Two Powerful Blanking Modes in the DADISICK DK-QM Safety Light Curtain
Conventional safety light curtains stop the machine the moment any beam is broken. But on a real production line, beams get interrupted all the time for legitimate reasons: a fixed bracket sits permanently in the field, a conveyor side guide crosses the opening, or a rope or cable is fed continuously through the detection zone. Every one of those expected interruptions triggers an unnecessary stop, and every stop is lost uptime.
The DADISICK DK-QM Series safety light curtain solves this with two configurable blanking logic modes. Each mode is designed for a different class of obstruction, and both keep the remaining protective field fully active. The result: fewer nuisance stoppages, higher machine availability, and reliable detection of genuine intrusions such as hands and arms.
The Two Blanking Modes at a Glance
| Mode | What It Does | Best For |
|---|---|---|
| Fixed Blanking (Fixed Beam Blanking) | Blanks one or more specific beams at fixed, predefined positions. The blanked beams never trigger the safety output; all other beams remain fully active. | Fixed brackets, conveyor side guides, material supports, and other permanent machine structures. |
| Single-Beam Tolerance (Two-Beam Detection Logic) | Tolerates a single interrupted beam without activating the output. The output is triggered only when two or more beams are interrupted simultaneously. | Small-diameter objects such as ropes, cables and wires that continuously pass through the protected area. |
Mode 1: Fixed Blanking (Fixed Beam Blanking)
Many machines have structural components that must physically pass through the protective field: a bracket, a guide rail, a support frame or a fixed tooling fixture. With Fixed Blanking, you blank exactly the beams these structures occupy. Those beams are permanently ignored, while every other beam continues to provide normal protective detection.
Typical applications:
- Conveyor side guides
- Fixed brackets and mounting structures
- Material supports
- Fixed machine structures that cannot be removed from the opening
Mode 2: Single-Beam Tolerance (Two-Beam Detection Logic)
Fixed Blanking handles stationary obstructions. But what about objects that move through the field continuously, such as a rope, cord, cable or wire being fed into a machine? For these applications, the DK-QM can be configured with Single-Beam Tolerance, a beam-count-based interruption logic.
| Beam Condition | Detection Response |
|---|---|
| One beam interrupted | Tolerated — no output; the safety output remains in its normal state |
| Two or more beams interrupted | Output triggered — the protective field is considered interrupted |
Instead of permanently blanking a fixed position, this mode evaluates the number of simultaneously interrupted beams. A small-diameter object crossing a single beam does not stop the machine. But a hand or arm entering the field interrupts multiple beams at once, and the safety output responds immediately.
For a rope-feeding application, the net effect is simple and powerful: the continuously moving rope is tolerated, while the safety function remains fully capable of detecting a genuine intrusion.
Built for High-Precision, Type 4 Protection
The DK-QM Series combines these flexible blanking modes with high-resolution detection and robust construction:
| Parameter | DK-QM Series |
|---|---|
| Safety level | Type 4 |
| Beam pitch (optical axis spacing) | 2.5 / 5 / 10 / 20 / 40 / 80 mm |
| Detection capability | Fingers, hands, arm, body |
| Protection height | 50–3000 mm |
| Detection distance | Standard 0.3–6 m; customizable up to 45 m |
| Response time | ≤ 15 ms (as fast as 5 ms) |
| Protection rating | IP65 |
| Housing | Aluminum alloy profile, 36 × 36 mm cross-section |
| Status display | Built-in digital tube showing the real-time count of blocked beams |
Application Scenarios
Thanks to these two blanking modes and its resolution range, the DK-QM adapts to a wide range of production environments.
- Rope or cable conveying — ropes and cables pass through the field continuously
- Material feeding — slender materials are fed through while operators stay protected
- Automated production lines — complex automation with moving parts
- Packaging and palletizing — operator safety without affecting material flow
Summary
The DK-QM Series gives machine builders and plant engineers a flexible way to handle the obstructions that conventional light curtains cannot tolerate. Fixed Blanking accommodates permanent structures, while Single-Beam Tolerance allows small moving materials to pass through without stopping production, all while preserving reliable detection of genuine intrusions. Explore the full DK-QM Series specifications or contact our team to discuss your application.
