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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

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Reading and writing data from Temperature Controller using RS485 and Modbus (Python or LabView)

I have a problem that might seem really easy for people used to working with serial interfaces, but it is the first time for me. We want to automate our temperature-dependent probe station by using a temperature controller (CB100 / CB400 / CB500 /…
Sir Fumi
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Unable to establish connection with Pymodbus TCPserver

I am setting up a new TCP Server connected to client through an Ethernet TCP/IP modbus and is supposed to push certain values to a given modbus register (hr = 6022), every few seconds. I do not see any exceptions/errors raised by the script but no…
MuizVhora
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How to solve modbus error on solar inverter?

I am currently working with one of Growatt inverters, 5 KVA residential inverter, It has two ports one is RS-485 I have connected a Smart Energy Meter with it to control backpower flowing to grid, and on the other port Growatt wifi device was…
Muzzammil Hussain
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AttributeError: 'ExceptionResponse' object has no attribute 'registers' in pymodbus

I would like to read the temperature from an SMA STP6.0 solar inverter using code based on pymodbus using the modbus TCP protocol. To start I run the Sunspec Client Example from…
Alfred Elkerbout
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storing modbus register address and corresponding set values to mysql database

I am trying to run a Modbus server code which just stores the Modbus register address and corresponding values to MySQL database. for example, I want to send a command to the Modbus server to set 40001 address value to 25. Modbus server just saves…
JIIM
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Exception Responce (131, 3, IllegalAddress)

I know this may seem like a duplicate question but the answers provided didn't solve the issue I am having. I am writing a program to read in analog channels from an ADAM 6017 using pymodbus. To start I am just asking for the first holding register…
Michael H.
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issue in installing pylibmodbus and cffi

I am not able to install pylibmodbus library as cffi is not installed. If I try to install cffi I get the following issue pi@raspberrypi:~ $ pip3 install cffi Collecting cffi Using cached…
shan
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How should negative numbers be represented in the pymodbus input register?

I want to assign negative numbers to the input register in a pymodbus asynchronous server. I have a 5 element array named PQV that contains numbers with magnitude ranging from 0 to 300, but some of the elements are negative PQV=[145, -210, 54,…
JLEM
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How to integrate different modbus devices on a web system?

I have two PLC modbus devices. These two are different companies. The first one is that A will return the temperature and humidity. The second is that B will return five values. In both devices, the connection is modbus TCP. One problem is that the…
frank
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from pymodbus.constants import Endian throws an error

I'm trying to learn and program using pyModbus. I have an example program which is running fine. It has this code to import the ModbusClient from pyModbusTCP.client import ModbusClient which works ok. Now I'm trying to run and understand one…
RDK
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C# equivalent for pyModbus

I would like to develop a C# application to monitor a Sick PLC using modbus. I have an example program for talking to the PLC which is written in Python and uses the module pyModbus. Is there a C# nugget package that has the same functionality as…
Andrew Seaford
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pymodbus: Modbus RTU read register call blocked & never woke up or Auto-reconnect to Modbus RTU device

I am trying to create Modbus RTU client which will read data from serial port using pymodbus library. I am able to connect to Modbus RTU running on COM2 in Windows10 & able to read data of different types like Int32, Float, etc. Issue: After some…
OO7
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Pymodbus: Modbus RTU using reactor - callback never called

I am trying to create Modbus serial/RTU client which will read data from serial port using Pymodbus library. Python: 3.6 Pymodbus: 2.1.0 Platform: Linux/Windows My sample code base is given below: def readDevices(modbusRTUDevice): deviceIP =…
OO7
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Is is possible to control %QX0.0 LED light through OpenPLC ModBus?

just started my OpenPLC journey and created my first project using the tutorial and was wondering is It possible to turn on the LED through a packet sent to the default ModBus server port 502 instead of pressing the button physically? I have been…
Desmond Li
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How to write INPUT REGISTERS using pymodbus for external Modbus client which will read them

I have been tasked with implementing a pymodbus-based Modbus server. The server will run on a Linux machine like a Raspberry Pi or Up2 controller. It is expected to interface with a Modbus client which I have no control over. That external Modbus…
Akash Sharma
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