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Phone: +86 16626708626Description
Key Technical Specifications
- Catalog Number: 1746-A13
- Manufacturer: Allen-Bradley
- Product Family: SLC 500
- Module Type: Modular chassis
- Number of Slots: 13
- Mounting Type: Panel mount
- Backplane Current: 10 A at 5.1 VDC
- Backplane Current: 2.88 A at 24 VDC
- Dimensions: 50.2 x 17.1 x 14.5 cm
- Weight: 1.9 kg
- Operating Temperature: 0 to 60 °C
- Storage Temperature: -40 to 85 °C
Product Introduction
The Allen-Bradley 1746-A13 is a 13-slot chassis for the SLC 500 PLC platform. It provides the backplane and mounting structure for the power supply, processor, communication modules, and I/O cards in a modular control rack.
This chassis is used when you need more slot capacity in an SLC 500 system. The 1746-A13 supports panel mounting, standard SLC 500 modules, and backplane distribution rated at 10 A on 5.1 VDC, so it fits expansion work in legacy Allen-Bradley installations.
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Module LEDs do not power up | No backplane power or failed power supply | ✅ High | Measure the chassis supply terminals and confirm the PSU output | Check the power supply before replacing the chassis |
| CPU does not seat or latch correctly | Bent slot guides or damaged backplane | ✅ High | Inspect slot alignment and physical damage | Replace the chassis if mechanical damage is present |
| Random module resets | Loose chassis grounding or poor supply stability | ✅ High | Check chassis ground continuity and supply ripple | Tighten ground and verify PSU health |
| One slot not recognized | Damaged backplane connector in that slot | ✅ High | Move the module to another slot and retest | If the fault stays with the slot, the chassis is suspect |
| System runs hot | Poor cabinet airflow or blocked clearances | ⚠️ Medium | Measure cabinet temperature and inspect clearances | Restore clearance and airflow before blaming the chassis |
| Expansion modules fail after install | Wrong rack type or incompatible module placement | ⚠️ Medium | Verify SLC 500 module compatibility and slot assignment | Confirm the exact chassis type and layout |
If you are stuck, send photos of the rack, PSU, slot damage, and module layout to technical support.
1746-A13
Frequently Asked Questions
Q: What is the 1746-A13?
It is a 13-slot Allen-Bradley SLC 500 chassis for holding the power supply, CPU, and I/O modules.
Q: Is this a controller or just a rack?
It is just the chassis. The CPU and I/O cards are separate modules that mount into it.
Q: How many modules can it hold?
It has 13 slots total. One slot is typically used for the power supply, and the rest are used for the controller and I/O.
Q: Can I mount it on a panel?
Yes. The 1746-A13 is a panel-mount chassis.
Q: Is it still current production?
No, this is a legacy SLC 500 part, so most supply comes from surplus or refurbished inventory.
Q: What should I check before replacement?
Verify the exact chassis size, slot count, power supply fit, and grounding. On old SLC racks, a bad supply or grounding issue is often mistaken for a bad chassis.
