Output Splitter Block; Execution; Figure 24: Output Splitter Block; Figure 25: Output Splitter Schematic - Honeywell SLG 700 Option Manual

3.15 Output Splitter block

The output splitter block drives two control output signals from a single input signal. Each output is a
linear function of a fraction of the input signal. The same linear function when used in reverse
provides the back calculation support. For different combinations of input and output conditions, a
decision table supports cascade initialization. This block finds application in split ranging or
sequencing of multiple valve. In a typical split range application, when the splitter input is 50% both
the output valves remain closed. One of the valves opens proportionately to full as the input drops to
0% and the other valve opens proportionately as the input rises above 50%. In a typical sequencing
application, both the valves are closed at 0% input. One of the valves opens proportionately to full as
the input rises to 50%, while the other stays shut. The second valve opens as the input rises above
50%, and the first valve may remain open or shut off quickly. As this block is in the control path, it has
the ability to pass limit and cascade initialization information back to the upstream block.

Figure 24: Output Splitter Block

Execution

Figure 25: Output Splitter Schematic

The relationship of each output to the input may be defined by a line. Each line may be defined by its
endpoints. Examples of graphical representations of OUT_1 and OUT_2 vs. SP are shown below for a
split range and a sequencing application.
Rev.5 FOUNDATION Fieldbus Option User's Manual Page 109