Autonics SFL20-28 Safety Light Curtains (Standard Type)
SFL20-28 Autonics Safety Light Curtains (Standard Type) provide through-beam infrared sensing, Ø20 mm hand detection, 423 mm height coverage. Manufactured by Autonics, this unit is part of Autonics Safety Light Curtains (Standard Type) within the SFL Series, using infrared LED 855 nm, 0.2–15 m sensing distance, 28 optical axes, and 24 VDC power supply.
| Brand | Autonics |
| Product Type | Safety Light Curtain |
| Model Number | SFL20-28 |
Autonics SFL20-28 Safety Light Curtains (Standard Type) – Technical Specifications
| Specification | Value |
|---|---|
| Sensing type | Through-beam type |
| Light source | Infrared LED(855nm) |
| Effective aperture angle(EAA) | Within ± 2.5 ° when the sensing distance is greater than 3 m for both emitter and receiver. |
| Sensing distance | Short - Long mode (setting switch) |
| Short mode | 0.2 to 8 m |
| Long mode | 0.2 to 15 m |
| Detection capability | Ø 20 mm (hand) |
| Sensing target | Opaque |
| Protective height | 423 mm |
| Number of optical axes | 28 |
| Optical axis pitch | 15mm |
| Series connection | Max. 3 SET (≤ 300 optical axes) |
| Power supply | 24 VDC |
| Current consumption | Emitter: ≤106mA, receiver: ≤181mA |
| Safety related output: OSSD output | NPN or PNP open collector Load voltage : ON - 24 VDC@(=) (except for the residual voltage), OFF - 0 VDC@(=) Load current : ≤ 300 mA Residual voltage : ≤ 2 VDC@(=)(except for voltage drop due to wiring) Load capability: ≤ 2.2 ㎌ Leakage current: ≤ 2.0 mA Wire resistance of load: ≤ 2.7 Ω |
| Auxiliary output(AUX 1/2) | NPN or PNP open collector Load voltage: ≤ 24 VDC@(=), Load current: ≤ 100 mA, Residual voltage: ≤ 2 VDC@(=) (except for voltage drop due to wiring) |
| Lamp output(LAMP 1/2) | NPN or PNP open collectorLoad voltage: ≤ 24 VDC@(=), Load current: ≤ 300 mA |
| Protection circuit | Reverse power polarity, reverse output polarity, output short-circuit over-current protection |
| Safety-related functions | Interlock (reset hold), external device monitoring (EDM), muting/override, Blanking (fixed blanking, floating blanking), reduced resolution |
| General functions | Self-test, alarm for reduction of incident light level, mutual interference prevention |
| Others functions | Change of sensing distance, switching to NPN or PNP, external test (light emission stops), auxiliary output (AUX 1, 2), lamp output (LAMP1, 2) |
| Synchronization type | Timing method by RS485 synchronous line |
| Insulation resistance | Over 20MΩ (at 500VDC megger) |
| Noise immunity | The square wave noise (pulse width: 1㎲) by the noise simulator ±240VDC@(=) |
| Dielectric strength | 1,000VAC 50/60Hz for 1 minute |
| Vibration | 10 mm double amplitude at frequency of 5 to 150 Hz, 10 sweeps ni each X, Y, Z direction |
| Shock | 250 m/s² (≈ 25 G), pulse width 6 ms in each X, Y, Z direction for 100 times |
| Environment_Ambient illumination | Sunlight: Max. 10,000lx, Incandescent lamp: Max. 3,000lx (received illumination) |
| Ambient temperature | -30 to 60 ℃, storage: -30 ~ 70 ℃ (no freezing or condensation) |
| Ambient humidity | 35 to 85 %RH, storage: 35 to 95 %RH (non-freezing or non-condensation) |
| Protection structure | IP65, IP67(IEC Standard), IP67G (JEM Standard), IP69K (DIN Standard) |
| Material | Case: Aluminum, Front cover and sensing part: Polymethyl methacrylate, End cap: polycarbonate, Power I/O cable and connector cable: polyurethane (PUR) or polyvinyl chloride (PVC), Y type connector cable: polyvinyl chloride (PVC), lamp output cable and series connector cable: polyurethane (PUR), Top / Bottom adjustable bracket and Top / Bottom bracket: SUS304, Side adjustable bracket and Side bracket: nickel plated Zn |
| International standards | UL 508, CSA C22.2 No. 14, ISO 13849-1 (PL e, Cat. 4), ISO 13849-2 (PL e, Cat. 4), UL 61496-1 (Type 4, ESPE), UL 61496-2 (Type 4, AOPDs), IEC/EN 61496-1 (Type 4, ESPE), IEC/EN 61496-2 (Type 4, AOPDs), IEC/EN 61508-1~-7 (SIL 3), IEC/EN 62061 (SIL CL 3) |
SFL20-28 Autonics Safety Light Curtains (Standard Type) are safety sensing devices used in industrial automation for defined access protection. This model applies through-beam sensing with an infrared light source and supports Ø20 mm hand detection across a 423 mm protective height. It belongs to the SFL Series and operates on 24 VDC, aligning with standard control system requirements in industrial environments.
In application settings, SFL20-28 Autonics Safety Light Curtains (Standard Type) are used on conveyors, packaging machines, automated assembly stations, and material handling systems. The selectable short and long sensing modes allow installation flexibility over varying distances. Multiple optical axes help maintain consistent detection when access to hazardous zones must be monitored during machine operation.
SFL20-28 Autonics Safety Light Curtains (Standard Type) deliver stable safety detection through fixed optical alignment and controlled sensing distance. The defined axis pitch, series connection support, and infrared operation contribute to predictable system behavior. As part of the SFL Series, this model reflects established manufacturing consistency and is suitable for continuous industrial automation use requiring dependable personnel protection.
