1756-L55 | Allen-Bradley ControlLogix Processor Module for Industrial Automation Systems
1756-L55 | Allen-Bradley ControlLogix Processor Module for Industrial Automation Systems
1756-L55 | Allen-Bradley ControlLogix Processor Module for Industrial Automation Systems
1756-L55 | Allen-Bradley ControlLogix Processor Module for Industrial Automation Systems
1756-L55 | Allen-Bradley ControlLogix Processor Module for Industrial Automation Systems
1756-L55 | Allen-Bradley ControlLogix Processor Module for Industrial Automation Systems
1756-L55 | Allen-Bradley ControlLogix Processor Module for Industrial Automation Systems
1756-L55 | Allen-Bradley ControlLogix Processor Module for Industrial Automation Systems
1756-L55 | Allen-Bradley ControlLogix Processor Module for Industrial Automation Systems
    1756-L55 | Allen-Bradley ControlLogix Processor Module for Industrial Automation Systems
    1756-L55 | Allen-Bradley ControlLogix Processor Module for Industrial Automation Systems
    1756-L55 | Allen-Bradley ControlLogix Processor Module for Industrial Automation Systems
1756-L55 | Allen-Bradley ControlLogix Processor Module for Industrial Automation Systems
1756-L55 | Allen-Bradley ControlLogix Processor Module for Industrial Automation Systems
1756-L55 | Allen-Bradley ControlLogix Processor Module for Industrial Automation Systems

1756-L55 | Allen-Bradley ControlLogix Processor Module for Industrial Automation Systems

Part #: 1756-L55 Manufactured by: Allen-Bradley
Regular price
$557.00
Sale price
$557.00
Regular price
6 in Stock
Condition: New – Open box
Shipping calculated at checkout.
Product Overview
Allen-Bradley 1756-L55 ControlLogix Logix 5555 Processor, No User Memory
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Product Description P/N: 1756-L55

Description / Specifications

Description 

The Allen-Bradley 1756-L55 is a ControlLogix processor module designed for applications requiring reliable CPU performance within modular automation systems. This module provides essential controller functionality and supports multiple communication options through the ControlLogix backplane. The 1756-L55 is commonly deployed in medium to large industrial automation environments where dependable system control is required.

 

 

Technical Specifications 

Condition New/Never Used Surplus
Brand Allen-Bradley
Category PLCs and Accessories
Part Number 1756-L55
Subcategory PLC Processor Modules
Series ControlLogix
User Memory None
Backplane Current (5.1 VDC) 1.23–1.25 A
Backplane Current (24 VDC) 0.014 A
Power Dissipation 5.6–5.7 W
Thermal Dissipation 19.1–19.4 BTU/hr
Isolation Voltage 30 V continuous
Enclosure Type Open-style
Battery 1756-BA1 included
Operating Temperature 0°C to 60°C
Storage Temperature –40°C to 85°C
Communication Port RS-232
Test Voltage Rating Withstands 707 VDC for 60 seconds
IEC Temperature Code T4
Compatible Cables 1756-CP3, 1747-CP3
Weight 0.35 kg

 


Information About 1756-L55

The 1756-L55 is a Series A ControlLogix processor module built to integrate seamlessly with Allen-Bradley’s modular 1756 platform. It operates without internal user memory and relies on external memory components and a 1756-BA1 battery to maintain operation. The module supports standard ControlLogix backplane communication, making it compatible with a wide range of I/O modules, communication adapters, and chassis configurations. Engineered for industrial conditions, it meets relevant environmental and electrical standards, allowing stable performance across the specified temperature and storage ranges.

Key Features:

  • ControlLogix Architecture: Designed for use within 1756 ControlLogix systems requiring centralized processing.
  • Backplane Power Compatibility: Supports 1.23–1.25 A at 5.1 VDC and 0.014 A at 24 VDC for reliable chassis communication.
  • Open-Style Enclosure: Enables installation in protected control cabinet environments.
  • Included Backup Battery: Ships with a 1756-BA1 battery for maintaining critical memory functions.
  • Industrial Operating Range: Functions from 0°C to 60°C to support standard automation environments.
  • Isolation Voltage Rating: Provides 30 V continuous isolation for controller protection.
  • Thermal Efficiency: Maintains low power dissipation levels at 5.6–5.7 W for improved system efficiency.
  • Shock and Vibration Compliance: Built to withstand industrial environmental conditions as defined by applicable IEC standards.

The 1756-L55 delivers the reliability and precision required for dependable control processing in industrial automation systems.

Frequently Asked Questions about 1756-L55
Question: What are the main features of the Allen-Bradley 1756-L55 processor module?
Date Update:04/06/2025
Answer:

The 1756-L55 is a ControlLogix Logix5555 processor module designed for high-performance industrial automation applications. It features a 100 MHz processor and supports up to 128 discrete and 128 analog I/O points. The module does not include internal user memory but is compatible with external memory modules for flexible data handling. It offers integrated communication via Ethernet, ControlNet, and DeviceNet, making it suitable for complex manufacturing environments.

