Emergency SOP8 min read
Emergency PLC & VFD Line-Down Replacement Protocol: Mitigate $5k–$50k/Hour Downtime
Step-by-step cold swap SOP, international 24-48h rush dispatch, firmware bricking pitfalls, and gray-market risks.
siemensRead Playbook →
Independent China Distributor & Sourcing Agent · New to Used
China Industrial Automation Distributor & Independent Sourcing Agent for the Parts You Cannot Get Locally
Obsolete, discontinued and hard-to-find PLC, HMI, VFD and sensor parts — new, new-old-stock, surplus, refurbished or used — sourced in China and shipped worldwide.
- 50K+ Critical Line-Down Parts Sourced
- 24h Emergency Turnaround (2-4h)
- 100% 4K Pin & QC Inspection
- Global Global Rush Shipping (DAP/DDP)
About us
Sourcing obsolete and hard-to-find automation parts from China
AO Ctrl is an independent China industrial automation distributor and sourcing agent — not an authorized brand storefront. We source obsolete, discontinued and allocation-constrained PLC, HMI, VFD and sensor parts across the Shenzhen and global supply chain, screen every lot for authenticity, state each unit's condition before it ships, and consolidate multi-line BOMs into one shipment.
Physical Verification & Emergency Dispatch — Zero Surprises
We operate a dedicated Industrial Automation Emergency Sourcing & Quality Verification Desk in Shenzhen. Every confirmed order undergoes physical 4K microscopy and pin inspection before dispatch to eliminate counterfeit re-marking. We prioritize urgent plant MRO breakdowns, system integrators, and firm target-priced requests.
What we coverScope
- Urgent call-offs and repair spares — obsolete, hard-to-find PLC, HMI, VFD inverter, sensor and safety parts from Siemens, ABB, Schneider, Omron, Mitsubishi and more
- Factory-new current-production lines at real availability and lead time
- Multi-brand BOM consolidation — single consolidated shipment and unified commercial invoice from Shenzhen
- DDP for initial orders; EXW/FCA for bulk corporate shipments
Engineering Knowledge & Field Protocols
Industrial Automation Maintenance & Sourcing Guides
Grounded, practical technical playbooks for factory maintenance managers, system integrators, and engineering procurement teams.
Quality & Inspection10 min read
Counterfeit & Remarked Automation Hardware: 4K Microscopy Optical Inspection Checklist
How scrap pulls are disguised as new. Pin re-tinning detection, acid-wash laser etching flaws, and counterfeit screening.
rockwell automationRead Playbook →
Lifecycle TCO7 min read
Obsolete PLC Migration vs. Strategic Spares Buffer: A Plant TCO Comparison
$200k rip-and-replace migration vs. $10k strategic spares buffer. The 1.5x spare redundancy formula for 5-year uptime.
mitsubishi electricRead Playbook →
Brands we stock & source
Siemens distributor and supplier — AO Ctrl is an independent China distributor o...
Schneider Electric distributor and supplier — we source Modicon M221/M241/M251 P...
ABB distributor and supplier — AO Ctrl is an independent China distributor of AB...
Omron distributor and supplier — we are an independent China distributor of Omro...
Fuji Electric distributor and supplier — AO Ctrl sources MICREX-SX and MICREX-NX...
All Products & Spares
Browse the full catalog across all brands: PLC modules, VFDs, power supplies, relays and sensors.