AMR Protective-Field Engineering From Measured Stops to Safe Field Sets
Engineering conclusion: A protective field should be released only when the configured field reaches beyond the complete measured stopping envelope for the active speed, direction, load, floor and operating state. Scanner range, nominal deceleration and one successful stop do not establish that result.
Scope: This guide addresses field engineering for industrial autonomous mobile robots and automated guided vehicles using safety-related electro-sensitive protective equipment. It concentrates on horizontal mobile protection during travel. Vertical guarding, manipulator hazards, elevated loads and application-specific access protection require their own analysis.
Required output: The engineering record should connect a timing ledger, vehicle and load contour, measured braking data, field geometry, field-set selection logic, test cases, uncertainty, approved configuration and revalidation triggers. The result is a controlled stop-and-field envelope, not a drawing copied from a scanner configurator.
A Protective Field Is a Motion Budget, Not a Scanner Range
A safety laser scanner may advertise a maximum protective-field range, angular coverage, resolution, response time and number of field sets. Those values describe device capability. They do not tell an integrator how far the active field must extend on a particular robot. The required reach emerges from the complete application: how fast the robot is moving, how long the safety chain takes to react, how far the configured vehicle travels while braking, how the load changes the leading contour, how people can approach, and how much uncertainty remains in measurement and field realization.
This distinction prevents a recurring procurement error. A longer-range scanner is not automatically a safer selection, and a field that fits inside a narrow aisle is not automatically adequate. The field must first cover the validated stop-and-approach budget. Only then can the team determine whether the robot can operate at the desired speed in the available space.
The existing guide to safety laser scanner selection for AGVs and AMRs explains scanner types, coverage and selection factors. This article performs a different engineering task: it converts measured response and braking behavior into a direction-specific safety laser scanner protective field and a testable field-set architecture.
Begin at the Hazardous Contour, Not at the Scanner Origin
Field drawings are often created in scanner coordinates, but people are exposed to the physical robot, its load and its moving attachments. The first step is therefore to define the hazardous moving contour for every authorized configuration. That contour may be wider or longer than the chassis and can change during lifting, fork extension, conveyor transfer, towing or steering.
A useful field model contains at least five reference geometries:
| Reference geometry | Engineering question | Evidence |
|---|---|---|
| Scanner measurement origin | Where does the configured field begin, and what device tolerances apply? | Installation drawing, manufacturer instructions and configuration export |
| Vehicle contour | Which chassis, wheel, fork, bumper or steering element can reach a person? | Controlled envelope drawing and physical measurement |
| Load and top-module contour | Does the pallet, rack, conveyor, lift or fixture overhang or change position? | Approved load-class drawings and state information |
| Swept path | What space is occupied during straight travel, turning, pivoting, reversing and lateral motion? | Kinematic envelope, simulation and route measurement |
| Detection and approach geometry | From which direction can a person or object enter, and which detection plane can see it? | Risk assessment, site survey and detection tests |
Suppose a scanner is mounted 350 mm behind the front edge of a mobile base. If a loaded pallet projects another 180 mm forward, a field measured from the scanner origin must cover that 530 mm offset before it provides any stopping clearance ahead of the load. Ignoring the offset can produce a field that appears long in software but provides very little free distance beyond the real leading edge.
Width matters as much as length. During a turn, the outside front corner, load edge or steering wheel may sweep beyond the straight-travel contour. A differential-drive robot rotating in place, an Ackermann-steered vehicle following an arc and an omnidirectional robot translating sideways create different envelopes. One symmetrical field copied to every motion state is rarely an adequate engineering argument.
Build a Time Ledger Before Writing a Distance Formula
The robot continues moving after an object first becomes detectable. The total delay is distributed across sensing, configured evaluation, field selection, safety logic, drive reaction and brake-force development. A useful mobile robot stopping time record separates those contributions instead of hiding them behind one undocumented number.