Question: What are the power requirements and physical specifications of the 1756-L55 module?
Date Update:04/06/2025
Answer:

The 1756-L55 operates with a backplane current of 1.23 to 1.25 Amps at 5.1 Volts DC and 0.014 Amps at 24 Volts DC. It has a power dissipation rating of 5.6 to 5.7 Watts and a thermal dissipation of 19.1 to 19.4 BTU per hour. The module weighs approximately 0.35 kilograms (12.5 ounces) and is designed for open-style enclosures. It includes a 1756-BA1 battery for memory retention.

Question: What communication interfaces are supported by the 1756-L55 processor?
Date Update:04/06/2025
Answer:

The 1756-L55 processor module supports various communication options, including Ethernet, ControlNet, and DeviceNet networks. It also features an RS-232 serial port that supports communication protocols such as ASCII, DF1 full/half-duplex, DF1 radio modem, DH-485, and Modbus via logic functions.

Question: What are the operating and storage temperature ranges for the 1756-L55 module?
Date Update:04/06/2025
Answer:

The 1756-L55 is designed to operate within a temperature range of 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit). For storage, it can withstand temperatures from -40 to 85 degrees Celsius (-40 to 185 degrees Fahrenheit), making it suitable for various industrial environments.

Question: Does the 1756-L55 processor module come with user memory, and how is memory managed?
Date Update:04/06/2025
Answer:

The 1756-L55 processor module does not include internal user memory. However, it is compatible with external memory modules, allowing users to manage and store application programs and data as needed. This design provides flexibility in memory management for different application requirements.

IQElectro is not an authorized distributor.
IQElectro LLC (IQElectro) is NOT an Authorized Distributor or in any way affiliated with Rockwell Automation, Siemens, or any other Manufacturers. IQElectro is NOT an Authorized Dealer of this product. The product may be of older version, date codes, or design than that available from authorized dealers. As IQElectro is not an authorized dealer of this product, the Original Manufacturer's Warranty and Support DO NOT apply. IQElectro sells SURPLUS only and DOES NOT SELL SOFTWARE or FIRMWARE licenses For more detailed information, please refer to the full version of our disclaimer policy Disclaimer Policy.
Description / Specifications

Description 

The Allen-Bradley 1756-L55 is a ControlLogix processor module designed for applications requiring reliable CPU performance within modular automation systems. This module provides essential controller functionality and supports multiple communication options through the ControlLogix backplane. The 1756-L55 is commonly deployed in medium to large industrial automation environments where dependable system control is required.

 

 

Technical Specifications 

Condition New/Never Used Surplus
Brand Allen-Bradley
Category PLCs and Accessories
Part Number 1756-L55
Subcategory PLC Processor Modules
Series ControlLogix
User Memory None
Backplane Current (5.1 VDC) 1.23–1.25 A
Backplane Current (24 VDC) 0.014 A
Power Dissipation 5.6–5.7 W
Thermal Dissipation 19.1–19.4 BTU/hr
Isolation Voltage 30 V continuous
Enclosure Type Open-style
Battery 1756-BA1 included
Operating Temperature 0°C to 60°C
Storage Temperature –40°C to 85°C
Communication Port RS-232
Test Voltage Rating Withstands 707 VDC for 60 seconds
IEC Temperature Code T4
Compatible Cables 1756-CP3, 1747-CP3
Weight 0.35 kg

 


Information About 1756-L55

The 1756-L55 is a Series A ControlLogix processor module built to integrate seamlessly with Allen-Bradley’s modular 1756 platform. It operates without internal user memory and relies on external memory components and a 1756-BA1 battery to maintain operation. The module supports standard ControlLogix backplane communication, making it compatible with a wide range of I/O modules, communication adapters, and chassis configurations. Engineered for industrial conditions, it meets relevant environmental and electrical standards, allowing stable performance across the specified temperature and storage ranges.

Key Features:

  • ControlLogix Architecture: Designed for use within 1756 ControlLogix systems requiring centralized processing.
  • Backplane Power Compatibility: Supports 1.23–1.25 A at 5.1 VDC and 0.014 A at 24 VDC for reliable chassis communication.
  • Open-Style Enclosure: Enables installation in protected control cabinet environments.
  • Included Backup Battery: Ships with a 1756-BA1 battery for maintaining critical memory functions.
  • Industrial Operating Range: Functions from 0°C to 60°C to support standard automation environments.
  • Isolation Voltage Rating: Provides 30 V continuous isolation for controller protection.
  • Thermal Efficiency: Maintains low power dissipation levels at 5.6–5.7 W for improved system efficiency.
  • Shock and Vibration Compliance: Built to withstand industrial environmental conditions as defined by applicable IEC standards.

The 1756-L55 delivers the reliability and precision required for dependable control processing in industrial automation systems.

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