Delta AS Series - Page 229

Chapter 7 Temperature Measurement Module AS04/08TC
7- 33
7_
CR#
Operand Function Description Defaults
CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8
0%–100%, the
accumulated
integral value in
I_MV is
unchanged.
626 656 686 716 746 776 806 836 CYCLE
Sampling
time (T
S
)
When this
instruction is read,
the PID algorithm
is implemented
according to the
sampling time, and
the MV is
refreshed.
If T
S
is less than 1,
it is read as 1. If T
S
is larger than
1,000, it is read as
1,000.
Unit: 100 ms
1
Note: When using PID parameters to set up control registers: PID control registers of AS04TC-A and RTD-A
are retainable; however PID control registers of AS06RTD-A and AS08TC-A are not retainable.
PID formula:
1. When the PID_MODE is set to 0, the mode is set to auto:
 Independent Formula & Derivative of E（PID_EQ=False & PID_DE=False）
BIAS
dt
dE
Kdt
EKiE
KMV
d
t
P
++
+=
∫
*
0
(E = SV – PV or E = PV – SV)
 Independent Formula & Derivative of PV（PID_EQ=False & PID_DE=True）
BIAS
dt
dPV
KdtEKiEKMV
d
t
P
+−+=
∫
*
0
(E = SV – PV)
Or
BIAS
dt
dPV
KdtEKiEKMV
d
t
P
+++=
∫
*
0
(E =PV – SV)