Understand the access demand
Determine who enters, why, how often and whether access is required during specific operating modes.
Machine guarding solution
Interlocked Doors & Controlled Access
Safety switches, guard locking, trapped-key systems and access stations engineered into doors, gates and panels.
Direct answerWhat it is and where it fits
An interlocked guard monitors whether a door, gate or panel is closed and uses that status within the machine safety control system. Guard locking can keep the guard locked until hazardous movement or process conditions have reached a safe state.
Where it fits
Typical applications
A project-specific assessment confirms the final design, but interlocked doors & controlled access is commonly used for:
- 01Frequent operator access
- 02Long stopping-time machinery
- 03Robot and automation cells
- 04Process areas with retained energy
- 05Maintenance access gates
- 06Multi-door perimeter systems
Configuration
Designed around the environment and access task.
The physical form is selected after the hazard, safe distance, containment, hygiene and maintenance needs are understood.
Coded non-contact switches
Tongue-operated interlocks
Guard-locking switches
Trapped-key exchange systems
Request-to-enter and reset stations
Door alignment and anti-defeat features
Engineering method
How we develop the solution.
Determine stopping and escape needs
Assess stopping time, run-down, retained energy, whole-body access and emergency release.
Select suitable technology
Choose the interlock type, coding, locking principle and diagnostic capability for the risk and environment.
Validate the safety function
Test opening, locking, fault response, reset, restart prevention and any escape-release function.
Project scope
Typical deliverables
Deliverables are confirmed in the quotation so responsibilities and interfaces remain clear.
Request a project review- Access-function definition
- Switch and actuator selection
- Mechanical mounting design
- Wiring and control interface
- Installation
- Functional testing
- Device schedule and test record
Technical questions
Interlocked Doors & Controlled Access FAQs
Answers are general; the machine-specific assessment controls the final design.
When is guard locking needed?
Guard locking is commonly considered where a person could reach the hazard before dangerous movement or process conditions have stopped, or where process control requires access to remain restricted.
Can a standard door switch be used as a safety interlock?
Only devices and architectures suitable for the required safety function should be used. Selection includes device type, fault detection, coding, mounting and the performance required by the risk assessment.
Why does interlock alignment matter?
Poor alignment can cause nuisance trips, mechanical damage or deliberate defeat. Rigid mounting, suitable tolerances and door control are essential to reliable operation.
