Rslogix 500 81000 Cpr9 W Master Disk Exclusive ((install)) -

This article is designed to address the niche demands of industrial automation engineers, system integrators, and legacy PLC maintenance teams who require specific, vintage software for older Allen-Bradley systems.

  • If using a Serial (DF1) driver, ensure the configuration does not have "Exclusive" checked if it is not required for your specific programming cable setup.
  • Return to RSLogix 500 and attempt to go online.

    • Verify exclusive status

    Perform changes and download

    Steps

      • Use Controller Properties / PLC menu and select "Master" or "Become Master" (menu labels vary by RSLogix version).
      • Alternatively, in RSLinx or Who Active, right-click the controller and choose options to request master.

      6. Precautions for Current Users

      • Hardware Key Critical: If the “Master Disk Exclusive” hardware key is lost or damaged, the software becomes permanently unusable. Rockwell no longer provides replacement keys for this version.
      • No Modern OS Support: Running this software on modern 64‑bit Windows requires a virtual machine (e.g., VMware or VirtualBox) with a 32‑bit Windows XP or Windows 7 guest OS.
      • Security Risk: Using an unsupported software version on a plant network connected to the internet poses a cybersecurity vulnerability. It is strongly recommended to air‑gap or segment the programming workstation.