5 Temperature Measurement Module DVP 04TC-E 2
CR#121, 141, 161, 181: Sampling time (s)
[Explanation]
1. Set up the time interval between each action of sampling. If the temperature in the control
environment does not vary significantly, set up longer sampling time; however if temperature varies
quickly, set up shorter sampling time.
2. Setup range: 1 ~ 30, Default =K2. The conversion time of each channel in the temperature
measurement module is approximately 1 second. Therefore, if the value is smaller than 1, 1 will be
automatically written into the CR. If the value is bigger than 30, 30 will be written into the CR.
3. Output cycle time (ms) is equal to the setup sampling time (s), i.e. if the sampling time is set as 2, the
output cycle will be 2,000 correspondingly.
CR#122, 142, 162, 182: K
P
value, Default =K121
[Explanation]
K
P
: The proportional control constant, i.e. proportional band. The proportional control refers to that the
output is in proportional to the error. Please refer to the PID operation formula and set up an appropriate
parameter.
Output MV (%) = E / K
P
× 100%
MV
: Output value
P
K
: Proprotional gain
tE
: Error value
Example:
Set up K
P
= 10, E = 1, K
I
= 0, K
D
= 0 (Close K
I
, K
D
)
MV (%) = 1 / 10 × 100% = 10%
The output percentage displayed in CR#131, 151, 171, 191 will be 10%.
CR#123, 143, 163, 183: K
I
value, Default = K2098
[Explanation]
K
I
: Integral constant.
1. Suppose only proportional control is applied, there will be certain deviation between the set value and
the actual temperature. If integral control is applied, the deviation will decrease gradually and the
target temperature can be achieved.
2. Integral control function will be disabled if K0 is set to the CRs.
3. If the curve is too gradual, please adjust K
I
. The closer the K
I
to 0, the more abrupt the curve becomes.
CR#124, 144, 164, 184: K
D
value, Default = K-29
[Explanation]
K
D
: Derivative constant.
1. Derivative control enhances disturbance rejection and helps the control status get back to the target
temperature quickly.
2. Derivative control function will be disabled if K0 is set to the CRs.
3. If the output percentage fluctuates too much, please adjust K
D
. The closer K
D
value to 0, the less
fluctuating the output percentage will be.
CR#125, 145, 165, 185: Upper limit of I value, Default = K0
CR#126, 146, 166, 186: Lower limit of I value, Default = K0
[Explanation]
1. When both upper limit and lower limit are 0, the upper/lower limit function for I value will be closed,
which means there will be no upper/lower limit for I value.
2. When the upper limit is set to be smaller than the lower limit, the upper and lower limit will be set to the
same value.
CR#127, 147, 167, 187: I value
[Explanation]
Current accumulated offset value.
DVP-ES2 Module Manual
-9
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