Micro800 Modbus RTU Serial Configuration

[@davebrown6915]

An old protocol but still very much alive and in use in critical applications. I have used it on a daily basis for communication between PLCs, telemetry outstations and PID controllers. Used both over RS-232 and RS-485.

[@TimWilborne]

Great application example. Thanks for sharing Dave.

[@johnbryan1523]

Wow great video about the need for modbus. This gives an option especially in the days of long lead times and slipping delivery dates. Thanks again for letting us have an option.

[@TimWilborne]

You are welcome!

[@JonathonVarvel]

Hi Tim I am a massive fan of your channel!! I was wondering if you have any plans on making a video of setting up a Micro820 plc to read and write using Modbus RTU to a GuardMaster 440C Cr30 I feel like that would be a great video!!! Thanks for all the help on everything you do to help the community with your videos!!

[@TimWilborne]

No, I don't have any on CR30 communication. That would be a good one!

[@Dachief54]

I literally just started trying to figure out how to do this for a relatively large project at work yesterday, and suddenly this pops up in my notifications.

[@TimWilborne]

Glad our timing was good 😊

[@gar232010]

Thank you so much for sharing this video; it is a valuable lesson

[@TimWilborne]

You are welcome. I am glad it was helpful.

[@raulosvaldocruz1471]

Thank you very much Tim good explanation , very clear

[@TimWilborne]

You are welcome.

[@Th3Su8]

I appreciate how you show the ease of implementing modbus in a Micro800 project. Thanks for this. I do have a question or two though. Is that fan motor you have connected to the drive a 3 phase motor? If so, where do you get something like that? I have been wanting to put together a small trainer with a small motor, but have been unable to find one small enough to make it economical.

[@TimWilborne]

Yes it is a 3 phase motor. Just google 3 phase axial fan and several will come up, they are on our trainers as well. twcontrols.com/plc-trainers

[@chaofang2921]

Hello Tim, thanks for this video. I’m new to the PLC. To do this RTU connection. I could not connect to CCW. Did you connected it with Ethernet TCP/IP first? I’m sorry for this very noob question.

[@TimWilborne]

See if this video helps. kzbin.info/www/bejne/eIaagGuBjcuXhqM

[@tirongunawardana5990]

thanks to sharing your knowledge

[@TimWilborne]

You are welcome!

[@ItachiUchiha-wq5ck]

Nice video! I would like to ask if I can connected other VFD, like for example an ABB ACS880 VFD using the modbus communication in Micro850? Thanks!

[@TimWilborne]

You should be able to. Make the make sure they baid, parody, and stop bits match then find the correct data block

[@kalhonaho01]

Hi Tim, Great video. Do you think a third party sensor like xy-md02 temperature and humidity sensor be used with micro820 plc.

[@TimWilborne]

I'm not familiar with that sensor but Modbus is a universal protocol. It works across brands.

[@sergiolopez-so1yx]

excellent video sir Tim, it would be incredible if you talked about the new version of the software CCW 20.01

[@TimWilborne]

I have looked at it, nothing majorly different from 13. What I want to know is what happened to versions 14-19 😂

[@jayabalank-f5m]

Micro820plc rs485 writing command works but reading cannot possible. What problem

[@javierfranco9357]

Hello Tim, do you have any recommendation for the wiring or extra "protection" for the serial port? We don't exactly know how, but this year some final users damaged 2 PLCs (Only the serial port).

[@TimWilborne]

You want an RS232 optical isolator. I don't have a specific one I recommend.

[@jeremykoenig5004]

Hi Tim, I'm using CCW V22 and things look a bit diferent. It looks like the ReadLocalParam/ WriteLocalPeram once created dont appear in local variables for prog1 only appearing in Global Variables now it seams. Or have i done something wrong? Thanks for your time

[@TimWilborne]

You can create them at either scope. If you need to move them, delete them from one, then you can add them to the other.

[@darrelljourdan9926]

Very good info.

[@TimWilborne]

Glad you think so!

[@ANDREYJF]

hey Tim, very good your videos, I'm from Brazil, here there is little application with rockwell, do you have any modbus rtu communication video with MICRO820 X WEG CFW500 X HMI SHNEIDER MAGELIS, tnks

[@TimWilborne]

It would work the same. You just need to make sure you have the baud, parity, and stop bits correct and you know the parameter number you want to read and write to.

[@8033481824]

I have a project that I had working using Modbus RTU talking to a single axis (PCON) IAI controller. We have hit many snags as we progressed to a IAI RCON multi axis controller. I did not design or suggest the devices involved. The present problem is as I add a message block RTU or TPC the variables are automatically set up but with a additional upper level or header for lack of a better term . It would help to send pictures to be clear. In my original project I moved the variables to the global variable table and manipulated several variables as needed. I can not figure out how to get to these variables with the header in place. If there is a better place to give you information to help please let me know...

[@TimWilborne]

That is a real specific question about IAI and I don't have experience with them. Have you reached out to them?

[@8033481824]

@@TimWilborne I think I have confused you. The issue is adding a message function block in AB's CCW program. I am trying to insert a Modbus TPC Message instruction. In your example (a RTU message block) when you insert the message block you get a group of local variables In, Cancel, LocalCfg, TargetCfg etc. I get the same variables but under another level / header. I cannot change the values. I cannot delete the upper level, I cannot copy out the variables away from the header. I the earlier application i had the same variables as your example. I am going to attempt to put a screen shot on your fb page or message not sure if that will work.... thanks!

[@TimWilborne]

Not sure what you mean by header.

[@8033481824]

@@TimWilborne sent a message in you tube

[@MrTinus212]

Hi I am struggling to aquire data the msg function keeps saying error 137 which is a non-standard reply. what could the problem be?

[@TimWilborne]

What is your SubErrorID?

[@shubhamkasabe9866]

What's mean by Error I'd 55..

[@matioz9125]

Just ok