If you intend to use RSLinx Classic to communicate with other 64-bit applications on the same PC via an OPC interface, be advised that Windows 64-bit processes them differently. If you run into communication blocks using basic activations (like Single Node or OEM), Rockwell Automation recommends upgrading your license to to establish proper OPC mapping between 32-bit and 64-bit environments. 💻 System Requirements OS Support: Windows 10 (v1803 or later) and Windows 11.
If you're running a 64-bit operating system, you'll need to download the 64-bit version of RSLinx Classic to ensure compatibility. The 32-bit version of RSLinx Classic may not work properly on a 64-bit system, leading to errors and communication issues with your PLC. rslinx classic download 64 bit