Purchase now: Allen-Bradley 1756-A10 ControlLogix Chassis
Purchase now: Atlantechdrives provides you the 1756-A10, a rugged, industrial-grade 10-slot chassis meticulously engineered by Rockwell Automation to serve as the physical and electrical foundation of the powerful ControlLogix 1756 programmable automation controller (PAC) platform. Far more than just a simple metal box, the 1756-A10 houses a highly sophisticated, high-speed multi-layer printed circuit board (the backplane) that facilitates ultra-fast data transfer and power distribution between the main CPU, communication bridges, and local I/O modules. The 10-slot form factor is widely considered the «sweet spot» in industrial control cabinet design, offering ample room for a massive processor, multiple EtherNet/IP or ControlNet bridge cards, and a robust array of digital and analog I/O, without demanding the excessive wall space required by the larger 13-slot or 17-slot chassis. Constructed from heavy-duty extruded aluminum, it provides phenomenal structural rigidity and superior electromagnetic interference (EMI) shielding, making it the bedrock of reliable automation in heavy automotive plants, steel mills, and sprawling food processing facilities.
Technical Specifications of the 1756-A10
The 1756-A10 features exactly 10 usable module slots, numbered from 0 to 9. The power supply mounts on an independent extended rail on the far-left side of the chassis, meaning the power supply does not consume one of the 10 available module slots.
- Part Number: 1756-A10
- Platform: ControlLogix 1756 System
- Number of Available Slots: 10
- Mounting Type: Back-panel surface mount (horizontal orientation only)
- Backplane Current Capacity (1.2V DC): 1.5 A
- Backplane Current Capacity (3.3V DC): 4 A
- Backplane Current Capacity (5.1V DC): 15 A
- Backplane Current Capacity (24V DC): 2.8 A
Expert Tips: The Absolute Necessity of Centralized Grounding
The 1756-A10 chassis is the central electrical reference point for the entire PLC architecture, meaning proper grounding is absolutely vital for system stability. Expert Tip: High-speed data networks like EtherNet/IP and sensitive analog inputs are extremely susceptible to high-frequency electrical noise (EMI/RFI) generated by Variable Frequency Drives (VFDs) and large contactors inside the cabinet. You must never rely on the four mounting bolts touching the painted backplate of your electrical panel to ground the chassis. You must install a dedicated, heavy-gauge solid copper wire (typically 8 AWG) from the specific grounding lug provided on the left side of the 1756-A10 directly to the central ground bus bar of the enclosure. A poorly grounded chassis acts as a giant antenna, capturing electromagnetic noise and inducing fatal communication faults across the backplane.
Installation Advice: Thermal Convection and Slot Fillers
Rockwell Automation strictly dictates that the 1756-A10 chassis must be mounted horizontally. The entire ControlLogix architecture relies entirely on passive thermal convection—heat naturally rising—to cool the delicate microprocessors inside the modules. If you mount the chassis vertically, the immense heat generated by the lower modules will wash directly over the upper modules, causing rapid thermal failure. Furthermore, if your system only utilizes 7 out of the 10 available slots, you must install 1756-N2 blank slot filler modules in the 3 empty positions. Leaving slots physically open disrupts the carefully engineered airflow chimney effect, starving the active modules of cooling air, while also allowing conductive factory dust to settle directly onto the exposed gold-plated backplane pins.
Frequently Asked Questions (FAQs)
Q: Can I plug a 120V AC power supply (like the 1756-PA72) into the 1756-A10 chassis?
A: Yes. The 1756-A10 chassis is universally compatible with all standard ControlLogix power supplies, whether they are 120/240V AC (PA series) or 24V DC (PB series). The chassis backplane simply accepts the regulated DC voltage provided by whichever power supply you attach to the left-hand slot.
Q: Does it matter which slot I put the processor (CPU) in?
A: From a strict hardware perspective, no. ControlLogix processors and I/O modules can be placed in any of the 10 slots. However, standard engineering best practice dictates placing the main controller in Slot 0 (the far left slot) to standardize panel design and make troubleshooting easier for maintenance technicians.
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This 10-slot ControlLogix chassis serves as a robust modular base; ensure your configuration includes a high-capacity 1756-PA75 power supply.
