Allen-Bradley 1756-L63XT ControlLogix-XT Processor

1756-L63XT Logix5563 Extreme Temperature Controller

Product Introduction

The 1756-L63XT from Allen-Bradley belongs to the ControlLogix-XT (Extreme Temperature) product line, specifically designed for demanding environments where standard controllers would fail. This processor module combines substantial processing power with exceptional environmental resilience.

To begin with, this controller delivers 8 MB of user memory for complex logic and data handling, alongside 478 KB of dedicated I/O memory. Consequently, it supports up to 128,000 digital I/O points and 4,000 analog I/O channels. Additionally, it handles multiple programming languages, including relay ladder, structured text, function block, and sequential function charts.

Extreme Temperature Design and Conformal Coating

What truly distinguishes the 1756-L63XT is its rugged construction for harsh conditions. First, the module features conformal coating on its circuit boards, which protects against moisture, dust, and corrosive atmospheres. This coating proves essential in chemical plants, offshore platforms, and outdoor installations.

Furthermore, this controller operates across an extraordinary temperature range. Specifically, the operating temperature spans from -25 °C to 70 °C (-13 °F to 158 °F) , while storage temperatures range from -40 °C to 85 °C (-40 °F to 185 °F) . However, note that when you install the controller in a 1756-A7LXT chassis, the maximum surrounding air temperature decreases to 60 °C. Meanwhile, pairing it with FLEX I/O-XT products yields an operating range of -20 °C to 70 °C, which represents a slightly colder lower limit by 5 degrees compared to standalone use.

Memory Architecture and Nonvolatile Storage

The 1756-L63XT offers flexible memory options for program storage and data retention. For nonvolatile memory, you can use CompactFlash cards specifically designed for this controller. Notably, only the 64 MB (1784-CF64) or 128 MB (1784-CF128) cards are compatible. Using other cards may result in data corruption or loss.

Additionally, the controller includes a built-in RS-232 serial port for programming and communication. This port supports multiple protocols, including DF1 radio modem, DF1 full/half-duplex, ASCII, and Modbus via logic. For broader connectivity, the 1756-L63XT works with EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus (DH+), Remote I/O, SynchLink, and various third-party networks.

Task Management and Redundancy Support

This processor excels at managing complex automation workflows. Specifically, it supports three controller tasks with all event triggers, plus 32 tasks and 100 programs per task. Such capacity enables sophisticated application partitioning and execution scheduling.

Moreover, the 1756-L63XT supports up to 250 controller connections simultaneously. For mission-critical applications, it also offers full controller redundancy when paired with an identical unit on the same ControlNet network. This feature ensures high system availability and minimizes downtime risks.

Power Specifications and Environmental Ratings

Understanding the power requirements ensures reliable system operation. The 1756-L63XT draws 1200 mA at 5.1V DC and 14 mA at 24V DC from the chassis backplane. Its power dissipation measures 3.5 Watts, while thermal dissipation reaches 11.9 BTU per hour.

Furthermore, this module demonstrates excellent environmental tolerance. The relative humidity range spans from 5% to 95%, non-condensing. For shock and vibration, it withstands 30 g operating shock, 50 g non-operating shock, and 2 g vibration from 10 to 500 Hz. The isolation voltage is rated at 30V continuous, with a type-tested dielectric strength of 720V DC for 60 seconds.

Chassis Compatibility and Installation Guidelines

The 1756-L63XT fits into specialized extreme-temperature ControlLogix chassis. Compatible models include the 1756-A4LXT, 1756-A5XT, 1756-A7LXT, and 1756-A7XT. These chassis are designed to maintain reliable operation under the same harsh conditions as the controller itself.

Additionally, this single-slot module weighs just 0.78 lbs (0.35 kg) and features an open-style enclosure. For programming and configuration, the RS-232 port serves as the primary interface, though Ethernet and other network options provide flexible connectivity.

Packaging and Shipping Information

Each shipment of the 1756-L63XT includes the processor module itself. Please note that CompactFlash memory cards are optional accessories and must be ordered separately based on your specific storage needs.

We dispatch all orders via trusted global carriers, including Fedex, UPS, and DHL. The module follows the standard ControlLogix form factor and occupies one chassis slot.

Frequently Asked Questions (FAQ)

1. What makes the 1756-L63XT different from standard ControlLogix processors?
The 1756-L63XT features conformal coating and supports an extended operating temperature range from -25°C to 70°C. These attributes make it suitable for harsh, corrosive, or extreme-temperature environments.

2. What nonvolatile memory options does the 1756-L63XT support?
This controller supports CompactFlash cards for nonvolatile storage. Specifically, you can use the 1784-CF64 (64 MB) or 1784-CF128 (128 MB) cards. Rockwell Automation recommends using only approved cards to prevent data corruption.

3. Does the 1756-L63XT support controller redundancy?
Yes, the 1756-L63XT fully supports redundancy. You must pair it with an identical controller on the same ControlNet network for proper redundancy operation.

4. Which chassis are compatible with the 1756-L63XT?
Compatible chassis include the 1756-A4LXT, 1756-A5XT, 1756-A7LXT, and 1756-A7XT. These are specifically designed for extreme-temperature applications.

5. What communication protocols does the 1756-L63XT support?
This controller supports EtherNet/IP, ControlNet, DeviceNet, Data Highway Plus, Remote I/O, SynchLink, and third-party networks. The built-in RS-232 port also supports DF1, ASCII, and Modbus protocols.