Overview
The Allen-Bradley 1760-LDFC /A is a PicoGFX processor unit designed for compact industrial automation and process control applications. This discontinued but readily available surplus module features integrated I/O capabilities and Pico-Link communication for multi-processor configurations. With 8 KB of RAM and low-power 24V DC operation, the 1760-LDFC supports up to 36 total I/O points per processor and can be networked with up to 8 additional processors for expanded capacity.
Key Features
- Integrated I/O: 24 digital inputs, 12 digital outputs, 4 analog inputs, 1 analog output
- Pico-Link Communication: Daisy-chain up to 8 processors for systems exceeding 36 I/O
- Memory: 8 KB RAM with battery-backed retention capability
- 24V DC Powered: Low-power design with 3W heat dissipation and 125 mA input current
- Electrical Isolation: Isolated power, outputs, inputs, PC interface, memory module, and expansion I/O
- Compact DIN Rail Mounting: 4.23″ × 3.54″ × 1.18″ profile fits standard control enclosures
Technical Specifications
The processor accepts a nominal 24V DC supply with input tolerance of 20.4–28.8V DC. Residual ripple is less than 5% at 24V input. Maximum input current is 125 mA with 3W heat dissipation and 10 ms voltage dip immunity. Communication occurs via RJ45 and 8-pole connectors with Pico-Link bus speeds ranging from 1000K Baud at 6 m to 10K Baud at 1000 m distance. The unit supports bus termination and provides full galvanic isolation between power, I/O, and communication circuits.
Typical Applications
- Compact packaging machine controllers with coordinated multi-axis control
- Process automation systems requiring modular I/O expansion
- Distributed control networks using Pico-Link daisy-chaining
- Retrofit projects where legacy PicoGFX systems remain in use
- Display/keypad integration for text messaging and terminal-mode remote operation
- Industrial environments with moderate I/O demands (up to 36 points per processor)
Compatibility & Replacements
The 1760-LDFC /A belongs to the Allen-Bradley Pico family and integrates seamlessly with 1760 series I/O expansion modules via Pico-Link. It is compatible with the 1760-RM-GFX remote processor for distributed monitoring and data adjustment. Since Rockwell Automation discontinued this processor in 2017, modern replacements include the CompactLogix L18 series or MicroLogix 1200 for new designs. However, for legacy system repair and maintenance, the 1760-LDFC remains the drop-in solution. Verify firmware compatibility with your development software before installation; Rockwell Studio 5000 may require specific 1760 add-on modules for support of older revision code.
