Delta AS Series Programming Manual page 757

AS Ser ies Pro gra mm in g M anu al
Operand
PID_DE
PID_DIR
_6
ERR_DBW
6-478
Data type
The calculation of the PID
BOOL
derivative error
BOOL PID forward/reverse direction
Range within which the error
DWORD/DINT
value is counted as 0.
Function Setting range
FALSE: independent formula
TRUE: use the variations in the PV to
FALSE: use the variations in the error
TRUE: forward action; cooling down
FALSE: reverse action; heating up
-32768~32767
Description
calculate the control value of
the derivative (Derivative of the
PV).
(E) to calculate the control
value of the derivative
(derivative of the error).
(E=PV-SV)
(E=SV-PV)
The error value
(E) is the
difference
between the SV
and the PV.
When the
ERR_DBW
setting value is 0,
the function is
disabled;
otherwise the
CPU PLC checks
whether the
present error is
less than the
absolute value of
ERR_DBW, and
checks whether
the present error
meets the cross
status condition.
If the present