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PID Control Loops
Note: Even if Mode is set to Manual, the PID control function is monitoring input values and
performing other functions that require processor resources. To configure the unit so that no
processor resources are consumed by the PID control function, disable the Scanning parameter.
8. Enter a value for
elapse between the beginning of one execution of the PID algorithm and the beginning of the
next execution. If an override loop is implemented, the PID algorithm will be executed for
both loops within the specified time period.
9. Define the
a. Using the
point from which it will be read (e.g., an analog input or pulse input).
b. Enter the
value in the EU used by the point assigned in the previous step.
10. If
Output Type
a. Using the
PID control. The primary loop and the override loop use the same analog output.
b. If desired, enter an initial value for the analog output. This value is applied only in manual
mode, and is used to avoid bumps in the analog output level at system startup.
c. Ensure that the analog output is configured correctly. See Section 7.5.
If
Output Type
a. Using the
open/forward control.
b. Using the
close/reverse control.
c. Ensure that the discrete outputs are configured correctly. See Section 7.7.
11. If an override loop is implemented, click the
window is expanded to include additional parameters and controls as shown in Figure 10-2.
Set
Override Type Select
•
If set to
adjustment.
•
If set to
adjustment.
104
. This parameter defines the minimum time period that must
Loop Period
loop, and the
Primary
dialog box, assign a process variable to the loop by specifying the
Select TLP
value to be used as a target for the loop process variable. Enter the
Setpoint
is set to
, define the
Analog
dialog box, specify the analog output that will be used to implement
Select TLP
is set to
Discrete
dialog box, specify the discrete output that will be used for
Select TLP
dialog box, specify the discrete output that will be used for
Select TLP
as required:
, the output is controlled by the PID control loop that requests the greater
High
, the output is controlled by the PID control loop that requests the lesser
Low
loop if required.
Override
Output Point
, define the
DO Open Point
button in the
Tuning
Micro Motion
:
and the
DO Close Point
window. The
PID Loop
®
Model 3711 Gas Flow Computers
:
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Table of Contents
Troubleshooting