| Time element | What it represents | Common source of error |
|---|---|---|
| Sensor response | Time from valid field intrusion to the scanner's safety output response | Using only a basic device value while ignoring the configured sampling or evaluation mode |
| Field-set or case transition | Time and state logic required to make the correct field active | Assuming a new speed and new field become valid simultaneously |
| Safety-control response | Input processing, safety logic and output actuation | Using a standard PLC scan time for a separate safety path |
| Communication contribution | Validated delay in any safety-related communication used by the function | Crediting a fleet or Wi-Fi command that is not part of the safety-related architecture |
| Drive reaction | Delay between the stop command and measurable torque reduction or braking action | Defining brake onset from software command time rather than physical response |
| Brake build-up | Time for deceleration to reach its effective profile | Modeling braking as an instantaneous constant deceleration |
| Mechanical stopping phase | Travel from effective braking through zero speed and any permitted settling | Stopping the clock at commanded zero rather than verified standstill |
Each value needs a source and configuration. A manufacturer manual may support the scanner component under stated settings. A safety-controller calculation may support logic response. The drive and mechanical phases normally require configured-system data. If software versions, multiple sampling, safety-network topology or brake parameters change, the ledger may change even when the scanner hardware remains the same.
Keep Fleet Coordination Outside the Immediate Protective Response
A fleet manager can prevent route conflicts, reserve intersections and assign lower speeds. It should not be assumed to perform the immediate local stop unless the claimed function and communication path are explicitly safety-related and validated. The site's guide to AMR fleet traffic management distinguishes local safety from route coordination. Protective-field engineering should preserve the same boundary: loss of Wi-Fi or a stale fleet command must not leave the vehicle moving with an undersized local field.
Convert Timing and Brake Evidence into a Stop Envelope
A transparent AMR protective field calculation can be organized as an engineering decomposition rather than a universal compliance formula. The following notation is deliberately generic because applicable standards and manufacturer instructions can require additional terms or different treatment.
t_pre = t_sensor + t_field + t_control + t_communication + t_drive
d_pre = v_0 × t_pre
d_motion = d_pre + d_brake
L_field ≥ o_lead + d_motion + d_approach + d_geometry + d_uncertainty
Here, v_0 is the highest verified speed at field intrusion for the active state. o_lead is the distance from the scanner origin to the leading hazardous contour. d_brake is the validated braking travel from the defined physical onset of braking to the required stopped state. d_approach represents any applicable allowance for a person's or object's approach. d_geometry covers relevant contour, detection-plane and swept-path effects. d_uncertainty covers justified measurement, repeatability and implementation allowances without concealing them in a vague safety factor.
A constant-deceleration expression such as v_0²/(2a) can be useful for early screening, sensitivity analysis or test planning. It should not replace measured braking evidence when brake build-up, jerk limits, slope, control saturation, wheel slip, load motion and speed-estimation error influence the actual stop. The most important AMR stopping distance is the traceable distance produced by the configured system under the demanding authorized conditions, not a catalog value or an ideal equation.
Distance Is Directional
The symbols above produce a one-dimensional view. A real vehicle needs a two-dimensional or three-dimensional stopping envelope. Longitudinal travel during braking, lateral deviation, yaw, load swing, steering sweep and contour expansion may occur at the same time. The field must protect the space into which the hazardous contour can move, not merely extend a centerline by one distance.
A Worked Engineering Pre-Check
Illustrative only: The following values demonstrate traceable arithmetic. They are not recommended settings, standard values or evidence for a real application.
Consider a configured AMR traveling at 1.20 m/s. The scanner origin is 0.38 m behind the leading loaded contour. The project timing ledger contains the following maximum validated or specified contributions for the selected configuration:
| Input | Illustrative value | Evidence status |
|---|---|---|
| Speed at intrusion | 1.20 m/s | To be verified from synchronized motion data |
| Configured scanner and field evaluation | 0.080 s | Device-specific source required |
| Safety-control and output response | 0.020 s | Architecture calculation and test required |
| Drive reaction and brake build-up allowance | 0.100 s | Configured-system measurement required |
| Measured braking travel after defined onset | 0.620 m | Worst supported test result, not an average |
| Geometry and uncertainty allowance | 0.180 m | Itemized project justification required |
The pre-braking time is:
t_pre = 0.080 + 0.020 + 0.100 = 0.200 s
The travel during that delay is:
d_pre = 1.20 × 0.200 = 0.240 m
The scanner-origin reach before any applicable approach supplement is:
L_base = 0.380 + 0.240 + 0.620 + 0.180 = 1.420 m
The engineering result is not “set the field to 1.42 m.” It is:
L_field ≥ 1.420 m + d_approach + any additional requirement from the applicable standard, risk assessment and manufacturer instructions
The calculation must also be repeated or transformed for reverse travel, curves, lateral motion and different load contours. If the project later increases speed to 1.50 m/s, it cannot scale the field by a simple percentage. Delay travel grows with speed, while braking travel may change nonlinearly and must be re-established.
