1756-L63S | AB Allen Bradley | GuardLogix Safety Processor Module

Product Summary

The Allen-Bradley 1756-L63S is a GuardLogix Safety Controller by Rockwell Automation, combining standard ControlLogix control with integrated SIL 3 / PLe safety functionality in a single processor. It eliminates the need for a separate safety PLC by executing both standard and safety tasks within one chassis, reducing hardware cost and cabinet footprint while maintaining full compliance with IEC 61508 and IEC 62061 safety standards.

Core Specifications

• Model Number: 1756-L63S
• Type: GuardLogix Safety Controller
• Safety Rating: SIL 3 / PLe (Cat 4)
• User Memory: 8 MB standard + 4 MB safety
• I/O Capacity: 128,000 digital / 4,000 analog I/O points
• Chassis Slots: 4, 7, 10, 13, 17 (1756 series)
• Communication: EtherNet/IP, ControlNet, DeviceNet via 1756-EN2T, 1756-CN2R, 1756-DNB modules
• Programming: Studio 5000 Logix Designer with GuardLogix safety editor
• Manufacturer: Allen-Bradley by Rockwell Automation

Electrical & Functional Characteristics

• Backplane Current: 1.2 A at 5.1 VDC; 0.014 A at 24 VDC
• Power Dissipation: 6.2 W typical
• Task Types: Continuous, periodic, event, and safety tasks
• Safety Task Period: Configurable down to 6 ms
• Redundancy Support: Compatible with 1756-RM2 redundancy modules for high-availability safety systems
• Status Indicators: RUN, FORCE, SD (safety disabled), SF (safety fault), and I/O status LEDs

System Integration & Compatibility

• Primary Platform: ControlLogix / GuardLogix 1756 chassis
• Safety I/O Modules: 1756-LSC8XIB8I, 1756-LSC8XIB8I, 1756-LSC8XIB8I, POINT Guard I/O, FLEX 5000 Safety I/O
• Motion Control: Integrated via SERCOS interface or EtherNet/IP with Kinetix drives
• Software Version: Studio 5000 v20 or later with GuardLogix safety license
• Related Parts: 1756-L61S (2 MB safety), 1756-L62S (4 MB safety), 1756-L73S (16 MB safety), 1756-LSP (safety partner module for dual-processor SIL 3)

Environmental & Operational Limits

• Operating Temperature: 0°C to 60°C (32°F to 140°F)
• Storage Temperature: -40°C to +85°C (-40°F to 185°F)
• Humidity: 5% to 95% RH, non-condensing
• Vibration: 2G, 10 to 500 Hz
• Shock: 30G, 11 ms
• Approvals: TÜV Rheinland certified for SIL 3 / PLe, CE, UL, CUL, ATEX

Industrial Applications

Widely deployed in automotive stamping and welding, packaging machinery with light curtains and e-stops, robotic cells with safety zones, material handling with conveyor interlocks, and process industries requiring emergency shutdown (ESD) systems.

Frequently Asked Questions

What is the 1756-L63S used for?

It is a GuardLogix safety controller that combines standard PLC control and SIL 3 / PLe safety functionality in one processor, eliminating the need for a separate safety PLC.

What is the difference between 1756-L63 and 1756-L63S?

The 1756-L63 is a standard ControlLogix controller with 8 MB memory. The 1756-L63S adds integrated safety functionality with 4 MB dedicated safety memory and SIL 3 / PLe certification.

Do I need a safety partner module?

For SIL 3 / PLe applications, the 1756-LSP safety partner module is required in an adjacent slot to provide dual-processor redundancy and cross-checking. Without the LSP, the controller operates at SIL 2 / PLd.

What software do I need to program it?

Studio 5000 Logix Designer v20 or later with the GuardLogix safety editor and appropriate safety task license.

What are the related part numbers?

• 1756-L61S — GuardLogix, 2 MB standard + 1 MB safety
• 1756-L62S — GuardLogix, 4 MB standard + 2 MB safety
• 1756-L63S — GuardLogix, 8 MB standard + 4 MB safety (this part)
• 1756-L73S — GuardLogix, 16 MB standard + 8 MB safety
• 1756-LSP — Safety Partner Module (required for SIL 3 / PLe)