Bfm#60][Bfm#100][Bfm#140][Bfm#180] Integral Time (I); Bfm#61][Bfm#101][Bfm#141][Bfm#181] Derivative Time (D) - Mitsubishi Electric MELSEC FX Series User Manual

Programmable controllers
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FX
-4LC User's Manual
3U

8.2.24 [BFM#60][BFM#100][BFM#140][BFM#180] Integral time (I)

To these buffer memories, set the integral time (I) for performing PID control.
The integral operation changes the control output in proportion to the area made by the deviation size and
deviation generation time.
In proportional operation, deviation (difference between the set value (SV) and the measured value (PV)) may
be generated due to natural radiation even if the control output is stable.
Integral operation eliminates this deviation. The integral time refers to the time in which the control output
given by the proportional operation is obtained only by the integral operation.
As the integral time is decreased, the integral efficiency is better.
BFM No.
CH1 CH2 CH3 CH4
#60
#100 #140 #180 Setting range : 0 to 3600 (sec.)
Caution
When "0" is entered, the integral time (I) setting is invalid.

8.2.25 [BFM#61][BFM#101][BFM#141][BFM#181] Derivative time (D)

To these buffer memories, set the derivative time (D) for performing PID control.
Derivative operation changes the control output in proportion to the change in speed of the measured value
(PV) to prevent an increase in the deviation (difference between the set value (SV) and the measured value
(PV)).
Because derivative operation responds to the rate at which the measured value (PV) changes, the response
to disturbances (noise in measured value caused by external factors) is improved. The derivative time refers
to the time in which the control output given by proportional operation is obtained only by derivative operation
while the deviation increases and decreases at a constant ratio.
As the derivative time increases, the derivative effect increases.
BFM No.
CH1 CH2 CH3 CH4
#61
#101 #141 #181 Setting range : 0 to 3600 (sec.)
Caution
When "0" is entered, the derivative time (D) setting is invalid.
90
Description
Description
8 Buffer Memory
8.2 Buffer Memory Details
Initial
R/W
Backup
value
240
R/W
Initial
R/W
Backup
value
60
R/W

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