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Chapter 4 Explanation of Functions
(2) PID operation
1) P operation
The proportional (P) operation stands for the operation in which the change in operation quantity is in
proportion to the change in target value.
A
072
A
072
Change in steps
Linear change
Large
Small
Large
Small
Target value
Operation quantity
2) I operation
The integral (I) operation stands for the operation in which the operation quantity increases linearly over
time.
A
073
A
073
Small
Large
Small
Large
Target value
Operation quantity
3) D operation
The derivative (D) operation stands for the operation in which the operation quantity changes in
proportion to the rate of change in the target value.
A
074
A
074
y
Large
Small
Large
Small
Target value
Operation quantit
The PI operation is a combination of the P operation 1) and I operation 2). The PD operation is a
combination of the P operation 1) and D operation 3). The PDI operation is a combination of the P
operation 1), I operation 2), and D operation 3).
(3) PV source setting
Select the terminal to be used for the feedback signal with the PV source setting function (A076).
The terminal to input the target value follows the frequency source setting (A001). The terminal selected by
the PV source setting (A076) is excluded.
If the control circuit terminal block ("01") has been specified for frequency source setting "A001", the
setting of AT selection (A005) is invalid.
The table below shows how the PID target value is selected according to the setting of "A006" when the
analog input is selected by the PV source setting and the control circuit terminal block ("01") is specified for
"A001".
PID target value
PV source setting (A076)
A006=00 A006=01 A006=02 A006=03
00 (OI-L)
O + O2
(non-reversible)
O + O2
(reversible)
O
01 (O-L)
OI + O2
(non-reversible)
OI + O2
(reversible)
OI
Operation targets include the
input to the OI terminal.
O + O2
(non-reversible)
O + O2
(reversible)
O
Operation targets include the
input to the O terminal.
OI + o2
(non-reversible)
OI + O2
(reversible)
OI
10 (operation
result)
Operation targets are the inputs
to the OI and O terminals.
O2
(reversible)
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