PRODUCT INFORMATION
Product Overview
Revision scope: These specifications describe 1756-A7/B (Series B). Check the corresponding technical data before specifying another hardware series.
The Allen-Bradley 1756-A7 is a seven-slot ControlLogix chassis designed for modular industrial automation systems. It provides physical housing and electrical connections for ControlLogix controllers, I/O modules, and network communication adapters. The high-speed backplane distributes DC operating power and routes inter-module control communications across all seven available slots.
Engineered for horizontal panel mounting, this Series B chassis features an open-style enclosure requiring an external cabinet. The assembly supports standard and redundant ControlLogix power supplies mounted directly on the left side. Modules can be inserted into any available slot position without slot-dependent architecture restrictions.
TECHNICAL DATA
Technical Specifications
These specifications describe 1756-A7/B (Series B). Check the corresponding technical data before specifying another hardware series.
| Parameter | Specification |
|---|
| Number of Slots | 7 |
|---|
| Mounting Orientation | Horizontal back-panel only |
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| Backplane Current at 1.2V DC | 1.5 A maximum (chassis total) |
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| Backplane Current at 3.3V DC | 4 A chassis max / 4 A per slot max |
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| Backplane Current at 5.1V DC | 15 A chassis max / 6 A per slot max |
|---|
| Backplane Current at 24V DC | 2.8 A chassis max / 2.8 A per slot max |
|---|
| Maximum Power Dissipation | 4.5 W |
|---|
| Operating Temperature | 0 to 60 °C (32 to 140 °F) |
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| Nonoperating Temperature | -40 to 85 °C (-40 to 185 °F) |
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| Operating Relative Humidity | 5% to 95% noncondensing |
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| Operating Shock | 30 g |
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| Nonoperating Shock | 50 g |
|---|
| Operating Vibration | 2 g at 10 to 500 Hz |
|---|
| Enclosure Type Rating | None (open-style) |
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| North American Temperature Code | T5 |
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| IEC Temperature Code | T5 |
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| Minimum Cabinet Dimensions (H x W x D) | 50.8 x 61.0 x 20.3 cm (20 x 24 x 8 in.) |
|---|
| Functional Earth Ground Wire | 8.3 mm² (8 AWG) solid or stranded copper rated >= 90 °C |
|---|
| Protective Earth Ground Wire | 2.1 mm² (14 AWG) solid or stranded copper rated >= 90 °C |
|---|
TECHNICAL INFORMATION
Order Information
| Revision Part # | Also known as | Reference Price |
|---|
| 1756-A7 Ser B | 1756-A7/B, Series B | USD 389.00, indicative (Used/Refurbished) |
Reference prices are observed third-party market prices for the stated revision, not a final Aituos quotation.
TECHNICAL INFORMATION
Features
- Provides seven module slots for flexible controller and I/O layout configurations.
- Delivers high-speed backplane data communication paths across all installed hardware.
- Distributes multiple DC voltage buses directly to inserted ControlLogix modules.
- Designed specifically for horizontal back-panel installation inside industrial enclosures.
- Compatible with standard Series B ControlLogix power supply options.
TECHNICAL INFORMATION
Applications
- Centralized and distributed ControlLogix programmable automation controller assemblies.
- Remote I/O rack installations communicating via EtherNet/IP or ControlNet networks.
- Factory automation systems requiring seven-slot modular hardware consolidation.
TECHNICAL INFORMATION
Connections / Interfaces
- Seven card-edge backplane connectors for module data and power routing.
- Integrated power supply connection interface on the left chassis edge.
- Dedicated chassis grounding terminals for functional and protective earth connections.
TECHNICAL INFORMATION
Installation Guidelines
- Mount the chassis in a horizontal orientation on an enclosure back panel.
- Ensure adequate spacing to maintain surrounding ambient air temperature below 60 °C.
- Connect functional earth using 8.3 mm² (8 AWG) copper wire rated at 90 °C minimum.
- Connect protective earth using 2.1 mm² (14 AWG) copper wire rated at 90 °C minimum.
TECHNICAL INFORMATION
Configuration Guidelines
- Place any compatible ControlLogix module into any available backplane slot.
- Calculate total module current demands against backplane bus ratings before commissioning.
- Install the designated ControlLogix power supply on the left chassis mount.
TECHNICAL INFORMATION
Compatibility
- Compatible with Allen-Bradley ControlLogix standard controllers and communication interfaces.
- Compatible with 1756 series discrete, analog, and specialty I/O modules.
- Supports Series B standard and slim ControlLogix chassis power supplies.
TECHNICAL INFORMATION
Lifecycle / Replacement Information
- Series B hardware designation reflects specific manufacturing revisions within the 1756-A7 product line.
- Verify system hardware series requirements before swapping chassis units in hazardous locations.
TECHNICAL INFORMATION
Compliance and Certifications
- c-UL-us Listed Industrial Control Equipment (UL File E65584)
- c-UL-us Listed for Class I Division 2 Groups A, B, C, D Hazardous Locations
- FM Approved for Class I Division 2 Groups A, B, C, D
- CE Compliant (EN 61326-1, EN 61000-6-2, EN 61000-6-4, EN 61131-2)
- ATEX II 3 G Ex nA IIC T4 Gc X (European Union Directive 94/9/EC)
- RCM, UKCA, KC, CCC
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSCompatible with Allen-Bradley ControlLogix standard controllers and communication interfaces. Compatible with 1756 series discrete, analog, and specialty I/O modules. Supports Series B standard and slim ControlLogix chassis power supplies.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
What is the slot capacity of the Allen-Bradley 1756-A7/B chassis?
The 1756-A7/B chassis provides seven physical module slots for ControlLogix controllers, communication adapters, and I/O modules.
Does the 1756-A7/B power supply occupy one of the seven module slots?
No, the power supply mounts to the left of the backplane slots and does not occupy a module slot.
What is the reference price for an Allen-Bradley 1756-A7/B chassis?
Market observations show an indicative reference price of approximately $389 USD for refurbished units. Pricing figures are indicative market reference pricing only and are not a final quotation.
What mounting orientation is supported for the 1756-A7/B chassis?
Rockwell Automation technical documentation specifies horizontal back-panel mounting only for the 1756-A7/B chassis.
