The Allen-Bradley 1746-A2 is a compact, 2-slot modular chassis designed for the SLC 500 control system. Engineered for flexibility, it serves as an ideal solution for small-scale I/O expansion or as a remote rack when configured with an appropriate adapter module. Despite its minimal footprint, the chassis provides robust backplane communication and reliable power distribution for standard SLC 500 hardware.
Features
Slot Configuration: Provides 2 slots, with Slot 0 reserved for the processor or I/O adapter module.
System Scalability: Supports daisy-chaining with up to two additional chassis using standard interconnect cables, allowing for a total system capacity of 30 slots.
Robust Power Handling: Rated for up to 10A at 5.1V DC and 2.88A at 24V DC on the backplane.
Versatile Mounting: Designed for standard back-panel installation within industrial enclosures.
Applications
This chassis is widely utilized in industrial automation environments requiring localized I/O expansion. It is frequently integrated into distributed control architectures, serving as a remote I/O station via Remote I/O (RIO) or ControlNet adapters, or as a secondary local rack for specialized I/O modules.
Technical Specifications
Brand
Allen-Bradley
Series
SLC 500
Slot Capacity
2
Max Backplane Current (5.1V DC)
10 Amps
Max Backplane Current (24V DC)
2.88 Amps
Mounting
Panel Mount
Operating Temperature
0 to 60 degC
Storage Temperature
-40 to 85 degC
Relative Humidity
5 to 95% (Non-condensing)
Installation Guidelines
Panel Mounting: Securely mount the chassis to a grounded metal sub-panel to ensure proper electrical bonding and heat dissipation.
Grounding: Always connect the chassis frame ground terminal to a low-impedance earth ground to mitigate EMI and electrical noise.
Module Insertion: Ensure the power is disconnected from the backplane before installing or removing any I/O modules to prevent electrical arcing or damage to the backplane pins.
Environment: Install in an enclosure rated for the intended environment, maintaining adequate clearance for cooling airflow as specified by the system design requirements.
FAQ
Can I use this chassis as a standalone processor rack? Yes, the 1746-A2 can house an SLC 500 processor in Slot 0, allowing it to function as a small, independent controller rack.
What is the maximum number of chassis I can connect together? You can connect a total of three chassis in a single local system using the appropriate interconnect cables.
