The Allen-Bradley 1756-A10 is a ControlLogix 10-slot chassis from the ControlLogix series, designed as the physical backplane base for assembling ControlLogix processors, I/O modules, and communication adapters. This open-style chassis provides a high-speed communication path between modules and distributes power to each module within the chassis. It supports flexible configuration for medium-to-large-scale industrial automation systems and is currently in Active production by Rockwell Automation.

We supply the 1756-A10 chassis in new surplus and refurbished condition. Every unit undergoes full hardware and backplane function testing before shipment, reducing failure risk for your automation maintenance or system rebuild projects.

1756-A10 Specifications

Source: Rockwell Automation Publication 1756-TD006F-EN-E (March 2017) and official product page at rockwellautomation.com.

What Is the 1756-A10 Used For?

The 1756-A10 chassis serves as the structural and electrical foundation of a ControlLogix automation system. It houses the processor module (CPU), I/O modules, communication adapters, and power supply in a single integrated rack. The backplane inside the chassis provides the high-speed data path between all installed modules and distributes power from the power supply to each slot.

Common applications include:

• Assembly production lines — coordinating sequential control, part presence sensing, and reject handling
• Material-handling equipment — conveyor routing, sortation, and accumulation control
• Chemical processing plants — batch process control, safety interlocking, and analog signal monitoring
• Manufacturing workshop control systems — machine-level logic, data collection, and PLC-to-SCADA integration

With 10 slots, this chassis is suited for medium-to-large applications where the control system requires a processor, multiple I/O modules, and dedicated communication interfaces in a single rack.

Key Features

• 10-slot modular capacity — accepts any 1756 ControlLogix processor, I/O, or communication module in any slot, enabling flexible system design.
• High-speed backplane — provides a dedicated communication path between modules with power distribution at 1.2V, 3.3V, 5.1V, and 24V DC levels.
• Natural convection cooling — no fans required, reducing maintenance points and failure risk in industrial environments.
• Horizontal panel mounting — designed for back-panel installation inside an industrial enclosure; the only supported orientation per Rockwell specifications.
• Open-style design — requires installation within a suitable industrial enclosure; not rated for standalone or exposed-environment use.
• Active lifecycle status — currently in production by Rockwell Automation with manufacturer warranty support and parts availability.

Compatibility and Replacement Considerations

The 1756-A10 chassis is compatible with all standard 1756 ControlLogix processors, digital and analog I/O modules, and communication adapters. Any 1756 module can be placed in any slot. However, proper system design requires verifying the total backplane current budget against the power supply capacity.

Before Replacing or Expanding a Chassis, Verify:

• Part number — confirm the full catalog number is 1756-A10 (not 1756-A10K, 1756-A10XT, or 1756-A10ZXT, which are different variants).
• Series (B or C) — Series C offers improved slot guidelines, ventilation, and mounting tabs. The operating temperature range differs between series.
• Slot count — 10 slots. If your existing rack has a different slot count, the chassis is not a drop-in physical replacement.
• Backplane current budget — verify the installed power supply (e.g., 1756-PA72, 1756-PB72, 1756-PA75, 1756-PB75) can support the total current draw of all installed modules.
• Enclosure dimensions — minimum enclosure size for the 1756-A10 is 50.8 × 76.2 × 20.3 cm (20 × 30 × 8 in.). Confirm your cabinet can accommodate it.
• Mounting orientation — the chassis supports horizontal mounting only. Vertical installation is not supported and may cause thermal or operational issues.

Do not assume visually similar models are interchangeable. The 1756-A10XT is an extreme-temperature variant with conformal coating, different enclosure requirements, and a different operating temperature range (-25 to +70°C). Confirm the complete part number and technical configuration before replacement.

How to Confirm the Correct Product Before Ordering

To avoid receiving the wrong chassis or an incompatible variant, verify the following before placing your order:

• Full part number on the nameplate — read the catalog number directly from the existing chassis nameplate. Look for “1756-A10” with a series suffix (/B or /C) if present.
• Series letter — check whether the nameplate shows Series B or Series C. This affects the temperature range and mounting hardware.
• Slot count — count the physical slots on the existing chassis. The 1756-A10 has exactly 10 slots.
• Power supply model — note the installed power supply model (1756-PA72, 1756-PB72, 1756-PA75, 1756-PB75, or redundant pair). The power supply must match the chassis voltage class.
• Enclosure clearance — measure the available space in your control cabinet. Include clearance for cable routing (minimum 12.7 cm / 5.0 in. on the left side for the 1756-CPR2 cable).
• Condition preference — confirm whether you need a new surplus unit or a refurbished unit. Both are tested before shipment.

