1756-L81E ControlLogix 5580 Processor | Allen-Bradley 3 MB PAC

Allen-Bradley, a Rockwell Automation brand, makes the 1756-L81E for compact control tasks. This ControlLogix 5580 processor provides 3.00 MB user memory, 128,000 digital I/O, and 4,000 analog I/O.

Highlights of 1756-L81E

• Part of ControlLogix 5580 series; 32 tasks, 1,000 programs per task.
• 1 USB 2.0 port: 12.00 Mbps; 1 Gigabit Ethernet: 10/100/1000 Mbps, auto‑negotiation.
• Supports up to 60 EtherNet/IP nodes; programs in Studio 5000; energy‑storage RAM backup.

Core Specs – Brand: Allen-Bradley | Model: 1756-L81E

• User memory: 3.00 MB
• Max digital I/O: 128,000; Max analog I/O: 4,000
• Ethernet: 10/100/1000 Mbps; USB: 12.00 Mbps
• Ethernet nodes: 60; Power: 6.20 W; Thermal: 21.20 BTU/hr
• Current: 1.20 A at 5.10 V DC; 5.00 mA at 1.20 V DC
• Isolation: 50.00 V continuous; 
• Temp: 0.00–60.00 °C (32.00–140.00 °F); Humidity: 5–95%
• Vibration: 2.00 g at 10–500 Hz; Shock: 30.00 g; Certs: UL, CE, IECx.

Installation Tips

• Install in 1756‑A4/A7/A10/A13/A17 Series B or C chassis; single slot width.
• Use standard or redundant power supplies; connect USB for programming, Ethernet for I/O.

Package Contents

• One 1756-L81E controller module; ships via FedEx, UPS, DHL.

FAQ

• Q: Memory size of 1756-L81E?
  A: 3.00 MB user memory.
• Q: Max EtherNet/IP devices supported?
  A: 60 nodes.
• Q: Does it need a battery for RAM?
  A: No, uses energy‑storage solution, no battery required.