Taking Control Of A Loop; Changing Control Parameters - ABB 800xA Operation

Section 3 CCF Displays

Taking Control of a Loop

You can take control of a loop from the loop's faceplate or from the Loop FCM
display by changing a control parameter. Control parameter changes for a loop tag
that are made from these displays allow you to monitor the results of both manual
and auto control operations.
The ability of a user to control a tag is determined by the security access rights
assigned to the control action for the object. If control access is granted for a tag,
you can perform the activities described in the following paragraphs.

Changing Control Parameters

The method of changing a control parameter for a PID, Control or Device loop is
similar in all cases. They may be changed from any operational display where the
loop tag target is displayed.
Using the Faceplate
A general procedure for changing control parameters from a faceplate is provided
below.
1.
3BUR002418-600 A
Select the tag target on a graphic or the process values box on a Loop Detail
display. This displays the applicable faceplate (based on the kind of tag).
Figure 14 is an example of a faceplate for a PID loop in auto. Faceplates for
other types of loops contain information appropriate to the loop type. Measured
Value (Pv) is an indicate-only field and cannot be changed.
You may have to adjust some preliminary parameters as a prerequisite for
changing the parameter that you actually want to change. For instance, to
change the output, the computer mode must be set to local, and the output
mode must be set to manual.
Taking Control of a Loop
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