Allen-Bradley 1756-L908TS ControlLogix 5590 Controller

8 MB User Memory | 8 MB Safety Memory | High-Availability, High-Performance PAC

The Allen-Bradley 1756-L908TS is a top-tier controller in the ControlLogix 5590 family, designed for high-performance industrial environments that demand fast execution, large I/O capacity, functional safety, and network-dense architectures.
It combines a powerful processing engine with built-in cyber-secure firmware, dual EtherNet/IP ports, safety-rated memory, and support for large distributed systems — making it ideal for heavy industrial automation, critical infrastructure, and high-availability plant networks.

Technical Overview & Core Performance

High-Performance CPU With Independent Safety Memory

• 8 MB user memory for application logic, tags, AOIs, motion profiles, and diagnostics
• 8 MB dedicated safety memory, enabling dual-partition standard + safety execution
• Executed using ControlLogix multi-tasking architecture, supporting continuous, periodic, and event tasks simultaneously
• Suitable for SIL2 functional safety applications (IEC 61508 certified)

Communication & Networking Capabilities

Dual EtherNet/IP Ports (Integrated Redundancy)

• 2× industrial Ethernet interfaces, each supporting high-speed EtherNet/IP
• Supports up to 200 EtherNet/IP nodes, making it suitable for large distributed systems
• Native support for:
• TCP/IP
• DeviceNet
• SERCOS motion networks
• EtherNet/IP (I/O + Motion + HMI + SCADA)
• IEC 61850 Ethernet (ideal for power utility / substation environments)

USB Programming Port

• 1× USB port for fast local programming and commissioning using Studio 5000 Logix Designer

Integrated Motion Control Function

• Supports EtherNet/IP motion for servo drives, VSDs, and multi-axis coordinated systems
• This combination allows the 1756-L908TS to operate as the central controller for hybrid process plants, fast discrete machine lines, and complex motion systems.

I/O & System Capacity

• Analogue Inputs: up to 4,000
• Analogue Outputs: up to 4,000
• Digital Inputs: up to 128,000
• Digital Outputs: up to 128,000
• Fully compatible with all ControlLogix 1756 chassis sizes
• Supports rack-based redundancy for critical uptime environments
• This extremely large I/O capacity positions the 1756-L908TS as a heavy-industrial controller suitable for multi-building or whole-plant automation solutions.

Construction & Mechanical Specifications

Industrial Design

• IP20 rated, suitable for cabinet integration
• Robust ControlLogix hardware designed for high-noise, high-vibration industrial sites
• Integrated display for status, diagnostics, and commissioning

Dimensions

• Width: 34.57 mm
• Height: 145.21 mm
• Depth: 145 mm

The small footprint allows high-density controller configurations without sacrificing performance.

Typical Applications

Industries Where the 1756-L908TS Excels

• Water & wastewater treatment plants
• Mining, minerals & tailings control
• Oil & gas / LNG process facilities
• Power generation & substation control (IEC 61850 compliant)
• Food & beverage high-speed packaging
• Heavy industrial manufacturing
• Chemical & pharmaceutical batching
• Critical infrastructure with redundancy requirements

Use Cases

• Large process automation systems
• Redundant controller architectures
• High-speed digital signal processing
• EtherNet/IP motion control
• Safety-rated machine and process control
• Large SCADA + MES-connected plants
• Why Choose the 1756-L908TS?
• High-density I/O capability suitable for plant-wide automation
• Integrated safety CPU and safety memory in one module
• Extremely strong network support including IEC 61850
• Designed for redundant architectures and mission-critical uptime
• Seamless integration with FactoryTalk, Studio 5000, PanelView, PowerFlex, and PlantPAx systems
• Long-term product support from Rockwell Automation

• Technical Manual Link below.

1756L908TS-AU-ControlLogix-5590-Controller-Datasheet