The Allen-Bradley 1756-A17/B is a 17-slot chassis part of the ControlLogix programmable logic controller (PLC) system by Rockwell Automation. 

• Slots: 17 – This allows you to install various ControlLogix modules like processors, input/output (I/O) modules, and communication modules.
• Application: It houses the ControlLogix system and provides a backplane for high-speed communication and power distribution between the modules.
• Mounting: Designed for horizontal back-panel mounting within an enclosure.

1. About new and used product descriptions:

We guarantee that all products are 100% normal before shipment.
The new parts will use the original packaging.
Some second-hand products may have obvious scratches on the surface.
Second hand products will undergo strict testing before shipment.
Inventory will change periodically, please contact us before purchasing!

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