Safety sensors are the first line of defense between an AGV and warehouse personnel. When evaluating a Chinese AGV supplier, buyers should look beyond marketing materials and focus on the actual functional safety architecture used on the vehicle.

A complete safety review should cover:

• Safety laser scanners

• Safety PLC systems

• Emergency stop circuitry

• Safety bumpers

• Risk assessment documentation

• Functional safety validation records

Understanding these elements before purchase can help reduce operational risks and simplify compliance reviews later.

Which Safety Laser Scanners Are Commonly Used on Chinese AGVs?

Many export-oriented AGV manufacturers integrate internationally recognized safety components from established suppliers.

Common brands include:

• SICK

• Pepperl+Fuchs

• Keyence

• Omron

• Leuze

When reviewing a supplier, request:

Safety Component Information

• Scanner manufacturer

• Scanner model number

• Product datasheets

• Safety certification documents

• Electrical integration drawings

The scanner model should appear on the official Bill of Materials (BOM), not just in sales presentations.

Understanding AGV Safety Detection Ranges

The actual detection range depends on:

• Scanner specifications

• Vehicle speed

• Load weight

• Warehouse environment

• Safety field configuration

Typical safety field settings include:

Dynamic Safety Field Adjustment

Modern AGVs often adjust safety zones automatically.

When stationary:

• Smaller protection area

• Reduced operating footprint

When moving at higher speed:

• Larger safety field

• Earlier obstacle detection

• Increased stopping distance allowance

Always request actual safety field drawings rather than relying on generic specifications.

Category 3 vs Category 4 Safety Systems

Many AGV buyers encounter terms such as Category 3 and Category 4 but are unsure of the differences.

Category 3 Safety Architecture

Commonly used for:

• Autonomous pallet trucks

• Stacker AGVs

• Standard warehouse AGVs

Features include:

• Redundant safety channels

• Continuous fault monitoring

• Reliable protection for most warehouse applications

Category 4 Safety Architecture

Typically used for:

• High-speed AGVs

• Heavy-load vehicles

• Automotive manufacturing environments

• High-risk industrial facilities

Provides:

• Higher fault tolerance

• Enhanced diagnostic coverage

• Greater protection against safety system failures

Questions to Ask Suppliers

Before purchase, request confirmation of:

• Safety category level

• Achieved Performance Level (PL)

• Safety PLC model

• Risk assessment documentation

Avoid accepting claims without supporting technical evidence.

How AGVs Handle Blind Spots and Human Detection

A properly engineered AGV should never depend on a single front-facing scanner.

Modern systems typically use multiple protection layers.

Multi-Directional Protection

Typical configuration includes:

• Front safety scanner

• Rear safety scanner

• Side protection fields

• Corner monitoring zones

Warning Zone Response

When a person enters a warning zone, the AGV may:

• Reduce speed

• Activate audible alarms

• Trigger visual warning indicators

Protection Zone Response

When a person enters the safety protection zone, the AGV should:

• Execute a safety stop

• Disable drive motion

• Require a controlled restart procedure

Understanding AGV Stopping Distance

One common misconception is that AGVs can stop instantly.

Actual stopping distance depends on:

• Vehicle speed

• Payload weight

• Floor surface conditions

• Brake performance

• Safety scanner configuration

For this reason, safety field settings must be calculated based on real operating conditions rather than theoretical values.

Ask suppliers for documented stopping-distance calculations at maximum operating speed.

How to Verify Safety Bumper Performance

Safety bumpers act as secondary protection if an object reaches the vehicle before the laser scanner stops it.

Recommended FAT and SAT Tests

Visual Inspection

Check:

• Physical condition

• Mounting integrity

• Cable protection

• Damage indicators

Manual Activation Test

Apply controlled pressure to the bumper and verify:

• Motion stops immediately

• Safety alarms activate

• Fault events are recorded

Restart Verification

After activation:

• Remove obstruction

• Reset safety circuit

• Confirm restart follows approved procedures

Safety Documentation Every Buyer Should Request

Professional AGV suppliers should be able to provide a complete safety package.

Recommended Documentation

Functional Safety Documents

• Risk Assessment Report

• Safety Circuit Diagram

• Safety PLC Documentation

• Emergency Stop Architecture

Safety Certifications

• Laser Scanner Certificates

• Safety Component Certifications

• Functional Safety Validation Reports

Testing Records

• Factory Acceptance Test (FAT) Reports

• Safety Verification Records

• Stopping Distance Validation Reports

Warning Signs During Supplier Evaluation

Consider additional due diligence if a supplier:

❌ Cannot identify the safety scanner manufacturer

❌ Refuses to provide safety documentation

❌ Cannot explain stopping-distance calculations

❌ Has no documented risk assessment process

❌ Uses non-certified industrial sensors in safety applications

These are often indicators of an immature safety engineering process.

Questions to Include in Your AGV RFQ

Before placing an order, ask suppliers:

Safety Components

• What laser scanner brand and model is installed?

• What safety PLC is used?

• Which safety certifications are available?

Safety Performance

• What is the maximum detection range?

• What Performance Level (PL) is achieved?

• What is the validated stopping distance?

Safety Validation

• Can safety field maps be provided?

• How are blind spots protected?

• How is bumper functionality tested during FAT?

Final Recommendation

When comparing Chinese AGV suppliers, focus on documented safety performance rather than marketing claims.

A qualified supplier should be able to demonstrate:

✔ Certified safety laser scanners

✔ Formal risk assessment reports

✔ Category 3 or Category 4 safety architecture

✔ Documented stopping-distance calculations

✔ FAT and SAT safety validation procedures

✔ Complete functional safety documentation

The safest AGV is not necessarily the one with the most sensors—it is the one with a properly engineered, validated, and documented safety system that matches your warehouse environment, vehicle speed, and operational requirements.