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Description

The Allen-Bradley 1756-A4 is a compact 4-slot chassis designed for the ControlLogix automation system. This backplane provides the physical mounting and electrical communication interface for ControlLogix modules, including processors, I/O modules, and communication adapters. It serves as the backbone for small-scale control applications, enabling seamless integration of distributed control components within a single, robust enclosure.

Features

  • Supports up to 4 ControlLogix modules in a single horizontal configuration.
  • Optimized for high-speed data exchange via the ControlLogix backplane.
  • Robust mechanical construction for industrial control panel mounting.
  • Standardized slot spacing for easy module insertion and removal.
  • Compatible with a wide range of 1756 series I/O, motion, and controller modules.

Technical Specifications

Catalog Number 1756-A4
Number of Slots 4
Mounting Type Horizontal
Backplane Current (5V DC) 10 Amps
Backplane Current (24V DC) 2.8 Amps
Power Dissipation (Max) 4 Watts
Enclosure Type Open

Installation Guidelines

  • Ensure the chassis is mounted on a flat, rigid surface within an appropriate industrial enclosure to protect against environmental contaminants.
  • Maintain adequate clearance around the chassis to facilitate proper airflow and prevent overheating of the installed modules.
  • Verify that the chassis is properly grounded to the enclosure backplane to minimize electromagnetic interference (EMI).
  • Always power down the system before installing or removing modules from the chassis slots to prevent electrical damage.
  • Use caution when handling components to avoid electrostatic discharge (ESD) damage to sensitive backplane circuitry.

FAQ

Is the 1756-A4 compatible with all ControlLogix modules?

Yes, the 1756-A4 is designed to house any standard 1756 ControlLogix module, including processors, communication modules, and I/O cards, provided the total power consumption does not exceed the backplane's current capacity.

Can this chassis be mounted vertically?

The 1756-A4 is primarily designed for horizontal mounting. Consult the official Allen-Bradley installation manual for your specific series if vertical orientation is required, as derating or specific cooling requirements may apply.

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