Safety Scanner Zone Configuration Basics
Content updated: September 5, 2026.
Warning/protective fields & teach-in. This section explains the key aspects of configuring safety scanner zones, with a focus on defining warning and protective fields, as well as the teach-in process to ensure optimal safety zone configuration for your industrial applications.
1) Defining Safety Zones
A safety scanner's main function is to monitor an area and protect workers from hazardous zones. Proper configuration of the safety zones is essential for maximizing protection and minimizing risks. This includes setting up the warning field and protective field.
- Warning Field: Normally supplies a non-safety alarm or operational slowdown request. It does not establish that the area is safe, and a normal slowdown cannot be credited as a safety-related speed reduction without a suitably designed and validated safety function.
- Protective Field: A configured detection area on a certified safety scanner. Detection commands the required safety response through the approved safety outputs; the field does not physically prevent entry. Its placement must allow the hazard to reach a safe condition before a person can reach it.
- Zone Distance: For stationary machinery, use the applicable ISO 13855 positioning method with complete stopping time, detection capability and approach geometry. For driverless trucks, use the ISO 3691-4 application requirements and scanner instructions, including loaded braking distance, control delay and tolerances. Nominal sensor range is not a field-sizing calculation.
2) The Teach-In Process
Teach-in records surrounding contours or proposes field boundaries, depending on the model. Keep the area in the manufacturer's prescribed state and review every proposed boundary. A wall, pallet or fixture captured during teach-in can hide an accessible route; learned geometry is not automatic acceptance of the safety function.
- Manual Teach-In: Enter or edit boundaries using the approved configuration tool after defining the required protective distance, mounting plane and detection capability. Check units, coordinate origin and excluded areas.
- Automated Teach-In: If the model supports it, use learned contours as a starting point. Do not let fixed objects or temporary obstructions reduce a required field. Independently inspect the proposed geometry before transferring it.
- Teach-In Validation: Use the manufacturer-specified test object and a controlled test procedure, without exposing a person to hazardous motion. Check the whole accessible field, blind spots, boundaries, every selected field set and the complete stopping/restart behavior.
3) Common Configuration Issues
Improper configuration of the safety scanner zones can lead to false triggers or missed detections, potentially compromising worker safety. Here are some common issues and how to avoid them:
- Incorrect Field Setup: Verify the protective distance and accessible approaches rather than simply tracing the machine outline. Check which field set is active, including startup, turning, reverse movement and invalid selection signals where applicable.
- Too Narrow a Detection Zone: Field width, mounting height and certified object-detection capability solve different problems. Check side access, crawling/stepping over and shadows behind fixed objects with the specified test object.
- Environmental Interference: Investigate dust, sunlight, reflections and nearby scanners within the exact model's operating limits. Do not cure false trips by shrinking a required field or increasing filtering without recalculating response and revalidating the function.
4) Configuration Acceptance Record
Record the evidence below before enabling production operation. A successful download or a clear diagnostic screen is not enough.
| Decision | Evidence to retain |
|---|---|
| Correct device and function | Exact model/order code, safety rating, approved manual and safety-output integration. |
| Field size and coverage | Stopping-time or braking-distance basis, mounting dimensions, required supplements, boundary and blind-spot test results. |
| Field selection | Every monitoring case, transition timing, safely established speed/direction where required, and response to invalid inputs. |
| Final release | Configuration version/checksum, approved settings, complete stop/restart tests and responsible acceptance record. |
For multiple field sets, continue to protective-field switching and transition validation. For vehicle-specific distances and integration, use the ISO 3691-4 AGV/AMR guide.
Frequently Asked Questions
What are warning and protective fields in safety scanners?
A warning field normally provides non-safety information for an alarm or operational slowing. A certified protective field commands the validated safety response through safety-rated outputs. A clear warning field or ordinary slowdown cannot replace that protective function.
What is the teach-in process for safety scanners?
Teach-in proposes or records field geometry from the surroundings. It does not calculate a safe distance or validate safeguarding. A qualified person must review the geometry, response and switching settings, then test detection and the complete safety response before release.
What common issues occur during safety scanner configuration?
Common issues include undersized fields, untested blind spots, unsuitable detection capability, incorrect monitoring-case selection and environmental interference. Do not hide these problems by shrinking fields or extending filters without recalculation and validation.
Standards and Model Instructions
Use IEC 61496-3:2025 for AOPDDR equipment requirements, IEC 62046:2026 for protective-equipment application, ISO 13855:2024 for safeguard positioning, and ISO 3691-4:2023 for driverless industrial trucks. Apply the edition required for the project together with the exact scanner manual; this introductory guide is not a commissioning sign-off.