Delta AS Series Programming Manual page 480

Operand Data type
PID_RUN BOOL
SV REAL
REAL
PV
PID_MODE DWORD/DINT PID control mode
Function
Enabling the PID algorithm
SV
PV
Ch ap te r 6 Ap pl ie d Instruc ti ons
Setting range Description
True: use the PID algorithm.
False: reset the output value (MV) to 0,
and stop using the PID algorithm.
Range of
single-
precision
Target value
floating-
point
numbers
Range of
single-
precision
Process value
floating-
point
numbers
0: Automatic control
When PID_MAN switches from True
to False, invoke the output value
(MV) in the automatic algorithm. If
the MV exceeds the limits of
MV_MAX or MV_MIN, I_MV value
stays the same and without
updating.
1: Auto tuning the parameters for the
temperature control. After tuning is
done, the system is in auto control
mode (PID_MODE is set to 0) and fill
in the appropriate parameters
(Kc_Kp, Ti_Ki, Td_Kd, and Tf)
2: Automatic control (including
I_MV): When PID_MAN switches
from TRUE to FALSE, the MV value
is invoke the output value (MV) in the
6_
6 - 2 0 1