Description
The FAAC XP20B D LC – Part No. 785120 is a genuine FAAC pair of adjustable infrared safety photocells designed for automatic gates, barriers and compatible access automation systems equipped with FAAC BUS 2easy technology.
Using FAAC’s two-wire BUS 2easy connection, the XP20B D LC simplifies installation by carrying power and communication over just two non-polarised wires. The transmitter and receiver provide an infrared safety beam across the opening, allowing the automation system to detect when a vehicle, person or other obstruction enters the protected area. FAAC lists the XP20B within its current BUS 2easy accessory range.
🛡️ Infrared Safety Protection
The XP20B D LC consists of a matched transmitter and receiver positioned on opposite sides of the gate or automated opening.
An infrared beam is transmitted continuously between the two photocells. When an object interrupts the beam, the control board receives the corresponding safety command and responds according to the photocell’s programmed function.
Depending on the control board configuration, the photocells can be assigned to protect:
- Gate closing movement
- Gate opening movement
- Opening and closing movement
- Other supported BUS 2easy functions
The exact response is determined by the BUS address and programming of the compatible FAAC control board.
🔌 FAAC BUS 2easy Two-Wire Connection
One of the major advantages of the XP20B D LC is FAAC’s BUS 2easy connection system.
Only two wires are required, and the connection is non-polarised. This means there is no positive and negative polarity that needs to be maintained when connecting the photocells to the BUS 2easy line.
This can significantly simplify installation compared with conventional photocells requiring separate power and relay wiring.
FAAC specifies the XP20B system as:
- BUS 2easy connection
- Two-wire installation
- 24V BUS supply
- Non-polarised wiring
- Communication directly with compatible FAAC control boards
📡 Up to 20 Metre Operating Range
The XP20B D LC provides a maximum infrared operating distance of up to 20 metres between the transmitter and receiver.
This makes the photocells suitable for a wide variety of residential, commercial and industrial access applications, including:
- Sliding gates
- Swing gates
- Automatic barriers
- Commercial entrances
- Wide driveway openings
- Automatic access systems
Correct alignment and installation conditions are required to achieve reliable operation at longer distances.
🔄 Adjustable 180° Horizontal Orientation
The XP20B D LC features a rotating internal optical assembly allowing the beam direction to be adjusted through a wide horizontal range.
The photocells provide adjustment from -90° to +90°, giving a total horizontal adjustment range of 180°.
This is particularly useful where the photocells cannot be mounted perfectly opposite one another.
The adjustable design makes the XP20B D LC suitable for installations involving:
- Angled gate posts
- Offset mounting locations
- Uneven driveway entrances
- Existing mounting positions
- Difficult gate geometries
🎯 Vertical Self-Alignment
In addition to the adjustable horizontal orientation, the XP20B D LC provides vertical self-alignment capability.
FAAC specifies:
- ±7° self-alignment at 20 metres
- ±13.5° self-alignment at 5 metres
This provides additional tolerance during installation and helps establish reliable communication between the transmitter and receiver.
☀️ Protection Against External Light Interference
The XP20B D LC is designed to provide improved protection against interference caused by external light sources.
This is particularly useful around driveway entrances where the photocells may be exposed to:
- Vehicle LED headlights
- Strong artificial lighting
- Changing outdoor lighting conditions
FAAC specifically identifies protection from interference caused by external light sources, including vehicle LED headlights, as a feature of the XP20B BUS 2easy system.
🧠 Addressable BUS Safety Device
Unlike a conventional relay-output photocell, the XP20B D LC operates as an addressable device on the FAAC BUS 2easy network.
DIP switches within the photocells are used to assign their BUS address and therefore determine the safety function they perform.
The transmitter and receiver forming one pair must be configured with matching DIP-switch settings.
This provides greater flexibility when configuring more complex automation systems with multiple safety devices.
🔢 Multiple Safety Beam Pairs
FAAC BUS 2easy allows multiple pairs of compatible photocells to operate on the same BUS network.
FAAC specifies that the XP20B system can accommodate up to 16 pairs of photocells on the same system.
This makes the system particularly useful for more complex installations requiring multiple protected areas around a gate or automatic entrance.
Each pair must be correctly addressed according to the requirements of the control board and installation.
🚧 Opening & Closing Protection
Because each pair of XP20B D LC photocells can be assigned a BUS address, they can perform different safety functions within the same automation system.
For example, one pair may be installed across the driveway to protect the closing movement while another pair is positioned to monitor an area affected by the gate during opening.
FAAC’s addressing system provides dedicated configurations for closing, opening and combined opening/closing safety functions.
🌧️ Designed for Outdoor Installation
The XP20B D LC is designed as a surface-mounted photocell suitable for typical outdoor gate automation environments.
Its compact housing provides IP54 protection, helping protect the internal electronics against dust and water exposure associated with normal outdoor installations.
