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Dual Door Linkage Circuit Diagram Examples

Dual door linkage circuits are essential for coordinating two doors in access control, cleanroom interlocks, and safety-critical environments. These circuit diagrams illustrate common approaches—relay logic, optical isolation, RS-485 communication, and motor control—giving you a head start on your design. Each example can be opened, edited, or remixed directly in our online editor.

Standard IEEE Std 315 / ANSI Y32.2Engine schematex-circuitExport SVG · PNG · PDF
4 templates
Circuit diagram Dual Door Linkage
Dual Door Interlock Relay LogicDual Door Interlock Relay LogicDual Door LinkageUse template →Fail-Safe Dual Door Motor ControlFail-Safe Dual Door Motor ControlDual Door LinkageUse template →Dual Door Linkage with RS-485 CommunicationDual Door Linkage with RS-485 CommunicationDual Door LinkageUse template →Optically Isolated Dual Door LinkageOptically Isolated Dual Door LinkageDual Door LinkageUse template →

Nothing close enough? Start from a blank circuit diagram → Describe it in one paragraph.

How to

How to use a circuit diagram template.

  1. 01Define the interlock requirements

    Specify door sequence, timeout, fail-safe vs. fail-secure, and any emergency override needs.

  2. 02Choose control components

    Select relays, sensors, controllers, or communication modules suitable for your electrical and safety standards.

  3. 03Generate or sketch the circuit

    Use our circuit diagram tool to create wiring schematics—place symbols, connect pins, or let AI build it from a description.

  4. 04Verify logic and safety

    Simulate the sequence, check for conflicts, and ensure the circuit meets relevant norms like ISO 13849 or IEC 62061.

  5. 05Export and document

    Download the diagram as PDF, PNG, or editable format, and include it in your technical documentation.

FAQ

Questions about circuit diagram templates

What is a dual door linkage circuit?

A dual door linkage circuit electronically interconnects two doors so that one cannot open until the other is closed and locked, commonly used in airlocks, cleanrooms, and high-security access points.

How does a door interlock relay logic circuit work?

Relay logic uses hardwired contacts and coils to enforce the open/close sequence. For example, a pair of relays can be cross-wired so that energizing one door's lock de-energizes the other, preventing simultaneous opening.

What's the difference between fail-safe and fail-secure in dual door circuits?

Fail-safe unlocks doors on power loss (ensuring egress), while fail-secure remains locked (protecting assets). Your circuit must match the life safety requirements of the building.

Can I add optical isolation to a dual door linkage?

Yes, optical isolators (optocouplers) are often used to protect sensitive microcontrollers from high-voltage door hardware, as shown in several of our example circuits.

How do I create a dual door linkage circuit diagram without drawing from scratch?

Select one of our example templates, then customize it with our AI editor. You can also generate a new diagram by describing your door system in plain language.