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Showing results for 'source objects disappear'.
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At some point I would start looking for a SCADA system, write it in Python or anything outside Simio. A Simio Engineer would be better suited to help you, but I still believe you could build this inside Simio (maybe through an API?). I manage to build a very ugly version of this that kinda works. It's not real real-time, because I still need to click on the manual import button (I don't know how to help you with this). I set my source's Arrival Mode to On Event; Create a process with a Decide step that checks if the table received a new value: If it received a new value, trigger SourceEvent; If it didn't, check again a second later. As I said, it's not very elegant, but I hope it inspires you to find the right solution.
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Can you limit the amount of entities in the simulation?
GFurtado replied to jush198's topic in SI General Discussions
Alternatively, you could limit the number of entities created by the source. Check Maximum Arrivals property under your source's Stopping Conditions. -
If you right-click on the Standard Library you'll see a Show Deprecated Objects option. The Workstation should appear in your library after that, but you could try to solve this using servers instead as a bonus challenge.
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Hello, I have a network with one source and different sinks. I use add on process on the output of my source to choose the sinks based in the capacity. When I run the model, all created entities destroyed in the sinks correctly but in result part, "TimeInSystem" is equal zero. Due to add on process, is it happen?Should I calculate time in system with Tally? Best, Nadere
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In fact everthing is ok except you did not placed the subclassed sink objects (mysink type objects) into the facility layout. Probably you forgot to drag them from the project library (at the left bottom window) to the facility layout. I attached the fixed version of the same file. Do not hesitate for asking more. cutoff.spfx
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In the attached model, entities are dispatched according to some "Mysink" objects' inputbuffer entered cutoff values (predetermined values). I intentionally put these cutoff values values in the table to show how you can use state variables inside a table. Also, I intentionally place some steps seperately to increase understandability of the model. Due to having limited time I did not test the model. You can fine tune the model and develop it in a more compact manner. Time In System considering cutoff values.spfx
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First, you should define a "NodeReferenceState" on ModelEntity. After finding the appropriate sink to send use "set node" step to assign the found sink's input node as the destination node of the entity (ModelEntity.NodeReferenceState=input@sinkx). Then, do not use transfer step. Instead, set the entity destination type property of source object as specific and also set node name property as ModelEntity.NodeReferenceState. By this way each entity will find its own way via the links you defined.
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Hello, I have a network that it has several sources and sinks. I set the following properties for each path: 1) Initial Traveler Capacity: 770000 2) Drown to scale: False 3) Logical Length: 150 Miles 4) Allow Passing: False 5) Speed Limit: 90 Miles per Hour. By putting these properties on the link, congestion is occurred in the system. When I run the model that entities randomly choose path and sink, TimeInSystem get different values for minimum, maximum and average in result part. However, when I put sequence for all paths and source, TimeInSystem get the same values for minimum, maximum and average in result part while we have congestion in the network. Can you tell me why the TimeInSystem does not change? Thanks, Nadere
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I am using transfer step for the entities to the sink but there are different links and path between the source and sink. So, if I use transfer step in add on process, the entity transfer from source to sink directly. Then, the time in system cannot be computed. I want to determine the destination (sink) by using add on process after checking some criteria. Could you please help me about this problem? My goal is to choose the sink after checking some criteria and then send entities from source to that destination(sink) by using some path randomly. Thanks, Nadere
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Dear all, I am currently working on my master's thesis. The goal is to simulate the waiting line in front of a chair lift at a ski resort. I may have future questions, so I hope we can keep this topic open for other questions on the same model. I started adding objects and need to set the properties for the servers now. Currently I am struggling to find the correct setting that allows me to process entities at a fixed time interval. I want the red barriers in front of the moving walkway to open every 7.2 seconds (interval between two chairs). The servers are called "Schranke" in my screenshot. Moreover, every barrier should open at the same time, i.e. all six servers are supposed to process one entity at the same point of time regardless of its arrival. Thanks for your help! Nico
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Hi, I have a global model state that reacts on that same timer and increments the current timeslot, that should work too, I assume? I feel that I've modelled the timeslots accurately. However, I've now run into my next hurdle: in order for the entities to make an intelligent choice on what time slots to request, first, I must be able to know what servers to visit at all. Currently, this is defined by a set of sequence tables. I have not found a way to store the sequence of destination nodes (or objects) in a (set of) states. Does anyone know how to access the sequence up front, in states or properties or lists? I'd like to store the sequence 'on' the entity, and not in the upper level model, where it has been defined. Kind regards, Tom -
I would like to reference state values associated with objects within a data table. For example, suppose I have a Data Table, call it Tab1, with an Object Reference column called Obj. The first entry in the object reference column is a resource called Res; thus, Tab1[1].Obj points to Res. How do I access the value of Res.CurrentCapacity using the table reference? To make this a little more complex, what if the state were a vector of integers? Thus, what I would like to reference would be something like Res.vector1[1].
