Delta AH500 Programming Manual page 350

AH 5 00 Pr ogr am m ing Ma n ua l
Example:
1. The instruction is used to implement the advanced PID algorithm. When the instruction is
being executed by the PLC, the PID algorithm is implemented. PID stands for Proportional,
Integral, Derivative. The PID control is widely applied to mechanical equipment, pneumatic
equipment, and electronic equipment.
2. The setting of the parameters is as follows.
Device
Function
number
PID_RUN BOOL
SV REAL
PV REAL
Double
PID_MODE
/DINT
6 - 1 8 2
Ti_Ki
Td_Kd
Tf
PID_EQ
PID_DE
PID_DIR
ERR_DBW
MV_MAX
MV_MIN
MOUT
BIAS
I_MV
MV
Setting range
Enabling the PID
algorithm
Range of
single-precision
floating-point
numbers
Range of
single-precision
floating-point
numbers
word PID control mode
Integral gain (second or
：
1/seccond)
： Derivative gain (second)
Derivative action time constant
：
(second)
： Selection of a PID formula
Selection of the calculation of
：
the PID derivative error
PID forward/reverse direction
：
(PID_DIR)
Range within which the error
：
value is count as 0
(ERR_DBW)
Maximum output value
：
(MV_MAX)
Minimum output value
：
(MV_MIN)
： Manual output value (MOUT) Double word
： Feedforward output value
Accumulated integral value
：
(I_MV)
： Output value (MV)
Description
True: The PID algorithm is
implemented.
False: The output value (MV) is reset
to 0, and the PID algorithm is
not implemented.
Target value
Process value
0: Automatic control
When PID_MAN is switched from
ON to OFF, the output value (MV)
then is involved in the automatic
algorithm.
1: The parameters are tuned
automatically for the temperature
control.
When the tuning of the parameters
Double word
Double word
Double word
Bit
Bit
Bit
Double word
Double word
Double word
Double word
Double word
Double word
Device number
Range of
single-precision
floating-point
numbers
Range of
single-precision
floating-point
numbers