Chapter 10 Built-in PID Functions
10 - 19
(21) _PIDn_Td_lag (PID Td lag filter)
-
Setting
Area
K DEVICE AREA : K1051+32n
Unit : WORD [ 0 ~ 65535 ]
This sets the primary delay filter for the corresponding loop so as to allow the derivative effect acting as an
instantaneous impact to act more slowly and continuously. If the corresponding value is set high, the
derivative effect becomes smoother and, if it set to 0, the corresponding function does not operate. The
derivateive value leads the system output to low vibration and helps avoid a heavy load on the driver.
(22) _PIDn_AT_HYS_val (PID Auto-Tuning HYSteresis value)
- Setting Area
K DEVICE AREA : K1052+32n
Unit : INT [ -32768 ~ 32767 ]
This sets a directional deadband appropriate for AT. The _PIDn_AT_HYS_val value operates differently as
a upper deadband when PV increases and as a lower deadband when PV decreases. Proper setting of
this value is critical for successful AT. Setting _PIDn_AT_HYS_val is described in 10.7.4.
(23) _PIDn_AT_SV (PID Auto-Tuning SV)
- Setting Area
K DEVICE AREA : K1053+32n
Unit : INT [ -32768 ~ 32767 ]
This separately sets AT_SV to be used as SV for AT of the corresponding loop. AT enables PV to vibrate 3
times up and down around AT_SV.
(24) _PIDn_AT_step (PID Auto-Tuning step)
- Setting Prohibited
K DEVICE AREA : K1054+32n
Unit : INT [ -32768 ~ 32767 ]
This displays the AT operation state of the corresponding loop. _PIDn_AT_step has values from 0 to 7; 0
indicates “before AT operation” and 7 indicates “AT operation completed”. 1, 3 and 5 indicate the PV-
increasing areas and 2, 4 and 6 indicate the PV-decreasing area.
Caution
1)
Setting Prohibited
: The items marked with –
Setting Prohibited
are prohibited from being
set by the user. The corresponding area not only provides the user with
operational information but also stores information necessary for operations. A
random setting of the corresponding area causes the malfunction of the control
system.
2)
Input/Output Area
: _PIDn_PV and _PIDn_MV belong to
- Input/Output Area
, so use
them in a way they are connected to external equipment (AD, DA device).