Frequently Asked Questions

How many slots does the 1756-A10 chassis have?

The 1756-A10 has 10 slots, numbered 0 through 9. Any 1756 ControlLogix module (processor, I/O, or communication) can be installed in any slot.

Can the 1756-A10 be mounted vertically?

No. The 1756-A10 chassis is designed for horizontal back-panel mounting only. Vertical mounting is not supported by Rockwell Automation and may result in thermal issues or unreliable operation.

What is the difference between the 1756-A10 and the 1756-A10XT?

The 1756-A10 is the standard ControlLogix chassis rated for 0–60°C (Series B) or -25 to +60°C (Series C). The 1756-A10XT is the ControlLogix-XT variant designed for extreme temperature environments (-25 to +70°C), with conformal coating for increased survivability in ISA G3 environments. They are not interchangeable without verifying application requirements.

What power supplies are compatible with the 1756-A10?

The 1756-A10 is compatible with standard ControlLogix power supplies including the 1756-PA72 (120V AC), 1756-PB72 (240V DC), 1756-PA75 (120V AC), and 1756-PB75 (240V DC). Redundant power supply configurations are also supported. Always verify the total backplane current draw of installed modules against the power supply rating.

What is the backplane current capacity of the 1756-A10?

The 1756-A10 backplane supports a maximum of 15 A at 5.1V DC for the entire chassis, with a maximum of 6 A per individual slot. Additional current limits apply at 1.2V DC (1.5 A chassis), 3.3V DC (4 A chassis / 4 A per slot), and 24V DC (2.8 A chassis / 2.8 A per slot).

Is the 1756-A10 still in production?

Yes. As of the latest Rockwell Automation product page, the 1756-A10 has an Active lifecycle status with an estimated lead time of 5 days and a standard 1-year manufacturer warranty.

Does the 1756-A10 come with a power supply included?

No. The 1756-A10 is the chassis (backplane) only. The power supply (e.g., 1756-PA72, 1756-PB75) must be ordered separately unless purchased as part of a pre-configured kit.

Get Your 1756-A10 Chassis Today

The Allen-Bradley 1756-A10 ControlLogix 10-slot chassis is available in new surplus and refurbished condition. Every unit is fully tested before shipment. Use the “Add to Cart” button above to order, or click “One Click Quote” for a fast quote on bulk orders or specific series requirements.

Looking for other ControlLogix chassis sizes? See our ControlLogix chassis selection.

Micro800 family (programmed with Connected Components Workbench, all-in-one)

Micro810: 2080-LC10-12AWA / 12QWB / 12DWD … (fixed 12 I/O, no expansion)
• Micro820: 2080-LC20-20AWB / 20QBB / 20QWB … (20 I/O, 2 plug-in modules, on-board Ethernet & SD)
• Micro830: 2080-LC30-10/16/24/48*** (10-48 I/O, up to 5 plug-ins)
• Micro850: 2080-LC50-24/48*** (24-48 I/O, 4 additional 2085 I/O modules, Ethernet)
• Micro870: 2080-LC70-*** (up to 304 local I/O, 8 plug-ins, supports Kinetix 5100 / PF 520 motion)
Example: 2080-LC50-48QWB = 48-point transistor, Ethernet included.

CompactLogix mid-range (Studio 5000 software, 1769 / 5069 platform)

5370 series (1769, still available but being migrated to 5380)
1769-L16ER-BB1B, L18ER-BB1B, L24ER-QB1B, L27ERM-QB1B, L30ER, L33ER, L36ERM …
“M” suffix = integrated motion port for servo control.
• 5380 series (5069, current mainstream, 2× speed & memory)
5069-L306ER, L310ER, L320ER, L330ER, L340ER, L350ERM, L380ERM, L3100ERM …
• 5480 series (5069, Windows 10 IoT edge compute)
5069-L4x0ERMW, L4x0ERM …
Note: 1768 platform (1768-L43/L45/S) was discontinued Jun-2020; use 5380 instead.

ControlLogix high-end (1756 platform, redundancy & safety)

• 5570: 1756-L61/62/63/71/72/73/75 (2 MB–32 MB memory)
• 5580: 1756-L81E, L82E, L83E, L84E, L85E (3 MB–40 MB, 10× scan speed)
• GuardLogix safety: 1756-L6xS / L8xS (dual-core safety, SIL3 / PL e)
• Redundancy: 1756-RM2/A paired with any L7x or L8x.