8/28/2019 12:56 PM | |
Joined: 4/28/2015 Last visit: 9/9/2024 Posts: 3345 Rating: (379)
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Hi, I am not that experienced with the I2C bus, but I assume that every sensor which is connected to the I2C bus must have its own address. For connection between IOT and PLC you can use the existing ethernet port(s) and do not need any other hardware. The communcation can be done with S7 communcation. Here we have a node-red example. Best regards! |
Not working for IOT2050 support anymore from March 1st, 2024. |
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This contribution was helpful to1 thankful Users |
8/28/2019 10:35 PM | |
Posts: 20 Rating: (0) |
Thank you very much for your replies! bergmanu, I understand what you're saying. However, I was planning on having all sensors sharing the same I2C bus and connecting this I2C bus (SDA and SCL wires) respectively to the SDA and SCL pins on IoT2000. I probably need a module to connect all sensors to the same I2C bus (probably a multiplexer, but please correct me if I'm wrong). The expansion board mentioned on that example has just one pin per led. If I try to make an analogy between those LEDs and the distance sensors, I can't because the sensors have I2C interfaces (2 wires, SDA and SCL, per sensor). Am I missing something here? Is there a way to use the same expansion board? Should I replace that expansion board by a multiplexer (for example, this one http://www.ti.com/lit/ds/symlink/tca9548a.pdf)? iiot2k, thank you very much for your reply! Could you please explain to me the difference between Grove I2C hub and an I2C multiplexer? Are both alternatives to soldering? |
Last edited by: maria.noronha.costa at: 08/29/2019 06:55:56 |
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8/29/2019 12:55 PM | |
Posts: 20 Rating: (0) |
Thank you very much for your reply! I'm planning on using these distance sensors (https://www.st.com/en/imaging-and-photonics-solutions/vl53l1x.html) and an S7-1200 CPU 1215C PLC. The project also requires a large number of sensors, probably up to 30. If all sensors have different addresses, then I just need a grove USB hub to connect them in parallel? And, if I have multiple sensors with the same address, then I need a switch chip (for example,http://www.ti.com/lit/ds/symlink/pca9543a.pdf)? |
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