LSIS XBE-DC08A, User Manual

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Chapter 6 Built-in PID Function
6-33
6.6.4 Auto-tuning Flags
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 6.12.
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 hysteresis 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 6.12 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.