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2026/11
When the safety light curtain is blocked, the equipment stops. Once the obstruction is removed and the light curtain becomes fully illuminated again, should the equipment "start by itself" or must someone press the reset button to restart it? This seemingly simple choice directly affects the personal safety of the operators.
more2026/11
In the automated control cabinet, in order to save PLC input points or to achieve a simple "AND" logic function, some people would connect two inductive proximity switches in series to drive the same relay coil. Logically, it seems very neat: the circuit will be activated only when both switches detect an object, and the relay will be attracted.
more2026/11
In industrial settings, two-wire inductive proximity switches are highly favored due to their simple wiring (only two wires, connected in series in the circuit). However, many engineers have encountered this peculiar phenomenon: when measuring the voltage at both ends of the sensor with a multimeter, the voltage is normal when it is in a static state (not triggered). But once connected to the PLC input point, even if no metal object is approaching, the input indicator light of the PLC often remains on continuously.
more2026/11
The output terminal of a safety interlock is usually labeled as "OSSD" (Output Signal Switching Device). Many field engineers, upon seeing that it outputs a 24V high level, assume it to be a normal PNP signal and directly connect it to an intermediate relay or a common PLC input point. The result is often: frequent system crashes, errors reported by the safety relay, or simply "it seems to work but fails to meet the safety standards".
more2026/11
In industrial safety protection, safety door locks serve as the final physical barrier to prevent personnel from entering dangerous areas. However, many ordinary door locks have a fatal flaw: with just a screwdriver or a common magnet, it can be made to "think that the door is closed".
more2026/10
On automated production lines, inspecting extremely fine wires, textile yarns, metal grids or perforated fences is one of the most challenging scenarios for engineers. If traditional point-shaped optical fiber sensors are used, an embarrassing phenomenon often occurs: even though the workpiece is right in front of the probe, the sensor shows no response. This is not because the sensor is broken, but rather a "missed detection" trap determined by the physical characteristics of the point-shaped light spot.
more2026/10
In precision manufacturing and automated production lines, laser displacement sensors (triangular reflection type) are commonly used to measure distance, thickness and surface profile. However, when the measured object is highly reflective material (such as polished stainless steel shafts, aluminum cylindrical rollers, or chrome-coated surfaces), many engineers will encounter a troublesome problem: the sensor data fluctuates wildly, or even completely "shows no reading".
more2026/10
In the automated operation of industrial machines, the travel control of moving parts directly affects the safety and processing accuracy of the equipment. If the worktable exceeds the safe physical limit (i.e., the over-travel) during operation, it is highly likely to cause mechanical collisions and even equipment damage. To achieve precise limit protection, proximity switches play a crucial role.
more2026/10
In industrial settings, when the opening height in hazardous areas exceeds the maximum protection height of a single safety light curtain, a single light curtain cannot achieve full coverage. If two independent light curtains are randomly combined, not only will the wiring be complicated and the cost increase, but also optical interference between the light curtains may lead to the failure of the safety function. The standard solution to this problem is cascading (Cascade) or splicing - connecting multiple light curtains in series to form a logical "long light curtain", sharing a single set of safety output externally, thereby covering extremely large openings with the simplest architecture.
more2026/10
On industrial automation production lines, detecting light-absorbing components such as black plastic parts, carbon black rubber, and dark PCB boards is a classic challenge. When ordinary diffuse reflection photoelectric sensors are used for such components, they often "work intermittently" - either there is no signal when the component is in place, or they mistakenly trigger when there is no component in the position. The reason why background suppression type (BGS) photoelectric sensors can operate stably in this scenario is fundamentally that they change the basis of detection: from "measuring how strong the reflection is" to "measuring how far the object is".
more2026/10
In the automated production lines of the packaging printing industry, color mark sensors play a crucial role as the "eyes". They output precise signals by identifying the contrast between the printed
more2026/09
The slot-type photoelectric sensor (U-shaped photoelectric switch) is widely used in automated equipment almost every day. However, many people only focus on the slot width and output type, but overlook the two unremarkable marks on the sensor housing - the scale line and the arrow. They may seem simple, but in fact, they directly affect the detection accuracy and anti-interference ability.
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