In the Scheduling on Unrelated Parallel Machines problem, the goal is to find an jobs/machines assignment to minimize the overall makespan. In other words, the goal is to have the best balance between machines.
The automatic identification system (AIS) is an automatic tracking system that uses transponders on ships and is used by vessel traffic services (VTS). AIS information supplements marine radar, which continues to be the primary method of collision avoidance for water transport. Continue reading AIS receiver on a Raspberry Pi with RTL-SDR
This is is a short demonstration of a co-simulation between Siemens PLCSIM Advanced and C#. The goal is simple : have the ability to conditionally change inputs. We’ll do a proof of concept with a small exemple for a safety relay monitored by a feedback.
We’ll run the simulator and the editor on two computers :
2 Simulator configuration
First let’s start an instance with the following parameters :
Once started, it should be like that :
3 PLC Programming
3.1 Hardware configuration
Let’s do a simple configuration as follow :
Network configuration : – PLC_1 : 192.168.1.1/24 – IO device_1 : 192.168.1.2/24Note : On the simulator, we have different IP addresses for all the network interfaces : Ethernet adapter, PLCSIM virtual ethernet adapter, PLC and I/Os !
With the following I/Os :
Note that you’ll need to activate this option in the project settings :
Our program will be very simple !
OB1 will toggle a bit every second :
And FB1 will do a safety check between the relay output and the input feedback :
3.3 Compiling and loading
You should be able to compile and load :
As soon as you’ll run the program, you should have an error on the feedback monitoring :
5 C# Co-simulation
To solve this issue, we’ll running co-simulation with C#. The script will check the output value (%Q9.0) and set the feedback (%I0.0) accordingly. We’ll be using sharpdevelop as IDE.
5.1 Import DLL
Importing the DLL is easy :
Then we write a short program :
* Created by SharpDevelop.
public static void Main(string args)
//Use it for local instance
//IInstance myInstance = SimulationRuntimeManager.CreateInterface("Golf8");
//Use it for remote instance
IRemoteRuntimeManager myRemoteInstance = SimulationRuntimeManager.RemoteConnect("192.168.1.101:50000");
IInstance myInstance = myRemoteInstance.CreateInterface("1515F");
//Update tag list from API
//Start a thread to synchronize feedbacks inputs
Thread tFeedbacks = new Thread(()=>synchroFeedbacks(myInstance));
//Allow the user to quit simulation
Console.WriteLine("Press any key to quit . . . ");