How to use the value returned by Emulation to control the object sent by the Source
How to set Modbus Control Register?
provide examples.
Emulation to control object
FlexSim 20.2.3
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To control what type of object the source creates, you can set its 'itemclass' variable.
object.setVariable('itemclass', rank)
The second parameter 'rank' is the flow items rank/index in the Flow Item Bin.
The attached model was a test. We set the modbus connection up so we could remote control the conveyor speed from a Raspberry Pi.
1.Does it means I send data by my computer IP? Can I send data by other port of mobus?
2.How do I set in variables if I want to use photoeye?
1. Data is exchanged through a network connection. FlexSim can either function as the server (slave), which is what we did in our test. So the IP address is that of the computer running FlexSim in the local network. If FlexSim is running as client, it would be the address of the server.
Yes, you can change which port is used. 502 is used as standard in any source we found, so we used that one.
2. You'd add a new Sensor Register (Sensor - FlexSim writes values on event, Control - FlexSim reacts to change in value) and choose the photo eye as the Associated Object. Under 'Write Events' you can then specific which event will trigger a write operation and what value should written to the register.
It's in the nature of the task: You can't verify if the connection works without setting one up. The model should serve as an example of how to set up a connection in FlexSim and connect registers to values in the model.
We used pymodbus (modbus implementation for python) to write to and read from the registers FlexSim provides when running as server. This article helped with the basics (mainly section: pymodbus as Modbus client)
https://blog.jonasneubert.com/2019/11/02/using-pymodbus-to-communicate-with-a-plc/
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