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Forum Index : Microcontroller and PC projects : Modbus
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Mixtel90 Guru  Joined: 05/10/2019 Location: United KingdomPosts: 6792 |
It's likely to be compatible with Schneider / Telemecanique stuff, yeah. That's their standard (Schneider bought Modicon and Telemecanique). In theory it's the definitive spec, but there are no guarantees that it works in every case as it's a de facto standard with no governing body. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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SimpleSafeName Guru Joined: 28/07/2019 Location: United StatesPosts: 319 |
Well, no. :) There are the non-spec specs, which have been largely adopted by by mob rule, not that it is necessarily a bad thing. Here's a link that goes over some of the gotchas out there. https://www.ni.com/en/shop/seamlessly-connect-to-third-party-devices-and-supervisory-system/the-modbus-protocol-in-depth.html |
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| SimpleSafeName Guru Joined: 28/07/2019 Location: United StatesPosts: 319 |
If you carbon date yourself to the AB PLC-2 days (with an occasional cameo by a PLC-1) the Rockwell stuff these days isn't nearly as bad as back then. But you can (and are encouraged) to do some pretty stupid things with the new software. It's up to you if fall for that nonsense. The big push these days is to encapsulate (and encrypt should you choose to) parts of your program to the point that the customer has no choice but to contact you for support. Should you go out of business or retire, tough luck. So yeah, I can easily spend the rest of my days not dealing with that any longer. And yes! The Turck hardware is nice! IP69K for the blocks. I had never heard of IP69K before. And they are small! The PLC (the -11 variant) comes with a webserver built-in. The I/O points can be configured as inputs or outputs. Your analog I/O can be configured a number of different ways as well. Each point provides plenty of power and are well protected. It really looks great. We shall see... :) Here's a video of the FRS module which we are upgrading: https://www.youtube.com/watch?v=50_3r54gIiM&t=73s A bit of background: Any electronics in the FRS unit have to be disconnected and removed to be kept in warm storage (anything > 0C should do) at the end of the drilling season. This is because the FRS unit will be closed up for the Antarctic winter and left unheated where it could get to ~-70C to -80C and the electronics probably will get destroyed. So the Pelican case gets removed and makes its way back to the States each year, and it's huuuge!. The Pelican box that contains the PLC and the HMI can be seen at around the 2:45 mark. At 4:48 you can get a sense of the scale of the Pelican box. By using the Turck PLC we managed to fit the whole enchilada in a 12U server rack. And the parts have been mounted on a plate of aluminum that uses Harting connectors to connect to the system. Two trays contain all of the electronics and can be removed and placed in carry-on storage if you like. |
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| SimpleSafeName Guru Joined: 28/07/2019 Location: United StatesPosts: 319 |
I think that part of the problem is that there is still a lot of stuff out there in active service that dates back to the 80's. And that version of Modbus is your Granddad's Modbus. :) |
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