Page 413 - ExtendSim User Guide
P. 413

Merging, Diverging, and Routing Flow 387
Merging and diverging flow
☞ For the Merge block, each input connector is referred to as an inflow branch. For the Diverge block, each output connector is referred to as an outflow branch. Collectively they are known as the variable branches.
Mode table
The following table lists the Merge and Diverge modes in alphabetical order and summarizes their main similarities and differences.
Mode
See page
Sum of inputs = sum of outputs?
Fixed rule?
Bias order required?
Parameter value at each branch that will always block the flow
Compatible with Sensing mode?
Batch/Unbatch
389
No
Yes
No
None
Yes
Distributional
392
Yes
No
Yes
Blank, <=0
Maybe
Neutral
394
Yes
No
No
None
Maybe
Priority
390
Yes
No
Yes
Blank
Maybe
Proportional
390
Yes
Yes
No
Blank, <=0
Yes
Select
387
Yes
Yes
No
None
Yes
Sensing
393
Yes
No
Yes
Blank, <=0
Yes
Characteristics
Explanations for the mode characteristics are:
• Somemodesuseafixedflowruletoobtainordistributetheflow–nomatterwhathappens in the rest of the model, the fixed rule will be respected. For other modes, the flow rules express a preference and are only invoked in specific situations depending on model condi- tions.
• Competing requests for flow amongst Merge and Diverge blocks that have been set to the Distributional, Priority, and Sensing modes require the use of bias ordering. This is dis- cussed in “Biasing flow” on page 432.
• Whileotherparametervaluesmayblocktheflowincertaincircumstances(forinstance,ifa number is out of range), for some modes a Blank or zero (0) will always cause the flow to be stopped. Values that are out of range will cause an error message; a zero (0) or Blank will not generate an error message.
• As discussed in their respective sections, incompatibilities can arise if an area of the model has one or more blocks that use the Sensing mode and other blocks that use either the Distri- butional, Neutral, or Priority mode. These situations should be avoided whenever possible as they can give inaccurate results.
Select mode
When the Merge or Diverge blocks are in Select mode, only one selected branch at a time is open. A table in the block’s dialog allows you to assign a unique ID number to each inflow branch (for the Merge block) or outflow branch (for the Diverge block). The ID connector on the block’s icon is then used to select which branch to open.
Discrete Rate


































































































   411   412   413   414   415