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Allen Bradley ControlLogix 1756-L81ES

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1756-L81ES

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The 1756-L81ES is a GuardLogix controller module by Allen-Bradley. It comes with User Memory of 3MB, Safety Memory of 1.5 MB and built-in Ethernet and USB communication interface. It is capable of 128,000 Discrete I/O and 4000 Analog I/O memory.

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Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer's warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

Technical specifications for 1756-L81ES

ManufacturerAllen Bradley
Product typeGuardLogix 5580 Safety controller
Product LineControlLogix
Part Number1756-L81ES
UPC889508112282
Weight0.94 lbs (0.43 kg)
CommunicationUSB, Ethernet
Ethernet Communication Speed10 / 100 / 1000 Mbps
USB Communication Speed12 Mbps
Network Connections256 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)
Maximum Ethernet nodes100
Power dissipation6.2 Watts
User memory3 MB
Safety memory1.5 MB
Nonvolatile memory2 GB
Maximum I/O128,000
Operating temperature0 to 60 degrees Celsius
Programming LanguagesFor 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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The Allen-Bradley 1756-L81ES controller is an Allen-Bradley GuardLogix 5580 safety controller. It can perform 31 standard tasks and 1 safety task. The number of programs supported per task is 1000 programs. The integrated communication ports on the 1756-L81ES controller include one USB port and one Ethernet port. The USB port complies with the USB 2.0 standards and it supports a 12 Mbps data rate. The Ethernet port can support 10/100, and1000 Mbps data rates. The optional communication modules available for the 1756-L81ES controller include the ControlNet, DeviceNet, Remote I/O, DH+, and SynchLink modules. The maximum number of Ethernet/IP nodes supported is 100 nodes.

The following programming languages are supported on the 1756-L81ES controller are the ladder diagram, structured text, function block diagram, and the sequential function chart languages. Controller redundancy is not supported. The user memory capacity on the module is 3 MB and safety memory capacity is 1.5 MB. The maximum number of digital and analog I/Os that are supported are 128,000 and 4000, respectively. The 1756-L81ES controller can support a total of 128,000 I/O. The module comes with 2 GB of integrated nonvolatile memory. The current drawn by the module at 1.2 Volts DC is 5 milliamps and at 1.5 Volts DC, the current draw is 1.2 Amps. The power dissipated as heat during operation is 6.2 Watts. The approximate module weight is 0.394 kilograms. The 1756-L81ES controller requires one empty slot in the chassis for installation. Chassis that are compatible with the 1756-L81ES include the 1756-A4, 1756-A4K, 1756-A7, 1756-A7K, 1756-A10, 1756-A10K, 1756-A13, 1756-A13K,1756-A17, and the 1756-A17 K Series B and Series C chassis. The operating temperature range is from 0 to 60 degrees Celsius.

The Allen-Bradley 1756-L81ES is a GuardLogix controller that features an integrated user memory of 3 MB and Safety memory of 1.5 MB, Similar to ControlLogix controllers, this controller features a maximum I/O capacity of 128,000. It has an integrated communication port of USB and Ethernet.

Unlike ControlLogix controllers, this GuardLogix controller has an integral and removable memory of 1756-SD2, which is the only compatible memory for this controller module.

This module supports a wider variety of Chassis. Though this is a GuardLogix controller, it may installed in Standard and Conformal ControlLogix chassis such as 1756-A4, 1756-A4K, 1756-A7, 1756-A7K, 1756-A10, 1756-A10K, 1756-A13, 1756-A13K,1756-A17, 1756-A17 K Series B, Series C. It may also be used with an even wider choices of Power Supply module such as 1756-PA50, 1756-PA72, 1756-PA72K, 1756-PA75, 1756-PA75K, 1756-PB50, 1756-PB72, 1756-PB72K, 1756-PB75, 1756-PB75K, 1756-PH75, 1756-PC75.

This module supports implementation of redundancy with the use of ControlLogix redundancy modules. For this high-availability requirement, the compatible power supply are 1756-PA75R, 1756-PA75RK, 1756-PB75R, 1756-PB75RK, 1756-PSCA2, 1756-PSCA2K.

It has an intuitive diagnostic display that provides a textual description of the module’s status.

With the use of this controller, Safety Instrumentation Level (SIL) 2 is achieved. This module supports mix of standard ControlLogix and Safety I/O and may also implement topologies that a standard ControlLogix can support.