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Controller Module | 1756-L71S Allen-Bradley

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Allen-Bradley 1756-L71 & 1756-L71S ControlLogix & GuardLogix Controllers

Description

The Allen-Bradley 1756-L71 is a ControlLogix Series A programmable automation controller (PAC) with 2 MB user memory and 0.98 MB I/O memory. It features a 4-character display for diagnostics and supports redundancy on ControlNet networks. The 1756-L71S is its safety variant, adding 1 MB safety memory and SIL 3/Cat. 4/PLe compliance when paired with a 1756-L7SP safety module. Both models include a USB port and use SD cards (1GB/2GB) for non-volatile storage.

Technical Data

Brand: Allen-Bradley (Rockwell Automation)

Model: 1756-L71 / 1756-L71S

Memory: 2 MB (user), 0.98 MB (I/O), 1 GB SD card (expandable to 2 GB)

Safety Memory: 1 MB (1756-L71S only)

I/O Capacity: 128,000 digital / 4,000 analog

Communication: 1 USB port, supports EtherNet/IP, ControlNet, DeviceNet

Power: 5 mA @1.2V DC, 800 mA @5.1V DC

Operating Temp: 0°C to 60°C (32°F to 140°F)

Installation & Compatibility

Fits all 1756 ControlLogix chassis (e.g., 1756-A4, 1756-A10, 1756-A17). Requires 1756-ESMCAP energy storage module (no battery). Safety version (L71S) must pair with 1756-L7SP module. Use only Rockwell 1784-SD1/SD2 SD cards to avoid data corruption.

Certifications

1756-L71S meets SIL 3, Category 4/PLe safety standards. Both models are CE, UL, ATEX certified.

Package Includes

  • 1756-L71 or 1756-L71S controller
  • 1 GB SD card (1784-SD1)
  • Energy storage modules (1756-ESMCAP/ESMCAPK)
  • Documentation CD

Real-World Applications

Used in automotive assembly lines, pharmaceutical safety systems, and oil/gas shutdown controls. The L71S is ideal for machine guarding and emergency stop systems.

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