User Manual

Chapter 7 Explanation of Functions
7 - 35
(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.
2) I operation
The integral (I) operation stands for the operation in which the operation quantity increases linearly over
time.
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.
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)PID scale
About (A075) is as the following equation.
（The converted value）＝（Value before conversion）×（A075）
d004 F001 A011 A012 A020 A220 A021 A022
A023 A024 A025 A026 A027
(4) PV source setting
Select the PV sorce to be used for the feedback signal with the PV source setting function (A076).
The targeted value is set by A001.
When you specify the 02 (Modbus communication) for the PV source setting (A076), transfer data as
described below.
Write the setting data (on the assumption that "10000" indicates 100%) to register address 0006h.
Register
No.
Function name Function code
Readable/writable
(R/W)
Monitored data or setting
Data
resolution
0006h PID feedback － R/W 0 to 10000 0.01 [%]
Note: This register is readable and writable. However, this register can be read only when Modbus
RTU has been specified as the communication mode for PID feedback. It cannot be read with
other settings.
A
072
A
072
Change in steps
Target value
Operation quantity
Linear change
Large
Small
Large
Small
A
073
A
073
Target value
Operation quantity
Small
Large
Small
Large
A
074
A
074
Target value
Operation quantity
Large
Small
Large
Small