- Talking opc with rslinx classic howto how to#
- Talking opc with rslinx classic howto code#
- Talking opc with rslinx classic howto free#
Libplctag is built around the concept of tags. Just copy-paste the project in your solution folder, Right-click on Solution -> add existing project -> select libplctag.csproj file. To use the wrapper you have to add the project manually to your sources. Static extern int plc_tag_set_int32(IntPtr tag, int offset, int val) Static extern int plc_tag_set_uint32(IntPtr tag, int offset, uint val) Static extern int plc_tag_get_int32(IntPtr tag, int offset) Static extern uint plc_tag_get_uint32(IntPtr tag, int offset) Static extern int plc_tag_set_float32(IntPtr tag, int offset, float val) Static extern float plc_tag_get_float32(IntPtr tag, int offset) Static extern int plc_tag_set_int8(IntPtr tag, int offset, sbyte val) Static extern int plc_tag_set_uint8(IntPtr tag, int offset, byte val) Static extern sbyte plc_tag_get_int8(IntPtr tag, int offset) Static extern byte plc_tag_get_uint8(IntPtr tag, int offset) Static extern int plc_tag_set_int16(IntPtr tag, int offset, short val)
Static extern int plc_tag_set_uint16(IntPtr tag, int offset, ushort val) Static extern short plc_tag_get_int16(IntPtr tag, int offset) Static extern ushort plc_tag_get_uint16(IntPtr tag, int offset) Static extern int plc_tag_write(IntPtr tag, int timeout) Static extern int plc_tag_read(IntPtr tag, int timeout) Static extern IntPtr plc_tag_decode_error(int error) Static extern int plc_tag_status(IntPtr tag) Static extern int plc_tag_destroy(IntPtr tag) Static extern IntPtr plc_tag_create( string lpString) You can find the documentation about these functions on Libplctag Wiki. Just for reference, here are the wrapped functions of the C/C++ library. I personally don’t like to expose C/C++ native methods, instead I usually keep all interop boilerplate inside the wrapper and expose only plain C# functions. There are several approaches that can be taken when writing a wrapper. When you use a native C/C++ library in a C# project, you need a wrapper that contains the P/Invoke of the functions exposed by the C++ library. You can read the documentation with all the steps on the Build.md file. The C# wrapper is also on GitHub Watch the video on Youtube
Talking opc with rslinx classic howto code#
The C/C++ source code of Libplctag is hosted on Github, along with the documentation and issue tracker:
Talking opc with rslinx classic howto how to#
This library is very easy to use and in this article we will see how to use a C# wrapper that I wrote time ago.
Talking opc with rslinx classic howto free#
LibPlcTag works on the Ethernet/Ip stack and is LGPL licensed (you are not forced to open source the entire project, free for commercial use).
It’s a C++ open source library and it can communicate with most of the Allen Bradley plcs, like Micrologix, CompactLogix, ControlLogix, SLC and Plc5. LibPlcTag is a library that I used recently to communicate with Allen Bradley plc.
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