Slovak University of Technology
Faculty of Material Science and Technology in Trnava
Modeling and
simulation of systems
Input and output rules in Witness
Elementary rules

Pull – input rule
 Components
are take from elements which are
arranged into list
 Pull from element1, element2, element3,...

Push – output rule
 Components
are sent into element of list which is
able to accept them
 Push to element1, element2, element3,...
 Push to Ship
 Push to Scrap
Usage of input-output rules for element
machine
Input
rule
Output
rule
Elementary rules

Wait
 Components
will be waiting until they will not
be entered or pushed out of other element

Buffer (capacity)
 The
buffer with defined capacity is added to
input or output workplace (machine)
 Buffer(20)
Least

Least parts
 Components/Parts
enter or get out from element
with the least number of parts/components
 Least parts element1, element2, element3,...

Least free
 Parts
enter or get out from element the least free
capacity of parts
 Least free element1, element2, element3,...
Most

Most parts
 Parts
enter or get out from Element with
the most number of parts
 Most parts element1, element2,
element3,...

Most free
 Parts
enter or get out from element with
the most free capacity of parts
 Most free element1, element2, element3,...
Percent
Parts enter into or get out from elements
on the basis of given percentage
probability
 Percent/flow element1 percent1, element2
percent2,...
 Percent/145 buffer1 40, rbuffer2 60

Sequence

Sequence/wait
 Parts
enter or get out from several elements
(repeatedly). It waits until the condition is
fulfilled
 Sequence/wait element1#(quantity),
element2#(quantity),...
 Typical usage - assembly
Sequence

Sequence/next
 Parts
get out from or enter into several
elements (repeatedly), but when the condition
is not fulfilled the next step follows
 Sequence/next element1#(quantity),
element2#(quantity),...
 Typical usage – batch production
Sequence

Sequence/reset
 Parts
get out from or enter into several
elements (repeatedly). We wait until all the
conditions are fulfilled at the same time. If one
condition is not fulfilled start is from the
beginning
 Sequence/reset element1#(quantity),
element2#(quantity),...
Match / input rule

Match/any
 Chosen
are random parts from the list of
elements
 Match/any element1#(quantity), {and/or}
element2#(quantity),....
Match – input rule

Match/attribute
 Chosen
are those parts which match with
specified attribute
 Match/attribute name of attribute
element1#(quantity), {and/or}
element2#(quantity),....
Match – input rule

Match/condition
 Parts
are chosen from the element where a
condition is fulfilled. Generally an element is
used.
 Match/condition X>3 element1#(quantity),
{and/or} element2#(quantity),....
Using Match rule with labor

Match/qualifier element1 with the name of
worker using path #(quantity),...
Select

Parts enter into or get out from the
element in the list which serial number
gains integer variable
 Select
on variable element1, element2,...
If clause
All input and output rules can be
conditioned by usage of If clause
 If condition

Rule
Else
Condition
endif
If clause
If condition1
Rule
Else if condition2
Rule
Else
Rule
endif
Witness

Producer
 Lanner

Group Inc. – Great Britain
Dealer
 Humusoft

s.ro. – Prague, Czech Republic
Main usage
 Witness
is set for simulation of production, service
and logical processes.
 It is used for the support of decision of leading
workers at solving of organizational, technical and
corded problems mainly connected with
restructuring and refining of company processes.
Plug-in modules Witness

Optimizer
 Optimize
module proposed with the goal to
minimize time and effort spent on
experimentation with the model. It is possible
to find optimal parameters of watched system
by usage of modern optimizing methods in the
surrounding suitable for the user very quickly.
Plug-in modules Witness

Miner
 The
module for “Data Mining“ analysis . It is
possible to identify the relations in extensive
data complex by usage of unique algorithms.
Then it is possible to use the gained rules for
judging of systems´ behaviour. They are also
available as foundation for arbitration process.
Plug-in modules Witness

Virtual reality
 Excellent
3D graphics allows work with the
real values of elements of watched systems.
This module is important when it goes for 3D
orientation or subjective 3D projection.
Possibility of work with 3D elements created
in various CAD a VR applications.
Plug-in modules Witness

Documentor
 Module
determined for creation of well
arranged documentation of simulation model.

Witness Visio
 Allows
to work with simulation models by
usage of all means which WITNESS provides
in the surrounding of VISIO program.