Description

Allen-Bradley 1756-L84ES

The Allen-Bradley 1756-L84ES is a high-performance controller designed for use in safety applications. It is manufactured by Allen-Bradley and is part of the ControlLogix series. This controller is ideal for applications requiring Safety Integrated Level (SIL) 3 and Performance Level (PL)e certification.

It features robust communication capabilities and integrated safety functions, making it a reliable choice for complex automation systems. The 1756-L84ES is engineered to enhance system performance and efficiency with advanced processing power and extensive memory resources.

Technical Description:

The 1756-L84ES controller offers Ethernet performance with speeds of 10/100/1000 megabits per second. It includes a USB 2.0 port and an embedded Ethernet port for versatile communication options. The controller is equipped with 20 megabytes of user memory and 6 megabytes of dedicated safety memory.

It supports digital and analog I/O with a maximum capacity of 128,000/4000 points. The controller can handle up to 250 EtherNet/IP nodes, allowing extensive network connectivity. The current draw at 1.2 volts DC is 5.0 milliamps, while at 5.1 volts DC, it is 1.2 amps. The device weighs 0.39 kilograms (0.868 pounds).

In addition to its user and safety memory, the 1756-L84ES supports optional nonvolatile SD memory cards for additional storage. This allows for expanded memory capacity, which is essential for complex automation tasks.

Performance and Capabilities:

The 1756-L84ES can manage up to 31 standard tasks and one safety task, providing flexibility in task management. It supports up to 1000 programs per task, regardless of the task type. The controllers integrated safety features enable secure operation on the EtherNet/IP network.

It is capable of motion control over Ethernet I/P, facilitated by the Serial Real-Time Communication System (SERCOS) interface. This feature supports various devices such as Kinetix drives and PowerFlex drives, enhancing overall system control.

Communication and Integration:

The built-in communication options of the 1756-L84ES include EtherNet/IP, ControlNet, and DeviceNet, ensuring compatibility with a wide range of industrial networks. The controller supports several programming languages mandated by the IEC-61131-3 standard, including Ladder Diagram (LD), Structured Text (ST), Function Block Diagram (FBD), and Sequential Function Chart (SFC).

For safety tasks, only ladder programming is supported. The USB port on the controller supports full speeds of up to 12 megabits per second, enhancing data transfer capabilities.

Standard Operating Precautions:

When using the 1756-L84ES controller, adhere to standard operating precautions to ensure safety and performance. Ensure that the controller is installed in a suitable environment, free from excessive vibration, dust, and temperature extremes. Proper grounding and shielding of communication cables are essential to prevent electrical noise interference.

Regularly update firmware and software to the latest versions to benefit from improved features and security patches. Perform routine maintenance checks to ensure all connections are secure and the system is functioning correctly.

Frequently Asked Questions:

What connectivity options are available in the 1756-L84ES controller?

The 1756-L84ES controller includes a USB 2.0 port and an embedded Ethernet port. It supports EtherNet/IP, ControlNet, and DeviceNet networks. These options allow for versatile and extensive network integration.

How much memory does the 1756-L84ES controller have?

The controller has 20 megabytes of user memory. It also includes 6 megabytes of dedicated safety memory. Optional nonvolatile SD memory cards can expand storage capacity further.

What is the maximum number of I/O points the 1756-L84ES can handle?

The 1756-L84ES supports up to 128,000 digital I/O points and 4000 analog I/O points. This allows for extensive input and output configurations. It suits complex automation systems.

Product Specifications Table

Attribute	Specifications
Series	ControlLogix
Product Type	Controller
No. of Outputs	128,000 Digital / 4000 Analog
Conversion Rate	Up to 12 Mbps (USB 2.0)
Ethernet Performance	10/100/1000 Mbps
Safety Memory	6 MB
User Memory	20 MB
Supported Nodes	250 EtherNet/IP
Power Consumption	5.0 mA at 1.2V DC / 1.2A at 5.1V DC
Weight	0.39 kg (0.868 pounds)