PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1756-L81ES is a ControlLogix Safety Controller. This GuardLogix 5580 processor provides 3 MB of user memory and 1.5 MB of safety memory. It includes 2 GB of nonvolatile memory and supports 128,000 total I/O points. The controller can execute 31 standard tasks alongside one dedicated safety task. Each task supports up to 1000 programs in execution.
The module features an integrated USB 2.0 port and a gigabit Ethernet port. The Ethernet port operates at speeds of 10, 100, and 1000 Mbps. It directly manages up to 100 Ethernet/IP nodes. A removable 1756-SD2 secure digital card provides auxiliary nonvolatile storage. The unit operates across temperatures between 0 and 60 degrees Celsius.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| UPC | 889508112282 |
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| Weight | 1.31 lbs (0.60 kg) |
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| Communication | USB, Ethernet |
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| Ethernet Communication Speed | 10 / 100 / 1000 Mbps |
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| USB Communication Speed | 12 Mbps |
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| Network Connections | 256 EtherNet/IP; 128 TCP (1756-EN2x) 128 EtherNet/IP; 64 TCP (1756-ENBT) 100 ControlNet (1756-CN2/A) 40 ControlNet (1756-CNB/D, 1756-CNB/E) 128 ControlNet (1756-CN2/B) |
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| Maximum Ethernet nodes | 100 |
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| Power dissipation | 6.2 Watts |
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| User memory | 3 MB |
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| Safety memory | 1.5 MB |
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| Nonvolatile memory | 2 GB |
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| Maximum I/O | 128,000 |
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| Operating temperature | 0 to 60 degrees Celsius |
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| Programming Languages | For the safety task, GuardLogix controllers support Ladder Diagram only. For standard tasks, GuardLogix controllers support: – Ladder Diagram (LD) – Structured Text (ST) – Function Block Diagram (FBD) – Sequential Function Chart (SFC) |
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TECHNICAL INFORMATION
Features
- Features 3 MB user memory and 1.5 MB dedicated safety memory.
- Includes integrated USB 2.0 port operating at 12 Mbps.
- Provides integrated 10/100/1000 Mbps Ethernet port supporting 100 nodes.
- Supports up to 128,000 digital I/O points and 4,000 analog I/O points.
- Accommodates up to 31 standard tasks and 1 safety task.
- Equipped with 2 GB internal nonvolatile memory.
- Compatible with removable 1756-SD2 memory cards.
TECHNICAL INFORMATION
Applications
- Industrial functional safety systems requiring SIL 2 performance ratings.
- Integrated control systems blending standard automation and machine safety monitoring.
- High-speed machine cell automation using Ethernet/IP distributed field devices.
TECHNICAL INFORMATION
Connections / Interfaces
- One USB 2.0 port supporting 12 Mbps communication speed.
- One RJ45 Ethernet port supporting 10, 100, and 1000 Mbps.
- Optional network interface support via ControlNet, DeviceNet, DH+, and Remote I/O chassis modules.
TECHNICAL INFORMATION
Installation Guidelines
- The controller mounts in a single slot of any compatible ControlLogix chassis.
- Compatible chassis include standard and conformal coated 1756-A4, 1756-A7, 1756-A10, 1756-A13, and 1756-A17 units.
- Ensure chassis power supply capacity matches total backplane current requirements.
TECHNICAL INFORMATION
Configuration Guidelines
- Standard tasks support Ladder Diagram, Structured Text, Function Block Diagram, and Sequential Function Chart.
- The safety task supports Ladder Diagram programming only.
- Configure Ethernet network settings to handle up to 100 Ethernet/IP nodes.
TECHNICAL INFORMATION
Compatibility
- Compatible with standard and conformal ControlLogix chassis series B and C.
- Works with power supplies such as 1756-PA72, 1756-PA75, 1756-PB72, and 1756-PB75.
- Requires 1756-SD2 secure digital card for removable nonvolatile memory functions.
TECHNICAL INFORMATION
Compliance and Certifications
- Achieves Safety Integrity Level 2 (SIL 2) capability.
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with standard and conformal ControlLogix chassis series B and C. Works with power supplies such as 1756-PA72, 1756-PA75, 1756-PB72, and 1756-PB75. Requires 1756-SD2 secure digital card for removable nonvolatile memory functions.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
What is the memory capacity of the Allen-Bradley 1756-L81ES?
The 1756-L81ES provides 3 MB of user memory and 1.5 MB of dedicated safety memory. It also includes 2 GB of nonvolatile memory.
Which programming languages are supported for safety tasks?
Safety tasks on the 1756-L81ES support Ladder Diagram only. Standard tasks support Ladder Diagram, Structured Text, Function Block, and Sequential Function Chart.
How many Ethernet nodes can the 1756-L81ES manage directly?
The integrated Ethernet port can support up to 100 Ethernet/IP nodes at speeds up to 1000 Mbps.
Which removable memory card is compatible with this controller?
The module uses the 1756-SD2 card as its compatible removable memory media.
