Ai Channels; Function Block: Pid - Emerson Bettis XTE3000 Installation, Operation And Maintenance Manual

Section 6: Function Blocks Description
January 2022
6.4.1

AI Channels

Table 10.
Name
Position - actual
Torque - actual
6.5

Function Block: PID

Figure 18
A standard PID function block is provided with full 3 terms control block.
The PID controller calculation (algorithm) involves three separate parameters; the proportional, the
integral, and derivative values. The proportional value determines the reaction to the current error,
the integral value determines the reaction based on the sum of recent errors, and the derivative value
determines the reaction based on the rate at which the error has been changing. The weighted sum
of these three actions is used to adjust the process via a control element such as the position of a
control valve or the power supply of a heating element.
By tuning the three constants in the PID controller algorithm, the controller can provide control
action designed for specific process requirements.
Detailed description of PID algorithm and setup can be found on MDE 230 "PID Function Block
Technical Description".
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Installation, Operation and Maintenance Manual
Channel
Type
Number
81 Float
82 Float
Value EU Description
0.0 ÷ 100.0 % Current actuator position
-100.0 ÷ +100.0 % Current actuator torque
Function Blocks Description
MDE 255 Rev. 0