FAAC specifies an operating temperature range of:
- -20°C to +55°C
📐 Compact Surface-Mount Design
The XP20B D LC features a slim surface-mounted enclosure suitable for mounting directly to gate posts, walls and other appropriate surfaces.
The photocell dimensions are approximately:
- Height: 130mm
- Width: 41.5mm
- Depth: 42.5mm
Its narrow profile allows the photocells to be installed discreetly on many residential and commercial gate systems.
⚡ Low-Consumption LC Design
The LC version is designed as a low-consumption evolution of the XP20B photocell platform.
The BUS arrangement provides efficient communication and power distribution while retaining the simple two-wire connection associated with FAAC BUS 2easy.
This makes the XP20B D LC particularly suitable for modern FAAC automation systems using BUS-connected accessories.
🔧 Ideal for New & Existing FAAC Systems
The XP20B D LC can be used when installing a new compatible FAAC automation system or when replacing or expanding safety equipment on an existing BUS 2easy installation.
Typical applications include:
- New FAAC gate installations
- Adding safety beams to an existing gate
- Replacing damaged photocells
- Adding additional protected areas
- Upgrading existing safety equipment
- Commercial and residential gate automation
The control board must provide a compatible FAAC BUS 2easy connection.
🔄 Replacement for XP20B D – 785103
Part No. 785120 is the newer XP20B D LC version of the FAAC BUS 2easy adjustable photocell.
It supersedes the earlier XP20B D, Part No. 785103, while retaining the BUS 2easy two-wire operating principle. Current listings identify 785120 as the replacement for the earlier 785103 version.
This makes the 785120 particularly relevant when replacing an older XP20B D photocell installation.
🧰 Genuine FAAC Safety Accessory
The XP20B D LC is part of FAAC’s BUS 2easy accessory ecosystem and is designed specifically to communicate with compatible FAAC automation control boards.
FAAC’s current BUS 2easy product documentation includes XP20B among its supported photocell range alongside the XP15B and XP30B.
Using the correct BUS photocells ensures that addressing, diagnostics and safety commands can be handled correctly by the compatible FAAC control board.
📦 What’s Included
The FAAC XP20B D LC – Part No. 785120 is supplied as a pair consisting of:
- 1 x XP20B D LC Transmitter (TX)
- 1 x XP20B D LC Receiver (RX)
- Photocell covers / housings
- Installation hardware
One pair is used to create one infrared safety beam across the protected opening.
Key Features
- Genuine FAAC safety accessory
- Part No. 785120
- Model XP20B D LC
- BUS 2easy technology
- Two-wire non-polarised connection
- Infrared transmitter and receiver pair
- Maximum range up to 20 metres
- Adjustable -90° to +90° horizontal orientation
- 180° total horizontal adjustment
- Vertical self-alignment
- ±7° self-alignment at 20m
- ±13.5° self-alignment at 5m
- IP54 protection
- Designed for outdoor installation
- Protection against external light interference
- Addressable BUS operation
- Multiple safety functions available
- Supports multiple photocell pairs on compatible BUS systems
- Surface-mount design
- Suitable for gates, barriers and compatible automatic access systems
- Replaces earlier XP20B D – 785103
- Compatible FAAC BUS 2easy control board required
Specifications
- Manufacturer: FAAC
- Model: XP20B D LC
- Part Number: 785120
- Product Type: Infrared Safety Photocells
- Connection System: FAAC BUS 2easy
- Wiring: 2-Wire Non-Polarised
- BUS Voltage: 24V
- Maximum Range: 20m
- Installation Type: Surface / Wall Mount
- Horizontal Adjustment: -90° to +90°
- Self-Alignment: ±7° at 20m / ±13.5° at 5m
- Protection Rating: IP54
- Operating Temperature: -20°C to +55°C
- Dimensions: 130 x 41.5 x 42.5mm
- Communication: BUS 2easy
- Application: Automatic Gate, Barrier & Access Automation Safety
- Genuine FAAC Accessory: Yes
Compatibility
The FAAC XP20B D LC is designed for FAAC automation control boards equipped with a BUS 2easy connection.
FAAC specifically instructs that the XP20B D is to be installed only on control boards with a BUS 2easy line.
It is therefore suitable for compatible FAAC gate, barrier and access automation systems using the BUS 2easy platform.
The XP20B D LC should not be confused with the conventional XP20 D version. The XP20 D uses a traditional 24V connection, whereas the XP20B D LC communicates through the FAAC two-wire BUS 2easy system.
⚠️ Please Note
The FAAC XP20B D LC – Part No. 785120 requires a compatible FAAC control board equipped with BUS 2easy.
It is not a conventional dry-contact / relay-output safety beam and should not be connected directly to a standard photocell input unless the controller provides the appropriate BUS 2easy interface.
When installing multiple pairs of BUS photocells, each pair must be assigned the correct address. Two or more photocell pairs must not be assigned the same BUS address.
Correct positioning, alignment, BUS registration and safety testing must be completed during commissioning.
