What is AS/RS automated warehouse? Principles, system types & applications in Vietnam

AS/RS (Automated Storage and Retrieval System) is an automated storage and retrieval system that uses robots, conveyors, and integrated control software to manage the process of receiving, storing, and retrieving goods without manual intervention. In Vietnam, this technology is being adopted by manufacturing plants, logistics warehouses, and distribution centers to optimize operational costs and increase productivity.

What is an Automated AS/RS Warehouse?

AS/RS is a fully automated warehouse system that combines storage structures (high racks, conveyors), picking robots (SRM — Storage/Retrieval Machine), and a central control system (WMS + PLC). Instead of employees running through the warehouse to find, pick, and transport goods, AS/RS automates the entire process within 2-4 hours with an accuracy of 99.5-99.8%.

Short definition: AS/RS is a comprehensive warehouse automation solution, consisting of high storage racks (8-15m), SRM robots, PLC/WMS control systems, and conveyors. It reduces labor by 40-60%, increases order processing speed by 3-5 times, and achieves accuracy up to 99.8%.

Common Types of AS/RS in Vietnam

In Vietnam, three main types of AS/RS are deployed: Unit Load ASRS (handling heavy pallets/boxes of 500-2000 kg), Mini-Load ASRS (high-speed small item picking), and Carousel ASRS (compact storage, suitable for limited spaces). The choice of type depends on the volume of goods, warehouse area, and product type.

• Unit Load ASRS: Used for pallet warehouses, handling individual pallets or boxes. The SRM robot lifts loads of 500-2000 kg, with a speed of 1-2 minutes per pick. Suitable for manufacturing plants and raw material warehouses.
• Mini-Load ASRS: Picks small items (0.5-50 kg), with a speed of 10-15 seconds per pick. Used for e-commerce, distribution warehouses, and centralized supermarkets. High accuracy, optimized for multi-item orders.
• Carousel ASRS: Rotating racks, compact storage (height 2-3m, saves 30-40% floor space). Average speed, lower cost than Unit Load. Used for small-to-medium scale warehouses, offices, and hospital pharmacies.
• Vertical Lift Module (VLM): Vertical cabinet system that automatically opens compartments and delivers items. Saves 70% floor space, speed of 6-8 seconds per pick. Used for narrow warehouses and electronic component manufacturing.

How does AS/RS work?

AS/RS operates according to the process: (1) An employee or an automated order sends a request to the WMS system, (2) The PLC calculates the item location and sends a command to the SRM robot, (3) The robot moves to the location, picks the item, and transports it to the delivery point, (4) The system updates inventory in real-time. The entire process requires no manual intervention.

1. Data Entry: Goods are scanned via barcode/RFID upon warehouse entry. The WMS records the location, quantity, and expiry date.
2. Storage Location Optimization: The AI system analyzes outbound frequency, arranging fast-moving items near the delivery point. Slow-moving items are placed on higher levels.
3. Automated Retrieval Command: When an order is placed, the WMS sends a command to the PLC. The SRM robot receives the command and moves horizontally and vertically to the location (speed 1-2 m/s).
4. Picking & Transport: The robot lifts/lowers pallets or boxes, placing them onto the conveyor. The conveyor transports them to the packing area.
5. Inventory Update: With each pick, the system records in real-time. Inventory reports are 99.8% accurate, automatically triggering replenishment orders when stock falls below the threshold.

Comparison Table: AS/RS vs. Traditional Manual Warehouse

Economic Benefits of Implementing AS/RS

Vietnamese factories applying AS/RS typically achieve 3-5 main benefits: (1) Reduce labor costs by 40-60%, (2) Increase order processing speed by 3-5 times, (3) Reduce errors from 3-5% to 0.2-0.5%, (4) Save warehouse space by 30-50%, (5) ROI within 3-5 years.

• Reduce labor costs: Replace 15-25 pickers with 2-3 supervising technicians. Save 300-600 million VND/year (salary, insurance, training).
• Increase productivity: Pick 1000-2000 times/day (vs. 300-500 times manually). Process 3-5 times more orders in the same time.
• Reduce errors: Accuracy of 99.5% (vs. 95-97% manual). Limit customer complaints and return costs for incorrect items.
• Optimize space: Racks 8-15m high instead of traditional 3-4m. Store 5-8 times more goods in the same area, reducing warehouse rental costs.
• Flexible expansion: Easily add racks and robots when output increases. ASRS can handle 10,000-50,000 picks/day depending on configuration.