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I am trying to simulate a model of a factory where 6 hours of planned maintenance occurs every Wednesday at the same time, from 8am to 2pm on the production line. There is a second almost duplicate line which can then be operated when the maintenance begins, it is attached to the 1st line after the source and the first server. The factory is 24/7 in production. When this occurs the 1st line should clear of all entities and should remain empty for the 6 hours. How is it possible to simulate this 6 hours of no production on the first line after the first server and when this happens the source should continue producing but follow another path to a second line after the first server. From this experiment i want to see how many entities can still be created over a period of time when the maintenance occurs by using the second line. -
Searching for alternate function to RandomRow
FOUADELALBI replied to FOUADELALBI's topic in SI General Discussions
Thanks Gochen for your reply. I really appreciate it. I just rechecked your model but still giving me 10 jobs some of them are duplicated which does not represent 10 different entities (jobs). Anyway, I am going to keep looking for an elegant way to do it based on your hits. Now, let me explain the next step; since the source problem is solved (at least temporary), now I am going to tackle the server and resource objects. I have 10 different jobs waiting to be processed in front of the first sever in the shop. The server cannot process them without resource such as tool, worker, etc...Each job has a processing time on the server but also depending on the resource. I have attached a doc snapshot if you are not able to open an academic license. The goal is: the server has to seize the available resource that has the smallest processing time in order to process the job. I found a nice file in the Simbits which is: SeizingSameResourceFromList. It does part of the job but still to be improved. The same allocated resource sticks to the job all the way. In my case, I want the server to choose from the available resource each time the resource is needed. I hope my explanation was clear enough. Thank you. Model Overview.docx -
Searching for alternate function to RandomRow
gocken replied to FOUADELALBI's topic in SI General Discussions
In the model I attached if you set "Maximum Arrivals" property of source object to 1 and "Interarrival Time" property of source object to "0" you can get the same logic. It is unnecessary to include ten source objects in the model. I did not understand what u wnat to do? resource objects has no processing time properties? What do you mean with resource? resource object? Could u state your problem clearly pls? -
Hi SI Forum, I am a student using the student version and ran into a problem of the size of my model. I had too many objects in my model environment and needed to split my control model apart from my future conditions model. This might not have been the best approach, but it was the best way I could think to solve the issue at the time. In the model, I did use different random number streams for each random variable. My question is: how can I compare a future conditions model to a control model if they were run in separate project files? Is this possible? When looking through the outputs, all response variables are correlated in the future conditions model, but not to the control model. I've already requested a large model upgrade to help with this issue in future runs of this model. However, I'm trying to understand what's causing the difference between the models. If both models are using common random number streams for the random inputs, why wouldn't the control model response variables be correlated to the future conditions model outputs? Maybe there is a way to link the two models. Is it possible to have two models in the same project file by linking them somehow? Additionally, if you have other ideas on best practices for reducing redundancy in modeling practice, it would be great to learn from your experiences! Thanks!
