Delta AS Series Programming Manual page 483

AS Ser ies Pro gra mm in g M anu al
Operand
Td_Kd
Tf
PID_EQ
_6
PID_DE
PID_DIR
ERR_DBW
6 - 2 0 4
Data type Function
Derivative coefficient (Td or Kd,
REAL according to the settings in
PID_EQ)
REAL Derivate-action time constant
BOOL PID formula types
The calculation of the PID
BOOL
derivative error
BOOL PID forward/reverse direction
Range within which the error
REAL
value is counted as 0.
Setting range Description
Range of If the calculated
positive coefficient D is less
single- than 0, Td_Kd is 0. If
Ti_Ki is 0, it is not
precision
controlled by D.
floating-
point
numbers
(unit: sec)
Range of If the derivate-action
positive time constant is less
single- than 0, Tf is 0 and it is
not controlled by the
precision
derivate-action time
floating-
constant (derivative
point
smoothing).
numbers
(unit: sec)
TRUE: dependent formula
FALSE: independent formula
TRUE: use the variations in the PV to
calculate the control value of the
derivative (Derivative of the PV).
FALSE: use the variations in the error
(E) to calculate the control value
of the derivative (derivative of
the error).
True: forward action (E=SV-PV)
False: reverse action (E=PV-SV)
The error value (E) is
Range of
the difference
single-
between the SV and
precision
the PV. When the
floating-
setting value is 0, the
point
function disabled;
numbers
otherwise the CPU