1756-A5XT | AB Allen-Bradley 5-Slot ControlLogix-XT Chassis

Product Summary

The Allen-Bradley 1756-A5XT is a 5-Slot ControlLogix-XT Chassis by Rockwell Automation, designed for operation in extreme temperature environments from -25°C to +70°C. It features conformal coating on the backplane for enhanced protection against moisture, dust, and chemical contaminants in harsh industrial environments (ISA G3 rated). The chassis provides a high-speed communication path between modules and distributes power to each slot, with any ControlLogix module installable in any slot.

Core Specifications

• Model Number: 1756-A5XT
• Type: 5-Slot ControlLogix-XT Chassis
• Slots: 5
• Mounting: Horizontal
• Backplane Current, Slot Max @ 1.2V DC: 1.5 A
• Backplane Current, Slot Max @ 3.3V DC: 4 A
• Backplane Current, Slot Max @ 5.1V DC: 15 A
• Backplane Current, Slot Max @ 24V DC: 4 A
• Power Dissipation: 6.1 BTU/hr
• Power Consumption: 1.8 W
• Weight: 1.45 kg (3.2 lb)
• 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 ControlLogix module can be installed in any slot — no dedicated slots required
• Conformal Coating: Protects backplane circuitry from moisture, dust, and corrosive gases (ISA G3 compliant)
• Keying System: Electronic keying prevents insertion of incompatible modules
• Slot Fillers: 1756-N2XT required for empty slots to maintain proper airflow and EMC shielding

System Integration & Compatibility

• Compatible Controllers: 1756-L6x, 1756-L7x, 1756-L8x ControlLogix and GuardLogix controllers (XT-rated recommended)
• Compatible I/O: All 1756-series XT-rated and standard I/O modules
• Compatible Power Supplies: 1756-PBXT (XT-rated DC power supply), 1756-PA75XT, 1756-PB75XT
• Communication Modules: 1756-DHRIOXT, 1756-EN2TXT, 1756-CN2RXT (XT-rated variants)
• Related Parts: 1756-A4LXT (4-slot XT), 1756-A7XT (7-slot XT), 1756-A7LXT (7-slot XT low-profile), 1756-N2XT (slot filler)

Environmental & Operational Limits

• Operating Temperature: -25°C to +70°C (-13°F to 158°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 operating; 50G non-operating
• Contaminant Rating: ISA G3 (conformal coated for harsh environments)
• Approvals: CE, UL, CUL, ATEX (Zone 2 with certified enclosure), Marine

Industrial Applications

Widely deployed in oil & gas wellhead controls, pipeline pumping stations, outdoor water/wastewater treatment, mining operations, cold storage facilities, desert solar farms, steel mills, and any application where ambient temperatures exceed standard 0–60°C chassis ratings or where corrosive atmospheres are present.

Frequently Asked Questions

What is the difference between 1756-A5 and 1756-A5XT?

The 1756-A5 is a standard 5-slot chassis rated for 0°C to 60°C. The 1756-A5XT is an Xtreme Temperature variant rated for -25°C to +70°C with conformal coating for ISA G3 harsh environments.

Can I use standard I/O modules in the 1756-A5XT?

Yes — standard 1756-series modules are physically compatible. However, for full system reliability in extreme temperatures, XT-rated modules (e.g., 1756-IB16XT) are recommended to match the chassis operating range.

What power supply do I need?

Use XT-rated power supplies such as 1756-PBXT (24VDC), 1756-PA75XT, or 1756-PB75XT to ensure the entire chassis assembly operates within the extended temperature range.

Do I need slot fillers for empty slots?

Yes — use 1756-N2XT slot filler modules for any empty slots to maintain proper airflow, prevent debris ingress, and preserve EMC shielding integrity.

What are the related part numbers?

• 1756-A4LXT — 4-slot XT chassis (low-profile)
• 1756-A5XT — 5-slot XT chassis (this part)
• 1756-A7XT — 7-slot XT chassis
• 1756-A7LXT — 7-slot XT chassis (low-profile)
• 1756-N2XT — XT slot filler module
• 1756-PBXT — XT 24VDC power supply