Treat Braking Results as a Distribution, Not One Number
An AMR braking distance test should characterize repeatability and identify the condition that produces the largest relevant stop envelope. A test report containing one unloaded stop on clean, level concrete provides little support for a loaded production route.
The validation matrix should vary the factors that can materially change stopping behavior:
| Factor | Representative states | Why it matters |
|---|---|---|
| Vehicle configuration | Empty, nominal load, maximum approved load and demanding CG class | Changes brake energy, tire loading, control limits and leading contour |
| Speed | Every safety-relevant speed band and transition boundary | Changes delay travel, braking energy and field selection |
| Direction and motion | Forward, reverse, curve, pivot and lateral translation where permitted | Changes braking distribution, sweep and scanner coverage |
| Floor | Validated low-friction surface, joints, slope and relevant contamination state | Changes traction, yaw and stopping repeatability |
| Equipment state | Wheel wear limits, brake temperature, battery range and maintenance boundary | Exposes lifecycle drift hidden by new-equipment testing |
| Control state | Normal protective response, relevant fault response and degraded mode | Confirms the actual safety path and fallback behavior |
For each run, record the speed at intrusion, safety-output transition, brake command, measurable deceleration onset, speed trace, longitudinal travel, lateral deviation, yaw, final contour position and load movement. Synchronize the data sources. A timestamp from the scanner, a drive log and a video file are not directly comparable if their clocks have unknown offsets.
Do not use the arithmetic mean as the protective limit. Report all trials, the maximum observed result, measurement uncertainty, anomalies and the rationale for the design allowance. A statistical model may support an engineering decision when its population, confidence and assumptions are justified, but a convenient percentile should not silently replace the required safety boundary.
Shape the Field Around the Swept Stop Envelope
Good AGV protective field design is geometric. It starts with the set of positions that the hazardous contour can occupy between detection and standstill, then surrounds that set with the required detection and uncertainty provisions. This is why a rectangular field drawn ahead of a circular scanner is often an oversimplification.
Forward and Reverse Travel
Forward and reverse may use different scanners, braking characteristics, offsets and maximum speeds. A rear field cannot be validated by mirroring the front field unless the vehicle, load, sensor placement and stop data are genuinely symmetrical. Towed carts and rear overhangs make the difference especially important.
Turning and Curve Entry
During a turn, the field should cover the outside sweep and the stopping path of the active contour. A speed-dependent field may need direction or steering information as well as translational speed. If steering angle, yaw command or direction state is unavailable or implausible, the system needs a defined fallback field and safe response.
Omnidirectional and Lateral Motion
An omnidirectional platform can create hazardous motion on any side without first rotating its body. Field coverage and selection must follow the permitted motion vector. Four static side fields may still leave gaps at diagonal transitions if overlap and switching are not verified.
Loads That Change the Contour
Pallet overhang, fork extension, raised lift position, conveyor transfer and load shift can all change the hazardous contour. The control system should know which load state is active or default to the most restrictive validated state. A fleet task label is not sufficient evidence that the physical load matches the expected contour.
Dynamic Fields Need a Safe State Machine
Dynamic protective fields for AMRs can preserve throughput by matching field reach and shape to verified speed, direction and configuration. Their benefit depends on correct selection. A small low-speed field combined with a high-speed motion command creates precisely the condition field switching is meant to prevent.
The field-set state machine should define:
- which speed, direction, steering and load states authorize each field;
- which safety-related inputs establish those states;
- how input plausibility and disagreement are handled;
- how long field activation and confirmation take;
- the order of operations during acceleration and deceleration;
- the field used during startup, communication loss or unknown state;
- how configuration identity is checked at power-up and after service;
- which logs demonstrate the active field during a test or incident.
Safe sequencing is asymmetric. Before acceleration, the larger field required for the higher speed should be active and confirmed before that speed becomes possible. During deceleration, the system should not select a smaller field until the lower speed has been achieved and safely established. The response and transition delays belong in the timing ledger.
