Unterstützung bei Modbus Variablen ^{CODESYS Forge talk (Thread)}
Unterstützung bei Modbus Variablen
Last updated: 2008-12-14

IO SCANNING OVER MODBUS ^{CODESYS Forge talk (Thread)}
IO SCANNING OVER MODBUS
Last updated: 2018-11-15

Modbus RTU Library ^{CODESYS Forge talk (Thread)}
Modbus RTU Library
Last updated: 2021-07-29

Error Modbus RTU ^{CODESYS Forge talk (Thread)}
Error Modbus RTU
Last updated: 2019-09-18

Codesys ModBus TCPIP ^{CODESYS Forge talk (Thread)}
Codesys ModBus TCPIP
Last updated: 2018-09-04

Inverter modbus with raspberry ^{CODESYS Forge talk (Thread)}
Inverter modbus with raspberry
Last updated: 2019-06-28

Raspberry Pi, Modbus RTU ^{CODESYS Forge talk (Thread)}
Raspberry Pi, Modbus RTU
Last updated: 2015-07-16

Raspberry - ModBus RTU ^{CODESYS Forge talk (Thread)}
Raspberry - ModBus RTU
Last updated: 2016-01-26

Modbus Kommunikation überwachen ^{CODESYS Forge talk (Thread)}
Modbus Kommunikation überwachen
Last updated: 2010-02-13

MODBUS RTU ^{CODESYS Forge talk (Thread)}
MODBUS RTU
Last updated: 2009-12-16

CODESYS Modbus Channels ^{CODESYS Forge talk (Thread)}
CODESYS Modbus Channels
Last updated: 2021-08-11

Alarmmanagement Modbus Zugriff ^{CODESYS Forge talk (Thread)}
Alarmmanagement Modbus Zugriff
Last updated: 2011-08-08

Modbus FC6 ^{CODESYS Forge talk (Thread)}
Modbus FC6
Last updated: 2010-03-21

Modbus RTU RS485 ^{CODESYS Forge talk (Thread)}
Modbus RTU RS485
Last updated: 2020-03-07

Modbus Master Lizenz ^{CODESYS Forge talk (Thread)}
Modbus Master Lizenz
Last updated: 2018-01-21

Modbus RTU RS485 ^{CODESYS Forge talk (Thread)}
Modbus RTU RS485
Last updated: 2014-10-21

Modbus RTU - Dynamics channels ^{CODESYS Forge talk (Thread)}
Modbus RTU - Dynamics channels
Last updated: 2017-07-27

Problem with simulation Modbus ^{CODESYS Forge talk (Thread)}
Problem with simulation Modbus
Last updated: 2024-03-22

Modbus TLS Kommunikation ^{CODESYS Forge talk (Thread)}
Modbus TLS Kommunikation
Last updated: 2025-11-06

22kW Wallbox mit Modbus ^{CODESYS Forge talk (Thread)}
22kW Wallbox mit Modbus
Last updated: 2025-11-17

dynamic modbus devices ^{CODESYS Forge talk (Thread)}
dynamic modbus devices
Last updated: 2026-02-13

runtime dynamic modbus devices ^{CODESYS Forge talk (Thread)}
runtime dynamic modbus devices
Last updated: 2026-02-26

Post by bruno-roth on 22kW Wallbox mit Modbus ^{CODESYS Forge talk (Post)}
Hallo, das ist wohl das falsche Forum für Wallboxen :-) Aber ich empfehle dir Die GO-E-Charger die hat eine sehr offene Schnittstelle und API auch mit Modbus TCP https://github.com/goecharger/go-eCharger-API-v2/blob/main/modbus-de.md
Last updated: 2025-11-17

Post by mil581 on Modbus TCP Server connection is ESTABLISHED but all holding registers are value 0? ^{CODESYS Forge talk (Post)}
Hello everyone! I'm facing a weird issue with CODESYS Control Win V3 x64 on a fresh Windows install. The situation is as follows: CODESYS Modbus TCP Server (Slave) is running and I can see live values in the mapping display of Modbus settings: GVL (e.g., 32, 42, 50). Port 502 is LISTENING according to netstat. When connecting via Modbus Poll or Node-RED, the connection status changes to ESTABLISHED and everything reports as fine. The Problem: Despite the successful connection, all holding registers return 0 no matter what. It's like the OS accepts the TCP handshake, the request counter goes up but the data payload never reaches Modbus Client (in this case Node-RED or Modbus Poll). Quick Stats: Firewall: Completely OFF. Unit ID: Verified & Matching. IP: Tried 127.0.0.1 and 192.168.0.1. Interface: Correctly bound in Ethernet Device settings. I already tried absolutely everything from changing IP address, subnet, port, deleting the project and starting new one and even nuking my old Windows install. Since I am near completion of my bachelor thesis only thing left for me to do is connect SoftPLC to NodeRED via Modbus but this issue is driving me crazy for weeks. I do not know what to do anymore.
Last updated: 2025-12-25

Post by hagroth on v3.5 SP19 - Modbus TCP Devices - Channel Limit? ^{CODESYS Forge talk (Post)}
Today I was struggling with the same problem. in search for a solution i found this thread. Then i tried some things. It doesn't seem to be just a libraries' fault. In addition to 3.5.19, we also have a 3.5.18 version installed, the library versions of Modbus_TCP_Master and Modbus_TCP_Slave are the same, but more than 10 slave channels can be added in 3.5.18
Last updated: 2024-02-02

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