Allen-Bradley 1746-A7 7-slot Chassis SLC500 for I/O Modules

The Allen-Bradley 1746-A7 is a 7-slot chassis designed for use with the SLC 500 series of I/O modules. This chassis provides a reliable and compact structure for integrating various I/O modules, allowing for flexible configurations in industrial automation environments. With a high current capacity and robust environmental tolerance, the 1746-A7 chassis is ideal for demanding applications where modularity and scalability are critical.

Advantages:

• Supports up to 7 I/O modules for flexible system configuration
• Robust construction suitable for industrial environments
• High backplane current capacity for multiple module integration
• Easy mounting options for panel or DIN rail installation

General Info

• Manufacturer: Allen-Bradley
• Model Number: 1746-A7
• Type: 7-slot Chassis for SLC 500 I/O Modules
• Compatibility: SLC 500 series I/O modules
• Mounting Options: Panel or DIN rail
• Operating Temperature Range: 0°C to 60°C

Features

• 7 Slots for I/O Modules: The chassis features 7 slots that can accommodate SLC 500 I/O modules, providing a modular approach to expanding and customizing the control system to meet specific application requirements.

• High Backplane Current Capacity: The 1746-A7 chassis provides 5V DC at 16 A and 24V DC at 2 A, ensuring sufficient power distribution across all installed modules. This allows for reliable operation even in high-load scenarios.

• Compact and Versatile Design: The chassis has a compact footprint with dimensions of 290 mm (H) x 482 mm (W) x 139 mm (D), making it suitable for space-constrained installations. It also supports both panel and DIN rail mounting, offering flexibility during installation.

• Environmental Robustness: The chassis is designed to withstand challenging industrial environments, with an operating temperature range of 0°C to 60°C, and storage temperatures as low as -40°C and as high as 85°C. It also supports relative humidity from 5% to 95%, non-condensing.

• Vibration and Shock Resistance: The chassis is capable of withstanding 2 g of vibration at frequencies between 10-500 Hz, and shock levels of 30 g during operation, ensuring stability in environments with mechanical stress.

Technical Specifications

• Electrical Specifications:

  • Backplane Current Capacity:
    • 5V DC: 16 A
    • 24V DC: 2 A
  • Power Supply Loading: Compatible with SLC power supplies such as 1746-P1, P2, P3, P5, P6, P7, and P4

• Mechanical Specifications:

  • Slots: 7 slots for I/O modules
  • Dimensions:
    • Height: 290 mm (11.42 in)
    • Width: 482 mm (18.98 in)
    • Depth: 139 mm (5.47 in)
  • Weight: Approximately 4.5 kg (9.9 lbs)
  • Mounting Method: Panel mount or DIN rail
  • Mounting Hardware: Requires mounting tabs and #10 or #12 screws, with a torque requirement of 3.4 Nm (30 lb-in) maximum

• Environmental Specifications:

  • Operating Temperature Range: 0°C to 60°C (32°F to 140°F)
  • Storage Temperature Range: -40°C to 85°C (-40°F to 185°F)
  • Relative Humidity: 5% to 95% (non-condensing)
  • Vibration:
    • Operating: 2 g at 10-500 Hz (per IEC 60068-2-6)
  • Shock:
    • Operating: 30 g peak (per IEC 60068-2-27)
    • Non-operating: 50 g peak

• Protection Features:

  • Grounding Requirements: SLC 500 chassis require grounding connections to ensure safety. Older Series A chassis manufactured before November 1992 had a resistor between the logic ground and chassis ground, which could be damaged if not handled properly.

• Compliance and Certifications:

  • Certifications: UL Listed, CE Marked, CSA Certified
  • Safety Standards:
    • UL 508 (Industrial Control Equipment)
    • CSA C22.2 No. 142 (Process Control Equipment)
    • CE Compliance for Low Voltage Directive and EMC Directive
  • Power Supply Recommendations: Use a properly rated power supply for each chassis, with the selection based on system configuration to prevent overloading and ensure optimal performance.