AMR safety field switching also needs invalid-state behavior. If speed inputs disagree, direction is unknown, the selected field identifier does not match the approved configuration, or a safety-related encoder fails, the system should enter the specified conservative field or safe motion state. It should not guess which field is probably correct.
| Illustrative field state | Permitted condition | Required transition logic |
|---|---|---|
| Standstill or recovery field | Verified standstill and authorized recovery state | Motion remains inhibited until the next required field is active |
| Low-speed forward field | Forward direction and speed within the validated low band | Must be replaced by the larger field before acceleration beyond the band |
| High-speed forward field | Forward motion within the validated high band | Field active and confirmed before high speed is enabled |
| Turning field | Verified steering or motion state within the approved turn envelope | Covers outside sweep and transition overlap |
| Fallback field | Unknown, conflicting or failed state input | Supports the defined safe response without relying on normal navigation |
Warning Fields and Protective Fields Have Different Jobs
A warning field can support smooth operation by initiating a warning, a controlled reduction in speed or a navigation response before the protective field is reached. It should not be treated as the protective boundary unless the complete claimed function is safety-related and validated.
For example, a navigation system may detect a person in a larger perception zone and replan around them. That can reduce unnecessary stops. The protective field remains responsible for the defined safety response if the person continues toward the hazardous contour or if replanning is unavailable. The site article on dynamic obstacle avoidance explains the performance layer. Protective-field evidence should never depend on a non-safety-rated costmap simply because it usually reacts first.
A staged slowdown can reduce the final stopping distance, but its credit must be explicit. If intrusion into an outer field is intended to produce a safety-related speed reduction, the speed transition, monitored limit, response time, inner-field selection and fault behavior all become parts of the claimed safety function.
Installation Geometry Can Defeat a Correct Distance
A field may have adequate calculated length and still miss the hazardous object. Detection depends on mounting height, scan-plane orientation, resolution, target characteristics, floor profile, occlusion and the relationship between the scanner and moving contour.
Low objects can pass below a scan plane. Overhanging loads or fork structures can block part of the view. A scanner recessed inside the chassis can create shadow regions at corners. Floor ramps or pitch motion can cause the scan plane to intersect the floor or rise above a target. Transparent, highly reflective, very dark or geometrically difficult objects can challenge different sensor technologies. Contamination can reduce availability or alter detection behavior.
The guide to mobile robot sensor selection explains why object class and environment matter. For the protective function, the team must use devices within their intended safety-related application and validate the installed detection geometry with defined test pieces and site conditions. Adding a navigation camera does not automatically close a safety-rated coverage gap.
Validation Must Map Every Field to Every Authorized State
AMR protective field validation should prove three connected claims: the correct field becomes active, the field detects the defined intrusion in the installed geometry, and the configured robot remains within the accepted stop envelope. Testing only the scanner output or only the vehicle stop leaves the chain incomplete.
| Test family | Test question | Minimum retained evidence |
|---|---|---|
| Configuration identity | Are the approved scanner, field file, safety logic, drive parameters, load class and software versions active? | Signed baseline and configuration export |
| Field geometry | Does the installed field detect at its boundaries, corners, overlaps and relevant scan-plane locations? | Point map, test-object record, photos and results |
| Field selection | Is the correct field active for each speed, direction, turn, load and degraded state? | State trace, field identifier, input signals and expected transition |
| Response timing | Does the measured safety chain remain within the approved timing ledger? | Synchronized sensor, controller and drive traces |
| Stopping envelope | Does the complete hazardous contour remain inside the accepted longitudinal and lateral boundary? | Distance data, trajectory, video, load position and uncertainty |
| Fault response | What happens when a state input, device, communication path or configuration check fails? | Fault-injection result and recovery record |
| Site interaction | Do real aisles, crossings, slopes, doors, stations and floor conditions preserve the validated assumptions? | SAT route matrix and approved deviations |
Instrument the event at a suitable resolution. Useful tools can include calibrated speed and distance measurement, high-frame-rate video, synchronized safety I/O capture, drive logs, field-set status, steering angle, yaw rate and physical markers for intrusion and final contour. The method should define reference points so that two test teams do not measure from different parts of the robot.
Factory acceptance testing can characterize the product and configured system in controlled conditions. Site acceptance testing must address the installed floor, slopes, traffic interfaces, loads, routes and field constraints. The existing AMR deployment validation guide provides the broader FAT, SAT and production-release framework.
Narrow Aisles Turn Field Engineering into a Capacity Decision
If the required field does not fit the operating space, shrinking the field is not an engineering solution. The project must change one or more governing conditions: reduce and safely monitor speed, shorten the validated response chain, improve braking within stability limits, redesign the load contour, change the route, separate people, control access, alter traffic direction or select a different system architecture.
