8/26/2019 9:53 PM | |
Posts: 20 Rating: (0) |
Thank you very much for your replies! Unfortunately, I have zero experience with IoT2000. I read some documentation and some questions posted on the forum, but I'm still unsure regarding the connection. Using the IoT, would I still need the microcontroller? For what I have read, IoT has an I2C interface, so I assume I can directly connect the I2C bus (with the data from sensors) to the SCL and SDA pins of IoT? And then establish the communication between the IoT and the PLC via some interface? Would I still need a communication module/ board? And what types of interfaces can I use to communicate between IoT and PLC? Thank you in advance! ------------------------------------------------------------------------------------------ |
Last edited by: Jen_Moderator at: 08/27/2019 07:34:53Edited text for better reading. Last edited by: Jen_Moderator at: 08/28/2019 12:17:02New subject after splitting |
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8/27/2019 12:20 PM | |
Posts: 20 Rating: (0) |
Thank you for your reply! Would I need a communication module to establish connection between IoT2000 and S7-1200? |
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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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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