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Questions tagged [pymodbustcp]

A simple Modbus/TCP client library for Python. pyModbusTCP is pure Python code without any extension or external module dependency.

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pyModbusTCP fails every second function

Basically I'm supposed to test modbus functionality right now and for whatever reason modbus fails to read the registers every second call, ex: Functions: # Modbus functions def read_system_uptime(c, ssh): try: # Get uptime with ubus …
Wowy
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pyModbusTCP Raspberry Pi to PC connection eth0

The story so far. I Set up a Server and Client using the very helpful Johannes YouTube tutorial, initially I did this on the Raspberry Pi without any issues using…
Reowald
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pyModbusTCP acc64 SUnSpec

I am trying to read values from an inverter (for solarpanels). The inverter uses Modbus (TCP/IP) with SunSpec protocol. I am using pyModbusTCP and I can connect to the inverter and get values of type int16 and uint16 but not string or acc64. I am…
DanielG
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How to get the ip of the client that is connected to the modbus server?

I am using ModbusTcpServer(context, identity=identity, address=(listener_address, listener_port)), here ModbusTcpServer is a function that is imported from pymodbus, I want to get the IP of client that get connected to the server for the logging…
UPENDRA BARTWAL
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Raspberry Pi Modbus Client FIFO

I've scoured the internet and can't find anything that will fit my needs. I am trying to figure out if it's possible to set up the PI as a client with a FIFO and have the server read from that FIFO. I have an array of PIs and so I need to have some…
BBridges
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ModbusTCP traffic showing up in WireShark as TCP packets

I am using pyModbusTCP to send ModbusTCP packets on my local host. My code seems to work correctly, but in Wireshark my packets are showing as TCP instead of ModbusTCP. When I go to "Analyze > Enable Protocols" ModbusTCP is enabled. Another weird…
Vic
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How to get pymodbus to correctly communicate with PLC?

Before I ask, I just want to mention that I have spent a few days researching this and can't seem to find my way out of this basic issue. I have read the docs and spent time here. Otherwise I wouldn't have asked. I have inherited a massive…
driv3r
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How do I read and write to a PLC through python code on my laptop via ethernet?

I am doing a project of communicating with a PLC through python code on my Laptop using pyModbusTCP. I am getting stuck on how to go about the process as there isn't much info on the net. I have made a simulation of it using pyModbusServer and…
Sajay Varghese
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Python comunication modbus tcp with plc saia sbc

I am trying to read the registers and flags of the saia sbc PCD2 M4_x ​​plc via Modbus TCP communication. I know the IP address and the communication port of the plc, however every time I read a flag or a register I always get different values…
Tommaso Faedo
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How to shape a CALL in PYMODBUS (Modicon?)

i am in a serius battle with a solar inverter right know (INGETEAM 3play) i am connected by TCP / IP. I need to understand how to shape my call becouse i am not having the answer i want, and also i dont' know how many bits i am waiting for an…
Cristobal Rencoret
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Get data from SMA Cluster Controller using Pymodbus

I am trying to get data from a SMA Cluster Controller using pymodbus, but I don't get any response. In example, the documentation says that request in address 30005 with 2 registers and to the unit 1 I'll get the Serial Number for the Cluster…
Sebastián Olhaberry
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How to take float value with pymodbus TCP library?

I am reading some values from a machine with pymodbusTCP library, but i have wrong values when i read floats. The function to get the values is: def ler_dado(endereco,tipo): if tipo == "float": valor =…
JonP
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PyModbus - trigger an action/function when holding register is read

I've setup a running Pymodbus server based on the 'Updating Server' (v2.5.3) example. https://pymodbus.readthedocs.io/en/v2.5.3/source/example/updating_server.html Everything works ok. Now i want to trigger a function (which will simply increment a…
Bart Loeters
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Negative value prints as big number in python

im pulling data from a modbusTCP server, but when i should receive a negative value it shows as a big number. self.export = self.c.read_holding_registers(37113, 2)[1] I know it has something to do with it being signed or unsigned but im really…
Mads Gadeberg
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