This creates a direct relationship between safety evidence and throughput. A vehicle may have a catalog maximum speed of 2.0 m/s but be unable to use it in an aisle where the corresponding field would repeatedly intersect racks, walls or normal traffic. A slower robot that moves continuously can outperform a faster robot that triggers frequent stops. Field intrusion rate, speed-band occupancy, protective stops, restart delay and route capacity should therefore be reviewed together.
Do not defeat nuisance stops by trimming field corners without analysis. Repeated intrusions may reveal poor scanner placement, an unmodeled sweep, excessive speed, a route too close to fixed objects or people routinely entering the required space. The corrective action should address the mechanism.
Faults and Degraded States Need Their Own Fields
Normal field selection assumes that the system knows speed, direction, steering, load state and configuration. Safety engineering must define what happens when one of those facts is missing or contradictory.
Relevant cases include invalid encoder signals, field-set input disagreement, scanner contamination, blocked optics, configuration checksum mismatch, safety-controller fault, brake-performance drift, localization uncertainty, unconfirmed load position, steering-state mismatch and loss of a safety-related communication link. Each case requires a specified detection method, safe response, operator indication, reset authority and return-to-service test.
Navigation uncertainty deserves careful separation. A mobile robot can lose map confidence while its onboard protective field remains available. The immediate safe response should be defined by the safety requirements rather than improvised by the planner. Conversely, a healthy navigation estimate does not justify continued motion when the protective function is unavailable.
Control Changes That Can Invalidate the Field
A protective field is valid only for its approved baseline. Changes that appear operational can alter the stop-and-field relationship. Formal impact analysis should review at least:
- maximum speed, acceleration, deceleration or jerk parameters;
- scanner model, firmware, response setting, multiple sampling or mounting;
- safety-controller logic, network topology or field-selection input;
- drive firmware, brake configuration or safe motion function;
- wheel material, diameter, wear limit or tire supplier;
- payload mass, CG, overhang, top module, fork or lift state;
- route direction, curve, slope, floor coating, joint or contamination exposure;
- new aisle constraints, workstations, pedestrian crossings or forklift interactions;
- field-file edits, map-zone changes or fleet speed-policy changes.
The change record should identify affected requirements, field sets, calculations and tests. A field file should be version-controlled with the same discipline as safety logic. Editing a polygon in a commissioning laptop is a safety-related configuration change, not routine graphical tuning.
What Current Standards Establish—and What They Do Not
ISO 3691-4 AMR safety is a useful search entry, but the engineering team must review the actual scope and current edition. ISO lists ISO 3691-4:2023 as the published edition for driverless industrial trucks and their systems, including AGVs and AMRs among its examples. ISO also lists a successor draft under development. The public scope establishes the product and system context; it does not allow a blog to declare a project compliant.
ISO 13855:2024 addresses positioning and dimensioning of safeguards with respect to human approach. Its applicability and required terms should be assessed for the actual safeguarding function. ISO 13849-1:2023 provides a methodology for safety-related control systems but does not assign a universal required performance level to every AMR field function. IEC 61496-1:2020 addresses general requirements for electro-sensitive protective equipment designed to detect persons as part of a safety-related system. IEC 61496-3:2025 provides particular device requirements for active opto-electronic protective devices responsive to diffuse reflection. Its public abstract also makes an important boundary explicit: the device standard does not specify the dimensions or configuration of the detection zone for a particular application.
For the United States, ANSI/A3 R15.08 separates product, system integration and user responsibilities across its series. A3 states that Part 2 addresses integration, configuration and customization of an industrial mobile robot or fleet into a site. Part 3, published in 2026, emphasizes risk assessment, management of change and lifecycle safety for users.
The practical boundary is clear: standards establish requirements and methods, manufacturers define device and product limits, integrators engineer the installed application, and users maintain the current operating environment. None of those responsibilities can be replaced by a generic field length from an online article.
The Production Evidence Pack
A production release should make the reasoning reproducible. The evidence index should contain:
- the applicable risk assessment and linked safety requirements;
- the approved robot, load, top-module and operating-zone baseline;
- scanner installation drawings and controlled field configuration files;
- the response-time ledger with sources, settings and worst-case treatment;
- raw stopping-test data for every approved motion and load class;
- the stop-envelope calculation with geometry and uncertainty terms visible;
- field-set state diagrams, safety-related inputs and transition timing;
- boundary, overlap, fault-injection, FAT and SAT test results;
- deviations, corrective actions, reviewers and release approval;
- inspection intervals, wear limits and change-triggered revalidation rules.
