Matrix user forums

Hello! Finally, the Modbus is working now, the change in the UART properties, i.e., Parity and Stop Bit, is achieved, as per what Ben mentioned in his previous post about using the C blocks to change the functions. One will need to ...

Hello! Ben Good evening If you want to do the fix using C code then you can add this line to a C-icon after initializing the Modbus component. I tried one setting at a time in the C block, no doubt as you said after initializing the Modbus, also made necessary changes in the MODSCAN32 ...

Hello Abhi, If you want to do the fix using C code then you can add this line to a C-icon after initialising the Modbus component. Odd parity on UART channel 1 U1CON0 = U1CON0 | 0x02; Even parity on UART channel 1 U1CON0 = U1CON0 | 0x03; Two Stop bits on UART channel 1 U1CON2 = ...

Hello! I am using the MODBUS Slave component, the PIC chip is 18F26K42 running @16Mhz, everything is working good for the moment when communicating with MODSCAN32 or RADZIO on computer, but i am facing problem while communicating with ...

... with all kinds of equipment. I'll add it to the list and see how complex it would be to add to the base UART comms. From there adding it to the Modbus component etc should be a doddle. My customer is using 17 odd number of slaves in one loop of Modbus master (Computer in this case) and the parameters ...

... I want to use the GSM module to help me to monitor the home security by sending me the SMS only. I thought about the next model: Arduino Mega is a Modbus Master with up to 32 slaves/nodes. Modbus allow you to use the long wire/cable with good results. Each slave (based on Nano/Uno) can have up ...

Hello, The problem is that a number starting with a 0 is interpreted as an octal number in C. Hence the problems with addresses 8 and 9 which are outside the range of an octal digit. Try just using the values 8 and 9 instead of 0008 and 0009, hopefully they will work correctly for you. More info her...

... just specific to the one you are using? Initially it does perhaps sound like a bug somewhere especially if your PC shows correct. Not an expert in MODBUS but I do have Master/Slave emulators and some basic hardware that I can use to perhaps replicate issue if it helps. Bit busy just now but happy ...

Hello! I am working on MODBUS Slave and i noticed one problem (i am not sure if this is a problem or it is like that only), when i assign SetHoldingRegister or ReadHoldingRegister in a sequence all goes well till i assign Coil Address ...

Hello, I looked in the drivers available for Flowcode, and didn't see anything for OPC UA. One of the positives of Flowcode is the Modbus Client/Server modules, but I'd prefer OPC UA since it can pull a tag direct out of either SCADA systems or PLC's directly. That being said, is there ...

Thank you Simon.

Hi Viktor, Modbus Poll is $129, I purchased Poll and Slave together and it was £167.40 UK all in. The website is https://www.modbustools.com/order.html As I said, I have it working now but I can't set it up so that I can look at ...

What is the cost of Modbus Poll license?

Hello! Simon

I am happy to hear your project is working, thank you.

Abhi

Thanks again for your help Abhi, I have this working now. I can't display all of the slaves on the PC screen, using Modbus Poll, at the same time, but I can look at each slave individually, which I think will work with the PLC as the program can just call each slave individually. ...

Hi Abhi, Thanks very much for your reply, OK on the start addresses, I will give that another go, I have brought a Modbus Poll licence and I am wondering if thats whats causing my problem, it seems that I should be able to open several windows in it and look at different registers ...

... remain same by mistake then the master do some error in reading the values from 2 same slave address. I always use the ADAM -4561 to test the modbus slave working on computer, i use MODSCAN-32 on computer. I notice in your chart, you have mentioned 8 addresses for input and coil 1 for analog ...

... that this is just a master talking to one slave. I have that working fine, it's adding additional slaves to the mix that is causing me the issue. Modbus Poll flags up an error if you re-use the same addresses for additional slaves. I am sure that if I can change the starting addresses from the ...

Hello! Simon

I will check your chat once i get free, can you check the below link, if it is of any help.

viewtopic.php?p=101424#p101424

Abhi

... your help with this. I have attached the code I have working as a master- single slave setup, not that there is much of it at the moment, the Modbus part is the bit that's new to me, so I thought I would get that working first. I know that the code isn't quite correct to eliminate time out ...

Hello! Simon

Is it possible for you to post the chart to understand better, i have worked on RS485 slave, i will try my best to help/explain.

Abhi

... posts and help pages but can find no help or instructions on this. I am making a device that uses 10 identical PCB's that collect data and using Modbus RTU over RS422 send the data to a PLC for distribution on to a company network. I am using MAX 491 RS422 transceivers and I have the hardware ...

Good evening.
Help solve the problem with Modbus RTU.
The master sends the request, the slave receives it correctly and executes it.
The slave sends a response is not correct. (Only the low byte)

... ---> save sensors data in multiple variables in Arduino mega ---> send all sensors data from arduino to esp2866 ----> send said data from esp to modbus Master (wincc program in my case) all the while I have the ability to send data in reverse , say from "wincc" program to esp to arduino I've ...

... now with flowcode. :D :D - now I want to transfer variable values from arduino to esp8266 and make them available for "wincc" program "through MODBUS TCP/IP" protocol. is that altogether possible with flowcode 8 ? or even v9 should I open a new thread for that ? sorry for inconvenience :oops: