WORD
0
AT auto-tuning status indication
K1868
%KW1868
_AT00_ERR_CODE
WORD
0
AT error code
K1869
%KD
_AT00_K_p
REAL
0
AT result proportional coefficient
K1871
-
_AT00_T_i
REAL
0
AT result integral time
K1873
-
_AT00_T_d
REAL
0
AT result differential time
K1875
-
_AT00_PV
INT
0
AT PV
K1876
-
_AT00_MV
INT
0
AT MV
K1877~1879
%KW1877
~%KW1879
Reserved
Word
0
Reserved area
[Table 15.12 K area flags for auto-tuning]
K1856 ~ K1859 areas (In case of IEC type, %KW1856~%KW1859) are the common bit areas for
auto-tuning and each bit represents auto-tuning loop status respectively. K1860~K1879 areas save
the setting and status of loop 0 as the K area for auto-tuning loop 0. In the area, the parameters
such as PV, operation cycle and etc set in the built-in parameter window are saved and the XGB
built-in auto-tuning function executes auto-tuning by the device values and saves the results into the
K areas.