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Showing results for tags 'j1939 configuration'.
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Hello all, I have been doing a project for a bit now, trying to get data from a NOx sensor. Nonetheless, I have tried to initialize the CANbus (SAEJ1939 Protocol) connection, but when I check the voltage for the CAN pins, there is no voltage. It should have 24 Volts so the sensor initializes. I have also connected the sensor and it does not start heating up whatsoever. I have tried other example programs for CANbus that do not use SAEJ1939 with no avail. If anyone could tell me what I am doing wrong I would really appreciate it. I have attached my program and the mentioned pins that have no voltage. Also what does PE (see picture) mean? Thank you!
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Hello! If anyone has any experience or any examples of using the SAEJ1939 Protocol, I would really appreciate some help. I am using a NOx sensor and would like to extract its data to an HMI. I am currently trying to figure out how to utilize the parameters of the J1939 Protocol. I have the values of the Protocol from the user manual but I do not know how to interpret it for the Visilogic Function blocks. For example, to extract the NOx value would I say there are 2 bytes of max data allowed? (Since there a low and high bytes). And for data pointers, does it "point" to the address of a byte or a bit? Also, once the data is received, where would it be stored? And how can I convert it to a readable value? Would I have to convert it from a BIT to a NUM eight times (Since I get a bit of information and not a byte)? I would really appreciate any thought or comments. I have attached the manual, some screenshots, and my program so far. Thanks again. trial j1939.vlp Conti UniNOx12V_spec_11 03 08 (1).pdf
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Data Pointer
alemberskiy posted a topic in Vision & Samba PLC + HMI Controllers & VisiLogic Software
I'm new to PLC, please excuse my amateur question: In J1939 Configuration Parameters, "Transmit PGN" tab, first parameter is 'Data Pointer'. Description is as follows: "This is the start of the vector that contains the data that will be transmitted from the PLC." How exactly does this work? How do i change the data i transmit? Thank you.
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