In practice, the software's role is critical for large-scale operations. It supports everything from remote online program changes via modem to displaying live production metrics on a centralized web server. While free versions like RSLinx Classic Lite exist for basic controller programming and firmware flashing, the Gateway edition is distinguished by these advanced remote connectivity features.
| Version | Best for | Can act as an OPC Server? | Remote clients (DDE/OPC)? | | :--- | :--- | :--- | :--- | | | Programming a single PLC (free) | No (local OPC only) | No | | OEM | Machine builders (single PC) | Limited | No | | Gateway | SCADA / plant network | Yes – full OPC/DDE | Yes (multiple remote clients) | | Professional | Large diagnostics | Yes | Yes (plus advanced tools) | rslinx classic gateway download