West Control Solutions Pro-EC44 - Manual (Page 97)

Pro-EC44 2-Loop Graphical Profile Controller & Recorder
Pro-EC44 Product Manual - 59540-1 October 2013 Page 90
Loop-back Segments
A Loop-back segment goes back to a specified segment in the current profile. This action is
repeated for the required number of times (1 to 9999) before the profile continues onwards.
More than one Loop Segment can be used in a profile, but they cannot cross.
Loop-back target segment
End
Loop Segment
Figure 50. Loop-back Segments
Profile Running / Holding vs. Hold Segments
Hold Start
Run
Continue
Triggers
End
Hold Stop Hold Segments
Figure 51. Run/Hold & Hold Segments
A Hold condition during a segment maintains the current profile setpoint value(s). Once the
hold condition is stopped the Ramp or Dwell continues. The user can request that the profile
holds, or it can be instigated automatically.
Note: A running segment will hold if the operator or a digital input instructs it to. It
can also hold due to
“auto-hold”, if one of the profile control loops is disabled, if a
cascade is set to “open” or if manual control is selected.
A Hold Segment is a pre-planned hold programmed into the profile. It maintains the value of
the previous segment and the profile does not continue until a Continue Trigger occurs.
This can be via a key-press, serial communications, a digital input signal or after waiting until
a pre-set time of day (time of day is available with the recorder option only).
x 500
Example:
Runs segments 1 to 5, then
repeats segments 3 to 5
again 500 times, before
continuing on to segments 7
to 9,