Monitored Electric Locks: Bolt, Door and Bond Status NZ

A controller output marked locked does not necessarily mean the physical door is secure. It may simply confirm that the controller has energised or de-energised a relay. For commercial access control, monitored electric locking hardware can provide additional feedback about the door leaf, an engaged bolt or strike, or the bond between a magnetic lock and its armature. Those signals help installers diagnose faults and create better incident records, but only when the exact sensor function is verified and commissioned. This article explains the distinctions for NZ security integrators.

Three different questions a controller may ask

Door position monitoring asks whether the leaf is open or closed. Bolt or keeper status monitoring asks whether a locking component is in its intended position. Magnetic bond sensing asks whether an electromagnetic lock is achieving the particular armature contact condition detected by its sensor. These three measurements are not identical, and manufacturers may implement them with different switch arrangements. Check the exact model's wiring schedule before naming an input in software.

A controller's own lock relay state is a command indication, not independent proof of a locked door. For instance, a relay may change while a bolt is obstructed or an armature fails to align. An electronic security log is more useful if the system separately records command, door position and monitored lock feedback. However, no single feedback switch proves resistance to every form of forced entry.

What a door position sensor actually tells you

A frame-mounted magnetic contact normally reports whether a door is within a defined position relative to its frame. It is valuable for door-forced, door-held and access-granted logic. If the closer leaves the door slightly ajar, the contact may indicate open or closed depending on its mounting tolerance. The contact does not measure latch engagement or the mechanical holding force of a maglock.

Fit and test door contacts as an independent part of the access system. Ensure the sensor transition occurs at a useful point in the door's travel, not only after the door is widely open. If a contact is built into a lock body, verify what its output senses. Marketing labels such as door sensor or door monitoring are not precise enough to establish the meaning without the manufacturer diagram.

Bolt status and monitored electric strikes

Some electric bolts include a status contact or auxiliary signal, which may report bolt position, receiver engagement or another defined mechanical condition. Monitored strikes may provide keeper or latch-related feedback depending on the design. Never interpret a contact as a full secure-door proof until the manufacturer defines the sensed element, the mechanical adjustment is correct and commissioning tests demonstrate the expected event.

A lock may operate electrically while misalignment stops a bolt entering its receiver. Door sag, poorly fitted strike plates and loose hardware create repeatable faults. During commissioning, test normal closing, slightly misaligned closing where safe, blocked engagement and authorised release. Record which circumstances should produce an alarm and which should generate a maintenance event. Avoid placing a large facility into unnecessary lockdown because one auxiliary signal is momentarily inconsistent.

What bond sensing adds to a magnetic lock

Electromagnetic locks attract an armature plate while powered. An ordinary door position contact cannot tell whether the armature has proper contact with the magnet. A true bond sensing output, where supplied, responds to a manufacturer-defined magnetic or electrical condition related to holding contact. That feedback can improve detection of misalignment or failed securing, but a bond sensor is not a calibrated measurement of real-world forced-entry resistance.

Importantly, an LED on a magnetic lock is not proof that a bond monitoring output exists. Likewise, a product that explicitly includes a door sensor should not be described as providing bond sensing without evidence. Check each SKU separately. Installation details such as armature pivot, correct mounting bracket, door alignment and power supply performance are often as important as the monitoring electronics.

Configure meaningful security events

A practical access sequence records a valid credential, operates the release, sees the door open, and then expects closure and successful locking within suitable timers. Where a door position sensor and lock-state monitor are present, the controller can flag different failure modes: door left open, door closed but not secure, or unexpected opening. Door-held periods should be based on traffic and accessibility, not arbitrarily shortened to create nuisance alarms.

Test conditions such as power failure, door forced open, repeated access, slow closer action, emergency release and monitoring cable faults. Decide whether the system should create a local sounder, an operator notification, a logged incident or a monitored alarm. These responses should be agreed with the facility operator and alarm receiving centre rather than assuming every discrepancy needs an emergency dispatch.

Life safety and compliance cannot be inferred from sensors

Monitoring improves situational awareness but does not make an unsuitable locking arrangement compliant. Escape doors, fire-rated doors, fire-alarm release interfaces and accessible routes can have additional requirements. Choose locking mode, emergency release and door hardware as a complete approved system with the responsible designers and authorities. A sensor must never become a reason to defeat safe egress during a communication fault.

Test the design during loss of controller communication and loss of primary power, including backup power where fitted. Confirm that the monitoring input's active state and failure state are correctly represented. Consider whether an interrupted wire could imitate a secure indication and whether supervision is appropriate. Keep every life-safety circuit distinguishable from normal access permissions.

