Description
Note: Many products are not yet listed. Please contact us for more product information. Our supply channels are constantly expanding, and we currently have 20 stable shared supply channels. Please confirm the model, product, price, and all other necessary information with customer service before placing an order. We offer new, refurbished, and used products, and prices are adjusted according to the year of the item you require.
3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Catalog Number | 1756-A17/B |
| Product Type | ControlLogix Standard Chassis |
| Number ofSlots | 17 |
| Series | B |
| Backplane Current @ 1.2 V DC | 1.5 A (chassis max) |
| Backplane Current @ 3.3 V DC | 4 A / 4 A (chassis/slot) |
| Backplane Current @ 5.1 V DC | 15 A / 6 A (chassis/slot) |
| Backplane Current @ 24 V DC | 2.8 A / 2.8 A (chassis/slot) |
| Power Dissipation, max | 6 W |
| Mounting | Horizontal panel mount only |
| Weight, approx. | 2.20 kg (4.8 lb) |
| Enclosure Type | Open-style |
4. Product Introduction (Anti-Template)
The Allen-Bradley 1756-A17/B is a 17-slot ControlLogix standard chassis designed to house ControlLogix controllers, I/O modules, communication modules, and specialty modules. It provides the mechanical structure and backplane that distribute power and data between installed modules.
Series B chassis support the full range of standard ControlLogix power supplies (such as 1756-PA75 and 1756-PB75) mounted on the left side. The chassis is intended for horizontal panel mounting inside an enclosure and requires adequate clearance for ventilation and cable access. It is an open-style design with no enclosure rating of its own. The 1756-A17/B is widely used in medium-to-large ControlLogix systems that need higher module density than the smaller 4-, 7-, 10-, or 13-slot chassis.
1756-A17/B
1756-A17/B
1756-A17/B
5. QC, Procurement & Logistics SOP
- Inbound Verification – Confirm catalog number (1756-A17/B), series letter, mounting tab condition, and backplane connector integrity. Photograph all labels.
- Visual Inspection – Check for bent pins, damaged slots, or corrosion on the backplane. Verify all mounting hardware is present.
- QA & Packaging – Protect the backplane connectors and mounting surfaces; clean the chassis; pack in protective packaging that prevents flexing or impact damage.
- Global Logistics & Export Compliance – Classify under the correct HS code for industrial control chassis. Packaging must protect the backplane and mounting tabs; export documentation is prepared to minimize customs delays.
6. Technical Pitfalls & Integration Warnings
Power Supply Compatibility – Use only approved 1756 series power supplies. Incorrect or undersized supplies will limit the number of modules that can be installed.
Slot Power Budget – Calculate the total current draw of all modules at each voltage rail. The chassis limits (especially 15 A at 5.1 V) must not be exceeded.
Mounting Orientation – The chassis must be mounted horizontally. Vertical mounting is not supported and can cause thermal or mechanical issues.
Clearance Requirements – Maintain manufacturer-recommended clearances around the chassis for airflow and cable routing. Insufficient space can lead to overheating or difficult maintenance.
7. Frequently Asked Questions (FAQ)
What is the realistic global lead time for a verified 1756-A17/B?
As a common ControlLogix chassis, availability is generally good. Typical lead time after verification is 3–10 business days plus standard shipping.
How many slots does the 1756-A17/B have?
17 slots.
What series is this chassis?
Series B.
What power supplies are compatible?
Standard ControlLogix supplies such as 1756-PA75, 1756-PB75, and their redundant counterparts.
Can it be mounted vertically?
No. Horizontal panel mounting only.
Is the 1756-A17 still in production?
Yes. The ControlLogix chassis family remains active, although newer systems may use different form factors or the 5580/5500 platforms for new designs.
What should be confirmed before ordering a replacement?
Exact catalog number and series (1756-A17/B), required power supply type, total module current budget, and available panel space for horizontal mounting.
