Product Overview: Allen-Bradley 1746-A4
The Allen-Bradley 1746-A4 is a 4-slot modular chassis specifically designed for the SLC 500™ programmable logic controller (PLC) platform. This chassis provides the fundamental structural and electrical backbone for a small-scale SLC system, housing the processor module, the power supply, and up to three additional I/O or communication modules. It is engineered to facilitate high-speed communication between modules via its integrated backplane, ensuring reliable data exchange in industrial automation environments.
Key Technical Specifications
- Number of Slots: 4 (1 for processor/power supply interface and 3 for I/O).
- Compatible Series: SLC 500 Modular Hardware.
- Mounting: Panel mount (backplate installation).
- Backplane Current (5V DC): 10A Max.
- Backplane Current (24V DC): 2.88A Max.
- Dimensions: 171 x 149 x 145 mm (approx. 6.73 x 5.87 x 5.71 in).
- Operational Temperature: 0°C to +60°C (32°F to 140°F).
Construction and Industrial Reliability
The 1746-A4 chassis is built with industrial-grade materials to provide EMI/RFI shielding, which is critical for maintaining signal integrity near high-voltage equipment. The modular slots feature a secure locking mechanism that prevents module vibration or accidental disconnection. Its compact footprint makes it an ideal choice for localized control panels where space is a premium but the reliability of the SLC 500 platform is required.
| Characteristic | Specification |
| Slot Capacity | 4 Full Slots |
| Weight | 0.73 kg (1.6 lbs) |
| Shock (Operating) | 30g |
Frequently Asked Questions
Can I expand this chassis? Yes, the 1746-A4 can be connected to other SLC chassis (A7, A10, A13) using interconnect cables like the 1746-C7 or 1746-C9 to increase your I/O count.
Do you need more references from this brand? Explore our full catalog of Allen-Bradley here.
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