Allen-Bradley 1756-A7K 7-Slot ControlLogix Chassis Kit

Product Summary

The Allen-Bradley 1756-A7K is a 7-Slot ControlLogix Chassis Kit by Rockwell Automation. It provides a rugged backplane for mounting ControlLogix I/O modules, communication modules, and controllers with expanded capacity over the 4-slot version. The -K suffix denotes a kit configuration that includes the chassis, power supply, and mounting hardware for quick installation.

Core Specifications

• Model Number: 1756-A7K
• Type: 7-Slot ControlLogix Chassis Kit
• Slots: 7
• Backplane Current Capacity: 10 A at 5.1 VDC; 4 A at 24 VDC
• Backplane Power: 1.2 V backplane signaling
• Mounting: Panel or DIN rail (included)
• Dimensions: 171 mm (H) × 254 mm (W) × 118 mm (D)
• Weight: 1.5 kg (3.3 lbs)
• Manufacturer: Allen-Bradley by Rockwell Automation

Electrical & Functional Characteristics

• Backplane Design: High-speed parallel bus for deterministic I/O and controller communication
• Slot Independence: Any module can be installed in any slot — no dedicated slots required
• Keying System: Electronic keying prevents insertion of incompatible modules
• Status Indicators: Chassis OK LED for backplane health monitoring
• Grounding: Integrated chassis ground lug for safety and noise immunity

System Integration & Compatibility

• Compatible Controllers: 1756-L6x, 1756-L7x, 1756-L8x ControlLogix and GuardLogix controllers
• Compatible I/O: All 1756-series digital, analog, specialty, and safety I/O modules
• Compatible Power Supplies: 1756-PA72, 1756-PA75, 1756-PB72, 1756-PB75, 1756-PC75, 1756-PH75
• Communication Modules: 1756-EN2T, 1756-EN3TR, 1756-CN2R, 1756-DNB, 1756-EWEB
• Redundancy: Supports 1756-RM2 redundancy modules for paired chassis configurations
• Related Parts: 1756-A4K (4-slot kit), 1756-A10K (10-slot kit), 1756-A13K (13-slot kit), 1756-A17K (17-slot kit)

Environmental & Operational Limits

• Operating Temperature: 0°C to 60°C (32°F to 140°F)
• Storage Temperature: -40°C to +85°C (-40°F to 185°F)
• Humidity: 5% to 95% RH, non-condensing
• Vibration: 2G, 10 to 500 Hz
• Shock: 30G, 11 ms
• Approvals: CE, UL, CUL, ATEX (Zone 2), Marine

Industrial Applications

Widely deployed in medium-scale control systems, process skids, machine control centers, safety systems, and distributed control architectures where moderate I/O expansion and full ControlLogix compatibility are required.

Frequently Asked Questions

What is included in the 1756-A7K kit?

The -K suffix indicates a kit that typically includes the 7-slot chassis, mounting hardware, and sometimes a power supply. Verify exact kit contents with your supplier as configurations may vary.

What is the difference between 1756-A7 and 1756-A7K?

The 1756-A7 is the chassis only. The 1756-A7K is a kit configuration that includes additional mounting accessories and may include a power supply.

Can I use any slot for the controller?

Yes — ControlLogix chassis support any-slot placement. The controller or I/O module can be installed in any of the 7 slots.

What power supply do I need?

Standard AC power supplies: 1756-PA72 (120/240VAC) or 1756-PA75 (120/240VAC, redundant-capable). DC power supplies: 1756-PB72 (24VDC) or 1756-PB75 (24VDC, redundant-capable).

What are the related part numbers?

• 1756-A4K — 4-slot chassis kit
• 1756-A7K — 7-slot chassis kit (this part)
• 1756-A10K — 10-slot chassis kit
• 1756-A13K — 13-slot chassis kit
• 1756-A17K — 17-slot chassis kit