Verdict: 4.5/5 Stars Despite its age, this remains the gold standard for programming the Allen-Bradley MicroLogix and SLC 500 families. It is stable, fast, and a necessity for any facility running legacy Rockwell Automation hardware.
You might ask: Why not just download RSLogix 500 v12 or later from Rockwell?
Here is the compelling case for the 81000 CPR9 Master Disk Exclusive:
| Aspect | Modern RSLogix 500 (v12+) | CPR9 Master Disk Exclusive | |--------|---------------------------|----------------------------| | Activation | FactoryTalk Activation – requires internet or phone call | No activation – disk itself is license | | OS Compatibility | Windows 10/11 (64‑bit) only via virtual machine | Native on XP/Vista, ideal for legacy panels | | Driver support | No 1747‑PIC driver (DH‑485 via UIC only) | Includes 1747‑PIC for old PC serial ports | | Offline use | Requires periodic check‑in (depending on license) | Works completely offline forever | | Cost | $1,000+ per license (or subscription) | One‑time purchase (if found) | rslogix 500 81000 cpr9 w master disk exclusive
For a plant with 20 SLC 5/03 processors communicating over a legacy DH‑485 network running on industrial Pentium PCs, the CPR9 Exclusive Master Disk is irreplaceable.
If you have the 81000 CPR 9 Master Disk Exclusive, but you want to use a modern Windows 11 laptop, there is a hybrid solution: Verdict: 4
Alternatively, Rockwell offers a Paid Migration License—you can send your 81000 Master Disk back to Rockwell (via a distributor) and receive a discounted upgrade to Connected Components Workbench or Studio 5000 Logix Emulate. However, most purists refuse, preferring the raw speed and stability of the CPR 9 exclusive environment.
Error Message:
Error 81000: Master Disk Exclusive
(Alternatively: "Failed to open file. The file is in use by another application" or "Master Disk Protection Error") You might ask: Why not just download RSLogix
Context: The user attempts to open an existing project or go online with a controller. The operation fails immediately before the project interface fully loads. This is often observed in CPR9 installations running on Windows 10 or Windows 11, or when project files are located on network drives.