The Allen-Bradley 1756-L71 is a high-performance ControlLogix series Programmable Automation Controller (PAC) designed for demanding industrial environments. As part of Rockwell Automation's modern Logix platform, it delivers scalable control, advanced communication capabilities, and robust reliability for medium to large automation applications, including factory and process industries.
Key Features
Processing Power & Memory
Logix5571 Processor: 500 MHz processing speed for efficient execution of complex control algorithms
Memory: 2 MB user memory (expandable to 32 MB) and 0.98 MB I/O memory for large-scale data handling
Non-Volatile Storage: 1 GB built-in storage (upgradable to 2 GB via 1784-SD2 SD card) for program and data retention
Communication & Networking
Multi-Protocol Support: Compatible with EtherNet/IP, DeviceNet, ControlNet, Remote I/O Data Highway Plus, and SynchLink for seamless integration with distributed systems
Redundancy Ready: Supports dual-chassis redundancy (Primary/Secondary automatic failover) when paired with the 1756-RM redundancy module and synchronized fiber optics
Modular Expansion: Accommodates up to 7 expansion modules (e.g., 1756-EN2TR Ethernet module) for flexible I/O and communication scaling
I/O Capacity
Maximum I/O: Handles up to 128,000 discrete I/O points and 4,000 analog I/O points, ideal for large-scale control systems
User Interface & Connectivity
Onboard Display: 4-character alphanumeric LCD for real-time monitoring of operational status, module info, and diagnostic alerts
USB Port: Full-speed USB 2.0 interface for programming, configuration, firmware updates, and online edits
Reliability & Environment
Isolation: 30V continuous isolation voltage for enhanced electrical protection
Operating Conditions: Works in 0-60°C (32-140°F) temperatures, 5-95% non-condensing humidity, and withstands 2G vibration (10-500 Hz) and 30G operational shock
Power Efficiency: 2.5W max power consumption with 8.5 BTU/hour heat dissipation