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Questions tagged [libnodave]

Libnodave is a library that provides the necessary functions to connect to and exchange data with Siemens S7 and S5 PLCs

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Read M0 byte from a Siemens PLC S7-200 (COM protocol)

I'm working with a Siemens PLC SIMATIC S7-200 and also a VB.NET program to communicate with it (and using libnodave library for that). I am quite familiar with all this, but I can't figure out a couple of things and I'm hoping some of you could help…
Pspl
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Which protocol to use if communicate with simatic plc over tcp/ip

I am using libnodave and s7netplus to read and write data blocks to my simatic s7-300. Everything is working fine but I want to understand how libnodave or s7netplus are workingso that I can implement something similar in c++ or c# myself based on…
Michael
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Reading Siemens S7 PLC symbol table

I would like, for educational purposes, to read PLC symbols table by using libnodave (or any equivalent open-source like snap7). Actually, when I read data from merkers, I must know in advance what kind of variable will be present in the DB, also…
PeppeA82
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Troubles to connect to Siemens S7 probably cause of bad protocol used

I encounter many troubles to connect to the PLC, for that, I use the libnodave library. Here are the last informlations I got : CPU 412-2 Communication : CP 443-1 So far, I manage to connect to the automaton, but, if I use the - UserTransport…
romulus001
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Read data from PLC with Delphi and libnodave library

I’m here again with a new question; this time about PLC. I start by saying I’m new of PLC and I’ve never saw one of them until a couple of month ago. I’m asked to write a program that read, from Delphi, some data from a PLC Siemens S7-300 in order…
Eros
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libnodave java - duration of "read" operation

I have made a little program in java (with NetBean) that uses libnodave libraries libnodave-java.0.1 for reading a byte every 500ms (Interval). I was disappointed by the reading operation duration, that is around 250ms (dt). This is my main class.…
ste.cape
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C# app connection with Siemens S7-200

I have an issue with getting data from PLC to PC. I have S7-200 and CP 243-1 communication module. I need to read data from PLC. I have read a lot about libnodave library and tried to write an app for myself for communication and downloaded sample…
Jivopis
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Multiple connections to CP 343-1 with LibNoDave

I want to make several connections to a CPU 315-2 DP with a CP 343-1 module. Within the software I can make one connection to the device, but the second connections fails to connect and returns -1 in the function connectPLC. A similar question is…
Bojo
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Working on emulator but not on android phone

I am developing an application that contains libnodave library(Connecting with Siemens PLC). I want to simply read some data and put in on the android screen periodicly.The App is working on the emulator just fine, but on real device I am getting…
Mete
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New to MVVM WPF, getting data from external source

I'm new to MVVM, and I'm a bit in over my head here. English is not my preferred language, so please bear with me. I'm trying to make a HMI for PLC. I'm supposed to connect to two different PLC, and present data from different datablocks in the…
Naustdal
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Unable to read data from DB in Siemens S71500 using libnodave and Java

I am able to read data from Siemens S7300 using libnodave, but I was unable to read the data from Siemens S71500. In the code you can see that I am trying to read first 4 bytes of Data from DB2. The code runs successfully with S7300, when I change…
cricketfan
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