Loop Detail Displays; Control And Pid Loops - ABB 800xA Operation

Loop Detail Displays

Loop Detail Displays
The Loop Detail Display provides the means to manipulate tunable parameters. The
information available on this display varies according to the loop type: Control,
Continuous, PID, and Device.
Generally, users with Operator authority have read-only access to the Loop Detail
Display. Control/tuning functions are restricted to System Engineers. The
authority assignment for functions associated with this display can be changed as
described in the Objects and Access Rights section of System 800xA
Configuration (3BDS011222*).

Control and PID Loops

The Loop Detail Display for a PID loop,
setpoint value, and output value trends for a loop. A reduced or standard size
faceplate is used to modify the setpoint and output values. The trend graph shows up
to 600 points (traces start when the window is displayed). The data is based on CCF
trend data.
The trend Refresh rate on the Loop Detail page, allows you to change the rate at
which a trend graph is updated. Select Refresh to get the Change Refresh Rate
dialog where you can change this rate to any integer number from 1 to 120 seconds,
the default value is 1. After changing the Refresh value, the plot restarts and the
trend is refreshed at the new rate.
The Loop Detail Display also provides the means to set the following loop
parameters:
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Loop setup values, including Phase, Scan Rate, Loop Mode, and Trend Rate.
Tuning parameters, including Gain, Reset, and Preact.
Alarm configuration conditions:
– Alarm Post.
– Alarm Check.
– Engineering Deadband.
– Output Deadband.
– Deviation Deadband.
Section 3 CCF Displays
Figure 2, shows the measured value,
3BUR002418-600 A