ABB 800xA Operation page 44

Operator Controls
44
Table 3. Buttons and Indicators (Continued)
Icon Name
Local Bias
Remote Bias
Local Ratio
Remote Ratio
FeedBack
FeedForward
FeedForward-
FeedBack
Control Output
Tracking
Setpoint Tracking Tag is in setpoint tracking mode (LOC and
Description
Switch to Local Bias operation. Bias value can
be changed locally while in this mode.
Switch to Remote Bias operation.
Switch to Local Ratio operation. Ratio value
can be changed locally while in this mode.
Switch to Remote Ratio operation.
Feedback is used with the standard integral in
the PID algorithm to provide an anti reset
windup capability. If the feedback input is not
used, the limited output value is used.
This control loop has a feed forward input that
is added or multiplied to the denormalized
AUTO output of the PID algorithm.
Both FeedForward and FeedBack are used.
Tag is in control output tracking mode. If the
station goes into output tracking mode, the
output percentage adjusts to changes in its
reference signal. Control output changes
cannot be initiated from the workstation when
the tag is in this mode.
REM will be shaded). The set point tracks
either the process variable or a selected
variable. The set point cannot be adjusted
from the console in this mode.
Section 3 CCF Displays
3BUR002418-600 A