AB CNC Controller Obsolescence Analysis
Analysis of Allen Bradley 9/Series CNC controller obsolescence across the PSI machine fleet. Identifies machines needing CNC retrofits, completed retrofit history, and comparable pricing for quoting.
Background
Allen Bradley (Rockwell Automation) exited the CNC controller business entirely. The 9/Series CNC (8520/8500 product family) has no successor product — unlike PLC-5 which was replaced by ControlLogix, there is no Allen Bradley CNC to upgrade to. Rockwell chose to focus on PLCs and drives rather than compete against FANUC and Siemens in the CNC market.
This means every machine still running a 9/Series CNC requires a cross-platform migration to a different CNC manufacturer — typically FANUC (30i/31i series) or Siemens (SINUMERIK 840D).
Fleet Status (March 2026)
| Metric | Value |
|---|---|
| Machines still on AB 9/Series CNC | 59 |
| Machines already CNC-retrofitted | 65 (75 retrofit projects) |
| Unique customers needing upgrade | ~40 |
| Estimated pipeline value | $10M - $54M |
| Controller manufacturer status | DISCONTINUED — Rockwell exited CNC market |
Key Findings
Obsolete Controller Components
The following AB 9/Series CNC components are discontinued with no OEM replacement:
- 8520-CP / 8520-PX3 / 8520-EPX — CNC processors (9/240, 9/260, 9/290)
- 8520-OPC1 / 8520-MOP / 8520-FOP — Operator panels
- 8520-MTB — Machine tool builder panel
- 8520-ASM3 / 8520-SM4 — Analog servo modules
- 8500-E154 / 8500-E153 — Digital I/O modules
- 8500-ANIO — Analog I/O module
Spare parts are aftermarket-only (used/surplus), with prices ranging from $300-$4,600 per module.
Replacement Platform
PSI CNC retrofits use:
- FANUC 30i / 31i — Most common. FANUC CNC controller with Alpha series servo motors and drives.
- Siemens SINUMERIK 840D — Used on select machines.
Each retrofit includes: CNC controller, servo motors with custom PSI adapters, servo drives, new control enclosure with cooling, power transformer, safety interlocks, HMI, complete wiring, and engineering drawings.
Completed Retrofit History
PSI has completed 75 CNC retrofit projects since 1998 across 65 unique machines. Key customers include Boeing, Pratt & Whitney, GE Aviation, Caterpillar, Tinker AFB (DFAS), Delta Air Lines, KLM, Siemens, and Chromalloy.
Recent retrofits (2023-2025): jobs 95791, 95805, 95817, 95820, 95841, 95876, 95877, 95905, 95906.
Pricing by Machine Type
| Machine Type | Avg Retrofit Cost | Range | Completed |
|---|---|---|---|
| Special Machine | $529K | $265K-$1.76M | 8 |
| Blast Room | $413K | $239K-$846K | 7 |
| Large Auto Door | $309K | $145K-$845K | 13 |
| Spindle Door | $311K | $190K-$367K | 6 |
| Swing Door | $311K | $192K-$540K | 8 |
| Std Robot/Swing Door | $248K | $131K-$381K | 10 |
| Small Auto Door | $115K | $112K-$118K | 2 |
Data Sources & API Endpoints
This analysis was built using the PSI.UniData.API endpoints:
| Endpoint | Purpose |
|---|---|
GET /api/obsolete-parts/dev/search | Find obsolete AB CNC parts by description/manufacturer |
GET /api/obsolete-parts/dev/by-project/{job} | Check obsolete parts in a project BOM |
GET /api/obsolete-parts/dev/{pn}/chain | AI-powered replacement chain (Azure OpenAI) |
GET /api/project/dev/search?q=CNC | Find all CNC-related projects by description |
GET /api/project/dev/{job}/info | Project details (customer, location, machine type) |
GET /api/project/dev/{job}/lineage | Find retrofits via successor projects |
GET /api/bom/dev/part/{pn} | Explode retrofit assembly part BOM for scope detail |
GET /api/manufacturer/dev/by-part/{pn} | Manufacturer/design category for a part |
Project Search Endpoint
The GET /api/project/dev/search?q={keyword} endpoint was added specifically for this analysis. It searches all PROJECT.1287 descriptions (case-insensitive contains) and returns matching projects with customer, location, and status. This is how the 75 CNC retrofit projects were identified — searching for “CNC” across all ~2,000+ project descriptions in under 600ms.
Obsolete Parts AI Chain
The GET /api/obsolete-parts/dev/{partNumber}/chain endpoint uses Azure OpenAI (GPT 5.2) to parse free-text PRODUCT.NOTES and extract replacement part numbers. Results are cached (7-day TTL). This was built to resolve replacement chains but also useful for understanding part supersession history.
Methodology Notes
What Worked
- Project description search was the key to finding CNC retrofits. Searching for “CNC” in PROJECT.1287 descriptions found all 75 retrofit projects in one query.
- Retrofit part BOMs (exploding the PSI-made assembly part like “95877 - CNC/PRIMS RETROFIT OF PROJECT 1507”) show the exact retrofit scope — what gets installed.
- Machine type matching for comparable pricing — same machine type retrofits have similar scope and cost.
What Didn’t Work
- BOM hardware classification (searching for ControlLogix/CompactLogix parts in retrofit BOMs) found zero results because PSI uses FANUC and Siemens, not Allen Bradley, for the replacement CNC. The search criteria were wrong.
- Original vs retrofit BOM diff — retrofit projects share the same BOM as the original machine (modified in-place in AFTEC), so comparing them shows zero differences. The retrofit scope is in the retrofit assembly part’s own BOM, not in the project BOM diff.
- Brute-force BOM scanning of all retrofit projects (474 BOMs) was slow and missed results. The project description search was 100x faster and more accurate.
Key Insight
Allen Bradley exited the CNC business. The replacements are FANUC and Siemens. Any search for “ControlLogix” or “CompactLogix” in CNC retrofits will return nothing — those are PLC products, not CNC products. The CNC market and PLC market are different product categories.
Reports
Reports are stored in OneDrive > Reports > Machine Reports:
| File | Content |
|---|---|
AB_CNC_Master_Report.xlsx | Full fleet analysis: 59 machines, warm leads, completed retrofits, timeline |
AB_CNC_Master_Report.docx | Executive summary with Rockwell position, PSI track record, customer messaging |
AB_CNC_Retrofit_Comps.xlsx | Comparable pricing: each machine matched with closest completed retrofit |
AB_CNC_Retrofit_Comps.docx | Pricing analysis by machine type and scope |
AB_CNC_Retrofit_Scope.docx | Detailed BOM breakdown of 3 recent retrofits |
Related Pages
- PSI.UniData.API — REST API used for all data queries
- PSI MCP Server — Has
assess_obsolescence_riskandcompare_projectstools