The preceding article on AMR safety requirements specification explains how to link hazards to requirement IDs and validation evidence. This article supplies the specialized stop-and-field records that should sit beneath those requirements.
Focused FAQ
Is the scanner's maximum range the required protective-field length?
No. Maximum range is a device capability. Required field reach depends on scanner position, hazardous contour, speed, complete response time, measured braking, approach assumptions, geometry, uncertainty and applicable requirements.
Can stopping distance be calculated from speed and nominal deceleration?
A kinematic calculation can support early screening, but final engineering should use validated behavior of the configured robot. Brake build-up, control delay, slope, wheel-floor interaction, load state, wear and lateral movement can make the real stop different from an ideal constant-deceleration model.
Should the maximum or average measured stop be used?
The average alone is not an adequate boundary. Retain every trial, identify the largest relevant result, account for measurement uncertainty and variation, investigate anomalies, and apply the acceptance method established by the applicable requirements and qualified project team.
Why must field switching occur before acceleration?
The field required for the higher speed must be active before the robot can enter that speed state. Otherwise the robot can temporarily travel fast while protected by a shorter low-speed field. Deceleration follows the reverse logic: the smaller field should not become active until the lower speed is safely established.
Can a navigation obstacle-avoidance zone replace a protective field?
Not automatically. Navigation perception and path planning improve performance, but they should only receive safety credit when the complete function, device architecture, integrity, diagnostics, limits and validation support the claim.
Does a loaded AMR always need a larger field?
Not as a universal rule, but load can change braking travel, contour, CG, tire loading, stability and the permitted deceleration profile. Each approved load class should be connected to validated stopping data and field selection. A large overhang can increase required scanner-origin reach even if braking behavior is unchanged.
How many field sets should an AMR use?
There is no universal number. The architecture needs enough field states to cover the validated combinations of speed, direction, turn and configuration without creating unmanageable transition complexity. Every field and transition must be traceable and testable.
What should happen if the field-state inputs disagree?
The system should enter the defined conservative field or safe motion state, indicate the fault, prevent unauthorized restart and require the specified recovery evidence. It should not continue by selecting the most convenient input.
When must protective fields be revalidated?
Revalidation is required when a change can affect response timing, braking, contour, detection geometry, field selection or operating-zone assumptions. Examples include speed changes, new loads, different wheels, brake updates, scanner replacement, field-file edits, floor resurfacing and route reversal.
Conclusion: Release a Verified Envelope, Not a Polygon
A protective-field polygon is the final visible output of a much larger engineering argument. That argument begins with the hazardous contour and authorized motion, separates every response-time contribution, measures braking across demanding configurations, accounts for approach and uncertainty, shapes the field around the swept stop envelope, and verifies that the correct field is active before the corresponding motion is permitted.
This approach also exposes feasibility early. If the validated field cannot fit in the aisle, the project must change speed, response, braking, route, separation or architecture. It must not make the evidence fit by making the polygon smaller.
The strongest AMR deployments can answer a simple audit question: for this robot, load, speed, direction, floor and field identifier, which measurements prove that the complete hazardous contour stops inside the protected boundary? When the answer is traceable to controlled data and remains valid after change, protective fields become engineering evidence rather than colored shapes on a configuration screen.
Authoritative Reference Entrances
- ISO 3691-4:2023 — Driverless industrial trucks and their systems
- ISO 13855:2024 — Positioning and dimensioning of safeguards
- ISO 13849-1:2023 — Safety-related parts of control systems
- IEC 61496-1:2020 — General requirements for electro-sensitive protective equipment
- IEC 61496-3:2025 — Particular requirements for AOPDDR protective devices
- ANSI/A3 R15.08-2 official introduction
- ANSI/A3 R15.08-3-2026 official product page
- SICK technical explanation of mobile protective-field sizing
Editorial boundary: This guide provides an original engineering framework and illustrative arithmetic. It does not reproduce paid standards, assign a required performance level, specify a universal field allowance, replace manufacturer instructions or approve an actual mobile robot application. Project-specific risk assessment, competent safety engineering and documented validation remain necessary.
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