Turck BL20-PF-24VDC-D Power Feed Module for BL20 Stations

The Turck BL20-PF-24VDC-D is a power feed module designed for the BL20 modular fieldbus I/O system. It distributes 24 VDC power to connected modules and provides robust galvanic isolation between field and logic supplies. This module is essential for constructing large distributed automation networks, ensuring each I/O segment has adequate power.

Electrical Specifications

Input voltage: 24 VDC (18-30 VDC). Maximum current capacity: 8 A per feed, with two separate feed paths (supply and return) for redundancy. The module includes a built-in fuse (self-resetting) on each path and a reverse polarity protection diode. Power consumption: approximately 10 mA (without external load).

Diagnostics and Indicators

LED indicators for each feed path: green (power OK), yellow (current overload), and red (fault). The module also provides a diagnostic interface that can signal undervoltage or overcurrent conditions to the fieldbus master via the backplane.

Connection Technology

Connection is made via spring-clamp terminals for solid or stranded wires up to 1.5 mm². The module provides two separate terminal blocks: one for the input supply (from power supply unit) and one for the output to downstream modules. Terminals are marked with standard color coding.

Mechanical Design

Dimensions: 102 mm x 12 mm x 70 mm (H x W x D). Weight: approx. 80 g. Housing is made of polyamide (UL 94 V-0) and is rated for DIN-rail mounting (35 mm). Operating temperature: -25°C to +70°C, storage: -40°C to +85°C.

Integration with BL20 System

The BL20-PF-24VDC-D is placed at the beginning of a station or after an isolation module. It communicates with the bus coupler via the internal power bus and data bus. The module supports hot swapping, allowing replacement without powering down the entire station.

Protection Features

In addition to fuse protection, the module includes transient voltage suppression (TVS) diodes for ESD and surge protection. It is also protected against overvoltage up to 30 VDC continuous.

Applications

Commonly used in packaging, material handling, and conveyor systems where multiple I/O modules are distributed along a machine. It is also found in water treatment and building automation networks.

Installation and Wiring

Installation is straightforward: clip onto DIN rail, connect the 24 V supply to the input terminals, and wire the output to the adjacent modules. Proper fusing of the external supply is recommended.

Compliance

CE, UL 61010, and CCC approved. Meets EMC requirements per EN 61131-2.

In summary, the Turck BL20-PF-24VDC-D power feed module provides reliable power distribution and diagnostics, ensuring stable operation of BL20 fieldbus stations in demanding industrial environments.