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hamit1453

c++ and plc

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hi guys i made a program with C++. i use camera for finding centre of object. it works well. It finds centres like 70 milimeters. now i want to send it to plc and not just once. this centre should go to plc always or when the camera see the object. i have no idea about that. i use visual studio and my plc is LS. please help me this photo is my program result.

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Hello, That depends on what you want to send to the PLC. A Boolean that indicates the object is +- millimeters from center, the value of the millimeters from center, a part is detected, etc.. Edited by Mark-

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I will send the object centre's coordinates. for example X=70, Y=150. i want to send that x to plc.. so i can take this object with a robot arm. my plc needs to know where this object now. regards thank you

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Hello, OK, so the next question is do you want to use a communication protocol to the PLC or analog inputs on the PLC? For example, your program could be a MODBUS master and send the data to the PLC that is a MODBUS slave. Or you could use two analog inputs on the PLC; use a device attached to your PC and output the X/Y as analog outputs.

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hello, Actually i dont have any idea about those options but a friend said me that search modbus but i dont know how i can use it. regards thank you

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Hello, MODBUS is a communications protocol, actually there are several flavors. Search the web and you will find thousands of links. It is easy to implement and you will find source code.

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thanks for helping I will search it..if u send me an example about it .. it will be great :D regards

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Hi, It seems LS PLC ( diiferent types) has only Serial ports (RS-232 or RS-485). For this reason, you need to consider the serial communication. If you are going to Modbus, then Modbus RTU can be used with your PLC. However you may need a USB converter to connect it to your PC/Laptop. for this reason you may use RS-485 to USB converter like I-7561 http://www.icpdas-usa.com/i_7561u.html?r=mohsen If you are going to use Modbus TCP which is Modbus over Ethernet, you probaly will need MTCP to Serial converter as well. If so, you can use I-7188E3 http://www.icpdas-usa.com/i_7188e3_232.html?r=mohsen Good Luck

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