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Hello All, I am new to Simio and trying out a simulation of an aircraft component assembly shop. I am using Sequence table for my jobs routing and processing scenarios which is - Source -> Set A (4 servers) -> Set B (7 servers) -> Set C (5 servers) -> Set D (2 servers) -> Sink Here each Set denotes similar workbenches to any of which a job can be routed based on utilization and availability at that point of time. So for routing job based on above criteria from Source, I created sequence table with 'Node list property' (which is list of input nodes on 4 servers of Set A) instead of 'SequenceDestination Property' as required by Sequence table. I want to replicate the sequencing from Source -> Set A -> Set B and so on. But want simio to pick the server of these sets based on my criterion. Unfortunately it is not working as I assume Sequence table need to have specific node as SequenceDestination. I am not sure if I am doing it right or what is correct and way to do it. I will highly appreciate any suggestions to make this happen in Simio. Thank you. -Mohmed -
Hello, I want to model an evacuation network design problem with Simio. My goal is to consider traffic congestion in the model. Congestion happens when road capacity is not enough for that amount of people immediately leave the source node. I was wondering if you could let me know how to consider capacity for either path or connector. I would be happy if you could share an example with me. Thanks, Nadere
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Hi, In the modell I'm working on I have a set of sources that generate different types of entities and two workers that have to grab those entities and trasport then to another node. The decision of which source is unloaded first is defined by a specific probability distribution. However, I don´t know where to define this decision to route the worker. Could someone please help?
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Entities only to be created on week days
devdatta replied to CGGericke's topic in SI General Discussions
Hi, I have attached a small example model to show a way to stop creating entities over weekend. I have Sub classed the source object and overridden the 'OnStopEventOccured' process. Within the process, i have added a 'Wait' step to disable entity creation over weekend and an 'Assign' step to enable the process again. Place the sub classed source object within the model and add two events, 'StopEvent' and 'ResetEvent' to the model. 'StopEntityCreationOnWeekend' process within the model checks which day of the week it is and accordingly fires an event which either stops creating new objects from the sub classed source object or starts creating new objects. Change the sub classed source objects 'Stop Event Name' property to 'StopEvent' which will disable the source object if it is a weekend. Similarly,change the event name for the wait step in the sub classed source object to 'ResetEvent' which will enable the source object again. ThanksStopEntityCreationOnWeekend.spfx -
Hi, I want to have a source that creates entities according to a date. But also, I want each entity to carry some information like Code, Processing Time and Type. It is possible to do that? And After, how I can use the information that each entity carry? For example, Each entity has their own processing time (according to the table), how I can use that procesing time in a server? Thanks for your help!!! -
Define incoming patients' admission to hospital dates as a "DateTime" Property in your table. And set "Arrival Mode" of Source object as "Arrival Table". Then, set arrival Time Property as "DateTime" property you defined. This will provide creating entities according to their admission to hospital times.
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Hello, I am working on evacuation network design problem. My network has several evacuation areas (source nodes), road segment, and shelters (destination nodes). I consider congestion as people might stick in the traffic and they have to reduce their speed in the road. My goal is to send people from hazard areas to safe areas in the defined time horizon. So my first question is that, can I use SIMIO for simulating my model? Since my model has limited time for evacuation (Terminating problem), can I validate my problem with replications, if yes, how many replications I need? 2) Is there any other method to validate my model? Thanks,
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In my model, entities are created representing each row in a data table at the source. At creating, the entities are assign to a row in the data table. The entities are created and assigned the right data until the last row of the table is created and then I get this message "Error setting table reference" and the simulation stops. How do I set the model to stop creating entities when the last row is created? Thanks in advance! SampleModel2.spfx
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Hi Fra, Have you tried changing the Input Buffer Capacity and Output Buffer Capacity to '0'? This will prevent the pieces from queuing in front of the servers because there is no input buffer for them to queue in. Instead, they will queue on the link leading up to the server. If you use a Path, to see pieces queue up behind one another, set the Allow Passing to 'False'. If you want the pieces wait at the current object until the downstream object is available, you can use a Connector (instantaneous travel). For a solution where travel time is required between objects, you can explore using Add-On Process Logic to prevent moving until the downstream object is available. In this instance you would use either a TimePath or Path. All the best, Caleb
