Controller Module | 1756-L71S Allen-Bradley

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

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.

Shipping Options

Fast global delivery via FedEx, UPS, or DHL.