Stack Overflow
Stack Overflow

Questions tagged [pymodbus]

Pymodbus is a python implementation of modbus protocol providing both client and slave features.

PYMODBUS is a full modbus implementation of modbus protocol using python. It provides both client and server features and supports Modbus over RTU, ASCII, TCP, UDP protocols. The library also supports both synchronous and asynchronous variants of both client and server features.

Pymodbus is supported on both on python 2.7 and python 3.x

For more info refer

290 questions
0
votes
1 answer

Modbus TCP/IP on RaspberryPi wit PyModBus

I need to communicate with several modules and devices using the ModBus Protocol and the Raspberry Pi. I am using PyModBus on Raspberry Pi to read/write Modbus function codes. (https://pymodbus.readthedocs.io/en/latest/readme.html) I was able to…
wardandr5760
  • 11
  • 1
  • 3
0
votes
1 answer

PyModbus failing to read input registers in RTU Over TCP

I tried to read Modbus signal using pymodbus but got error The source is as follows: There is a MAC address notification function when the server responds to TCP. How can Modbus communication be possible without error? How do I remove the TCP header…
seokjoo park
  • 11
  • 3
0
votes
0 answers

Representing Modbus data using Timeseries

Is it possible to represent Modbus data in a time series format using Python for example? I would like to see how Modbus data changes over time using time series. Do you think this is useful anyway or it depends on what you are looking for behind…
Avv
  • 429
  • 4
  • 17
0
votes
1 answer

How to subprocess a pymodbus tcp server in a python unit test and terminate it after all the tests have been executed?

I will try to give you some context before presenting the issue I am facing. I have a component called Actuator which relies on the module pymodbus. When I tested this component, I did it in the easiest possible way using a modbus TCP server based…
Rick
  • 11
  • 2
0
votes
1 answer

Read RTU Pymodbus data through TCP/Forwarder

I have Energy Meter connected through RTU and i am able to get holding registers data through simple RTU Code. Now i want to make Convert this RTU to TCP through Forwarder. I want to send data to TCP which forwards the command to RTU and fetches…
Abbad
  • 13
  • 3
0
votes
0 answers

How can i read register pymodbus with usb rs485 to modbus device?

i want to read register from Modbus Device(Now modbus device is Tekon CC15) But i always got error. This is my code: from pymodbus.client.sync import ModbusSerialClient as ModbusClient modbus = ModbusClient(method='rtu', port='/dev/ttyUSB2',…
Göktuğ Ozleyen
  • 121
  • 2
  • 14
0
votes
0 answers

Problem reading registers from Carlo Gavazzi EM24-DIN.AV5 using Python / ModBUS

Dears, I have a Carlo Gavazzi Energy Meter EM24-DIN.AV5 and I'm connecting it with Raspberry PI using USB/RS485 converter (zk-u485). The A/B/GND ports of USB-RS485 are wired with ports 41/42/43 of the device. The device have a Joystick to configure…
SA Smart Tech
  • 1
  • 1
0
votes
0 answers

pymobbus write SINT16 bit

In my project I need to write negative intager in a PLC 1200 siemens. Now I'm using Pymodbus to write and read my register but I can't find a way to write negative integers because the console show me always this error: "struct.error: argument out…
Giuseppe
  • 39
  • 1
  • 9
0
votes
1 answer

Read an holding register bit by bit Siemens

I need to read a Siemens 1200 holding register bit by bit with python, searching on the web I found PyModbus an excellent library, but with it I'm only able to read the holding register such an integer and not bit by bit. This is the code: from…
Giuseppe
  • 39
  • 1
  • 9
0
votes
1 answer

Broadcast messages ignored by slaves

Description I currently have a RS-485 bus with 3 Raspberry Pi each running pymodbus (sync - 1 master/client and 2 slaves/servers). Sending commands to each server's individual address is working as intended. However, broadcast messages to address 0…
MattsInsomnia
  • 41
  • 3
0
votes
1 answer

Custom Datablock Example in pyModbus

I'm trying to develop custom datablock functionality using pyModbus and am following the example in their documentation: https://pymodbus.readthedocs.io/en/latest/source/example/custom_datablock.html The critical code is here, where they overload…
Kile
  • 41
  • 5
0
votes
0 answers

Pymodbus - Someimes runs & sometimes runtime Error

I am using RS485 to USB Converter for commmunication. I am trying to read input registers but sometimes its result comes and sometimes not. I am using pymodbus-2.3.0 external library & I use pycharm for the code. import logging from…
Yash Akbari
  • 13
  • 4
0
votes
1 answer

PyModbus failing to read holding registers

I'm trying to use PyModbus 2.3.0 to read the values from some holding registers on a Siemens S7-1200 PLC. I've set up some ladder logic to test this out on the PLC, with some registers holding random floating-point test values. I'm trying to do this…
fherder
  • 11
  • 5
0
votes
0 answers

PyModbus asyncio copier - slower copy configuring two pairs of source / destination pairs instead of one pair

I have modified PyModbus Async Asyncio Client Example and created a program (see below) to copy coils and registers from one PLC to another. There is a main thread and a thread for each node(PLC). The modified code works reasonable well. But it…
George V
  • 1
  • 1
0
votes
0 answers

Pymodbus TCP Slave Busy

I've been trying to update someone else' software to work on a new machine. They built a Modbus controller using the Pymodbus library to work with the main software. The only difference between the original working machine and this new one is that…
JKLetia
  • 1
  • 1
1 2 3
…
19 20