Manufacturer and brand options for monitored locking in New Zealand

Select monitoring by the exact model and sensor function, not only by brand. ASSA ABLOY is the parent group of both Lockwood and Trimec; those names should not be treated as three unrelated manufacturers.

dormakaba monitored electric locking

dormakaba offers monitored electric strikes and selected electromagnetic locks. For example, the KES2200 monitored electric strike is relevant to projects needing strike feedback. Some dormakaba electromagnetic models differentiate door position from bond-alert sensing. Confirm the actual outputs and operating logic in the selected model datasheet before specifying bond monitoring.

FSH monitored electric strikes

FSH electric strikes such as monitored FES-series variants can incorporate lock status, latch-sensing or anti-tamper signals. The FES20M, for example, identifies lock status, door/latch status and anti-tamper sensing as distinct features. A latch sensed within a keeper should not automatically be interpreted as equivalent to a separately mounted door position contact. Refer to the FSH electronic locks guide for related hardware selection considerations.

ASSA ABLOY monitored lock families

ASSA ABLOY's portfolio includes electromechanical locks, electric strikes and specialist door hardware under multiple brands. Monitoring capabilities may include lock-state, latch engagement, door position, key override or request-to-exit indications. These functions are model-dependent, and an electrical command output is not a substitute for independent hardware feedback.

Lockwood monitored mortice locks and drop bolts

Selected Lockwood 3570 electric mortice lock variants provide multiple status options, while the Lockwood Padde TB25 drop bolt family offers bolt position and door position monitoring. In a two-input application, the installer can evaluate the physical door position separately from the bolt state. Confirm variant, handing, compatible accessories and installation tolerances before ordering. See also our commercial electric mortice lock guide.

Trimec monitored electric strikes

Trimec ES2000 and ES2100 series electric strikes, within the ASSA ABLOY group, provide monitored variants. Outputs may describe strike locked state, latch engagement and, on compatible ES2100 configurations, door position. Check the specific model suffix and associated compatible latch hardware rather than assuming every version reports all three states.

Recommended monitoring input schedule

As part of handover, record input terminal numbers, contact polarity, supervision, alarm delays and each fault response. Test door-held-open and door-forced logic without defeating safe egress. Verify the actual fail-safe or fail-secure requirements with the approved door and fire-safety design. Refer to our access control power supply sizing guide when checking release current, standby loads and power-loss behaviour.

Specify monitoring against the actual hardware

Review the dormakaba KES2200 monitored strike, the FSH FES20M monitored strike and the Trimec ES2100 monitored strike. Their monitoring capabilities differ, so confirm each manufacturer’s wiring diagram, latch compatibility and input definitions before specifying.

For each opening, prepare an I/O schedule that names the physical condition reported, normal and fault logic, alarm delay, supervised resistance if applicable and the test method. That small piece of documentation makes subsequent commissioning, service and audit investigations far more reliable. It also prevents multiple contractors using the same label for different feedback outputs.

Practical fault example: door closed but not securely locked

Consider a commercial office door where the door-position contact reports closed but the monitored strike's relevant latch or locking-status output does not confirm engagement. The access controller may have issued a lock command successfully, yet the physical latch may be misaligned, obstructed or not seated in the keeper. Rather than recording the door as secure from the relay command alone, the system can raise a lock-status mismatch after an appropriate settling delay. An installer should check the door alignment and closer operation, verify the manufacturer's exact monitoring-contact definition, then test closed-and-locked, closed-but-unlatched and open-door conditions. Do not assume that every monitored strike exposes the same signals or that one status input independently proves the entire opening is secure.

Frequently asked questions

Is a controller lock command proof that a door is locked?

No. It reports an intended command, not an independent physical measurement.

Is a door contact the same as bolt monitoring?

No. A door contact reports leaf position, while a defined bolt-monitoring output concerns part of the locking mechanism.

Does a maglock LED always indicate bond sensing?

No. Confirm that the particular model provides a manufacturer-defined bond status contact.

Can monitoring replace a compliant emergency release?

No. Exit safety and fire-door compliance remain separate design requirements.

Explore the access control collection for related product categories and discuss exact device selection with our technical team.

Talk to Essential Security Supplies

For project-specific product selection, current technical documentation and compatible access control or alarm components, contact Essential Security Supplies for specification support or a trade quotation. Share the door type, access controller model, expected monitoring signals and installation environment. Contact our team or read the single-door planning checklist.