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FlexSim Supplemental Training: Session 3. 20121029. Modeling Concepts. Closing and Opening Output/Input Ports Sending Messages to alter object behavior. 2. Basic Object Control. closeinput ( object ) openinput ( object ) stopinput ( object ) resumeinput ( object )

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Presentation Transcript
modeling concepts
Modeling Concepts
  • Closing and Opening Output/Input Ports
  • Sending Messages to alter object behavior

2

basic object control
Basic Object Control
  • closeinput( object )openinput(object )
  • stopinput( object )resumeinput(object )
  • closeoutput(object ) openoutput(object )
  • stopoutput(object ) resumeoutput(object )
  • stopobject( object ) resumeobject( object )
  • sendmessage( toobject, fromobject, parameter1, parameter2, parameter3 )
  • senddelayedmessage( toobject, delaytime, fromobject, parameter1, parameter2, parameter3 )

3

close open commands
Close/Open Commands
  • Close
    • closeinput( object ) – Blocks input ports of object. Indicated by small, red bars drawn across all input ports.
    • closeoutput(object ) – Blocks output ports of object. Indicated by small, red bars drawn across all output ports.
  • Open
    • openinput(object ) – Unblocks input ports of object.
    • openoutput(object ) – Unblocks output ports of object.
    • It is recommended to use the open commands in the OnMessagetrigger only [using senddelayedmessage()]. It will work in other cases, but there could be issues because these commands do some work behind the scenes.

4

stop resume commands
Stop/Resume Commands
  • Stop
    • stopinput( object ) – Same as closeinput(), except it keeps track of consecutive stopinput() commands. Will only open input ports after all stops have been resumed.
    • stopoutput(object ) – Same as closeouput(), except it accumulates as well. Will only open ouput ports after all stops have been resumed.
    • stopobject( object ) – Tells object to stop functioning. Will specify a state for the object to go into while waiting for resumeobject() [helpful for statistics]. Also accumulates. Good resource on stopobject() and resumeobject() in Command list of User Manual.
  • Resume
    • resumeinput(object ) – Same as openinput(), except it accumulates. Input ports are unblocked after all stops have been resumed.
    • resumeoutput(object ) –Same as openoutput(), except it accumulates as well. Ouput ports are unblocked after all stops have been resumed.
    • resumeobject( object ) – Tells object to resume to what it was doing before stopobject() was called. Also accumulates.

5

messages
Messages
  • message– information sent from one object to another.
  • When an object receives a message, its OnMessage trigger is fired.
  • Messages can be sent immediately with the sendmessage() command, or after a specified period of time using senddelayedmessage().

6

order of execution messages
Order of Execution(Messages)

OnMessage

trigger of

receiving object

sendmessage()

OnMessage

trigger of

receiving object

delay

senddelayedmessage()

Is there a difference between a message sent immediately and delayed in zero time?

7

the onmessage trigger
The OnMessage Trigger
  • Trigger logic fires as a reaction to the sent message. Parsing the received data dictates behavior
  • Access Variables
    • current
    • msgsendingobject()
    • msgparam(1)
    • msgparam(2)
    • msgparam(3)
  • Object receiving the message
  • Object that sent the message
  • First numeric data sent
  • Second numeric data sent
  • Third numeric data sent

8

model description
Model Description
  • Purpose
    • Learn how to control product flow and send delayed messages.
  • Description
    • Assume an infinite supply of A and B components.
    • The two components must be glued together with epoxy which takes lognormal2(0,2.6,0.8) seconds.
    • The assembled parts must wait in a staging area for at least 15 seconds for the epoxy to cure before they can enter the paint booth.
    • It takes lognormal2(0,2.5,0.5) seconds to paint each part separately.
    • After each part is painted and exits the paint booth, the booth must be purged for 3 seconds before another part can enter.
  • Questions & Bonus
    • What is the average and maximum time a part waits in queue?
    • How does throughput change if 10 parts can be curing simultaneously?

9