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Technical Brief: Allen-Bradley 1756-L72 ControlLogix® Processor
Positioning & Application
The 1756-L72 occupies a single slot in any ControlLogix chassis and delivers mid-range performance for discrete, motion, process, and safety applications up to SIL 2.
Typical uses include multi-axis servo lines, packaging machines, and process skids that need deterministic scan times and extensive I/O.
Memory & Performance
• User Memory: 4 MB (logic + data)
• I/O Memory: 0.98 MB
• Addressable I/O: 128 000 digital or 4 000 analog points
• Controller Tasks: 32 configurable tasks (100 programs per task) plus event tasks
Communications & Expansion
• On-board Port: 1× USB 2.0 for temporary programming
• Network Modules: EtherNet/IP, ControlNet, DeviceNet, Remote I/O, SynchLink via 1756-EN2x, CN2R, DNB, etc.
• Redundancy: Compatible with 1756-RM2 for hot-backup pairs
Power & Physical Data
• Power Dissipation: 2.5 W (8.5 BTU/hr)
• Dimensions: 7.24 H × 16.13 W × 26.16 cm, 0.385 kg
• Operating Temp: 0 … 60 °C, 5–95 % RH non-condensing
Energy Storage & Diagnostics
• 1756-ESMCAP capacitor module eliminates lithium battery maintenance
• 4-character display shows fault codes and run-state
• Online editing, role-based security, and firmware flash via Studio 5000 Logix Designer v28+
Ordering & Availability
• Part Number: 1756-L72 (latest Rev. K)
• Stock Status: WTO Automation supplies factory-sealed units with full manufacturer warranty and same-day shipping worldwide.
Contact our certified team for rack sizing, safety add-on profiles, or SIL verification documentation.
Related Hardware for a Complete 1756-L72 Solution
Communication & Networking
• 1756-EN2T / 1756-EN2TR – EtherNet/IP modules for standard or ring topologies
• 1756-CN2R – ControlNet redundant media module for deterministic peer-to-peer messaging
• 1756-DNB – DeviceNet scanner for legacy fieldbus devices
I/O & Specialty Modules
• 1756-IB32 / 1756-OB32E – 32-point 24 V dc digital input/output modules with electronic fusing
• 1756-IF8 / 1756-OF8 – 8-channel analog input/output modules (current or voltage)
• 1756-HSC – High-speed counter for encoder or pulse-train applications
Motion & Safety
• 1756-L8xS GuardLogix® Safety Partner – SIL 2/PL d safety CPU for integrated safety control
• 1756-M08SE / 1756-M16SE – SERCOS or EtherNet/IP servo interface for multi-axis motion
• 1756-RM2 – Redundancy module for hot-backup processor pairs
Power & Rack Infrastructure
• 1756-PA75 / 1756-PB75 – 75 W ac or dc power supplies
• 1756-A7 / A10 / A13 – 7-, 10-, or 13-slot ControlLogix chassis
• 1756-ESMCAP – Capacitor energy-storage module (included with 1756-L72)
All items are stocked by WTO Automation for same-day shipment and carry full manufacturer warranty.