Common Mistakes When Implementing AS/RS

1. Choosing the wrong type of AS/RS for the product: Some businesses buy Unit Load ASRS for small items, or Mini-Load for heavy pallets. This leads to slow speed and high operating costs. It is necessary to analyze the type of goods, weight, and frequency before investing.

2. Not integrating a suitable WMS: AS/RS operates at 80% efficiency if the WMS is not optimally configured. Professional warehouse management software (VietPOS Rack or equivalent) is needed for intelligent storage location calculation.

3. Over-investing for a small scale: Some small warehouses (500-1000 pallets) still purchase large-scale AS/RS. Maintenance costs are high, and ROI is extended to 7-10 years. It is better to start with a small-scale Carousel ASRS or Mini-Load.

4. Neglecting employee training: Technicians are not thoroughly trained, leading to downtime and system failures. Need to invest 3-6 months in training, with maintenance engineers available 24/7.

5. Not establishing a periodic maintenance plan: AS/RS requires monthly maintenance (checking robots, rails, sensors). If neglected, sudden breakdowns will occur, resulting in 1-3 days of lost production.

Application of AS/RS in Vietnamese Industries

Manufacturing, logistics, and retail industries in Vietnam are deploying AS/RS: (1) Electronic component manufacturing plants, (2) Logistics and consumer goods distribution warehouses, (3) Chemical raw material warehouses, (4) Pharmaceutical warehouses, (5) E-commerce sorting centers.

• Manufacturing Industry: Electronic component and automotive plants use Mini-Load ASRS to manage parts (high speed, high accuracy). Some factories in Bac Ninh and Hai Duong have successfully deployed it, reducing costs by 35-45%.
• Logistics & Distribution Warehouses: Large logistics centers (Hanoi, HCMC, Hai Phong) use Unit Load ASRS to handle tens of thousands of pallets per day. ROI is typically achieved within 3-4 years.
• Chemical & Raw Material Warehouses: ASRS helps manage hazardous goods, preventing errors that could cause fires or explosions. It offers high accuracy and automatic expiration date alerts.
• Pharmaceutical Warehouses: Major pharmaceutical distributors use Mini-Load ASRS, ensuring 99.8% accuracy and compliance with GMP standards.
• E-commerce Centers: Major e-commerce platforms (Shopee, Tiki, Lazada) are investing in ASRS to handle millions of orders per day, reducing delivery time from 3-5 days to 1-2 days.

Frequently Asked Questions about Automated AS/RS Warehouses

Is the maintenance cost of AS/RS high?

Yes, the annual maintenance cost is approximately 5-8% of the system’s value (for a 20 billion VND system, maintenance costs 1-1.6 billion VND/year). However, labor savings of 300-600 million VND/year still outweigh the maintenance costs. It is necessary to sign a maintenance contract with the supplier or train internal engineers.

Can AS/RS handle individual items?

Yes, but it depends on the type of ASRS. Mini-Load ASRS is specifically designed for small items (0.5-50 kg), with a speed of 10-15 seconds/cycle. Unit Load ASRS is for heavy pallets (500-2000 kg). If the warehouse has both pallets and individual items, a hybrid system (combining Unit Load + Mini-Load) is needed.

What is the ROI period for AS/RS?

Typically 3-5 years, depending on the system scale and usage frequency. A system handling 10,000 picks/day (saving 400-500 million VND/year) will have a faster ROI than a system handling 2,000 picks/day. Businesses with high labor costs (HCMC, Hanoi) often achieve ROI within 3-4 years.

Can AS/RS integrate with existing systems?

Yes, but a compatible WMS (API integration) is required. Viet Duc Tri Group provides the VietPOS Rack automated warehouse management solution supporting integration with AS/RS, ERP, and PLC control systems. The integration process typically takes 2-4 months, including configuration, testing, and training.

What is the minimum warehouse size for deploying AS/RS?

Unit Load ASRS requires at least 1,000-2,000 pallets/month for a reasonable ROI. Mini-Load ASRS can start from 5,000-10,000 picks/month. For smaller scales, consider Carousel ASRS or semi-automated shelving to reduce investment costs.

Are you considering deploying AS/RS for your factory or warehouse? Viet Duc Tri Group provides comprehensive automated warehouse solutions, from system design, AS/RS installation, WMS integration, to employee training. Contact us now at 0935 295 337 for a free consultation and cost estimate.