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Examples of Applied Control Types
Section
5-2
170
Block address ITEM No.
Data
Explanation
002
586
AI 4-point Terminal block
901
021
Y1 (analog input 1)
002
587
AO 4-point Terminal block
021
001087
X1 (analog output 1) source designation
902
031
X1 (analog output 1)
002
012
Advanced PID block
006
901021
PV source designation
082
MV hold switch
001
087
MV
002
206
ON/OFF Timer block
100
013
Contact output
002
201
Contact Distributor block
007
100013
Source designation (ITEM013 of ON/OFF
timer is entered.)
101
008
001082
Destination designation (output to
ITEM082 of Advanced PID)
5-2-4
Dead Time Compensation
In processes having a large dead time that does not change much, the
control target is regarded and controlled as a process not having a dead time
by canceling the dead time element equivalent to the process on the PC.
Dead time compensation cannot adapt to disturbances such as load
fluctuations.
Function block used: Dead Time Compensation (Block Model 149)
Example
Dead Time
Compensation
Block Model 149
Advanced PID
Block Model 012
MV
PV
PV compensation
input (additive type)
Dead time compensation is performed on the MV output from the Advanced
PID block, and the result is connected to the PV compensation input of the
Advanced PID block. The PV compensation mode is set to "add".
Note 1
Before dead time compensation is performed, the dead time, time constant
and gain of the target process must be investigated.