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| Parameter | Specification |
| Catalog Number | 1746-A10 |
| Brand | Allen-Bradley / Rockwell Automation |
| Module Type | SLC 500 Modular Hardware Chassis |
| Total Slots | 10 Slots (Slot 0 reserved for CPU/Adapter; Slots 1–9 for I/O) |
| Backplane Current (5 V DC) | 10.0 A Maximum |
| Backplane Current (24 V DC) | 2.88 A Maximum |
| Mounting Options | Panel Mount (Backplate) |
| Interconnect Port | Left/Right interconnect sockets for expansion cables (1746-C9, 1746-C7) |
| Dimensions (W x H x D) | 437 x 147 x 140 mm (17.2 x 5.8 x 5.5 in) |
| Operating Temperature | 0 to +60 °C (+32 to +140 °F) |
The Allen-Bradley 1746-A10 is a 10-slot modular backplane chassis engineered for the SLC 500 control platform. It houses the power supply, CPU or I/O adapter module in Slot 0, and up to 9 expansion I/O or specialty communication modules across backplane slots 1 through 9.
Securing this hardware as New Surplus guarantees critical backplane connector integrity and prevents unexpected system halts caused by worn backplane pins or hairline trace cracks. It provides a reliable drop-in chassis replacement without requiring a costly and premature full PLC migration to CompactLogix.
1746-A10
1746-A10
1.Pre-Installation (Prep & Safety):
Isolate all high-voltage field wiring and disconnect main 120/240 V AC power from the chassis power supply (e.g., 1746-P1, P2, or P4) using Lock-Out/Tag-Out (LOTO) protocols. Wear a grounded ESD wrist strap. Label all field wiring arms (1746-RTB) and take detailed reference photographs of module positions and expansion interconnect cable routing before touching any hardware.
2.Module Removal:
Unscrew and remove the terminal blocks from each installed I/O module. Squeeze the top and bottom release tabs on each I/O module and slide them straight out of the slots. Remove the power supply mounting screws on the far left and lift the power supply clear of the 1746-A10 frame. Disconnect any 1746-C13 or 1746-C7 chassis interconnect cables attached to the side ports.
3.Chassis Replacement & Mounting:
Unbolt the four corner mounting screws securing the old 1746-A10 chassis to the panel backplate. Mount the new 1746-A10 chassis in its place, tightening mounting hardware securely to ensure proper earth grounding through the chassis metal frame. Reconnect any multi-chassis ribbon expansion cables to the left or right side ports until they lock firmly into place.
4.Reassembly & System Power-On:
Reinstall the power supply on the left side of the chassis, securing its retainers. Slide the CPU into Slot 0 and all I/O modules into their designated slots (Slots 1–9) until the top and bottom clips click into place. Reattach all pre-wired terminal blocks. Reapply main power and verify that the power supply LED lights up green and the CPU passes its initial self-test.
- System Compatibility: The 1746-A10 chassis is compatible with all SLC 500 modular processors (SLC 5/01, 5/02, 5/03, 5/04, and 5/05) as well as 1747-ASB remote I/O adapters.
- Backplane Power Limitations: Ensure the total combined current consumption of all installed modules does not exceed the power supply output rating or the maximum backplane current capacity of 10.0 A at 5 V DC.
- Hot-Swapping Danger: The 1746 SLC 500 architecture does not support RIUP (Removal and Insertion Under Power). Inserting or pulling any module while the chassis power supply is energized will cause backplane damage, CPU faults, or permanent hardware failure.
How do you guarantee this 1746-A10 chassis is genuine New Surplus and not pulled from an old plant?
This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability. We inspect backplane gold-pin connectors for zero insertion wear, verify clean plastic slot rails, and check factory production labels to ensure maximum operational life.
Why is this chassis listed at a higher price than used items on auction sites?
Our pricing reflects the cost of securing genuine New Surplus inventory globally. It may be 20-30% higher than a refurbished gamble, but it is substantially less than OEM list prices, and it buys you 100% peace of mind. Buying a second-hand chassis risks dirty backplane contacts, hair-line trace fractures, and bent pins that cause intermittent bus faults during production runs.
Since the SLC 500 line is mature, why should I keep a 1746-A10 on-site as buffer stock?
Because thousands of legacy plants rely on SLC 5/04 and 5/05 controllers, a cracked chassis frame or damaged backplane port can freeze an entire production line. Keeping 1 unit as an on-site insurance policy prevents thousands of dollars per hour in unplanned downtime while you plan a scheduled migration strategy.
Can I connect multiple 1746-A10 chassis together to expand my slot capacity?
Yes. You can connect up to 3 SLC 500 chassis together using 1746 expansion interconnect cables (such as the 1746-C7 or 1746-C9). A single local SLC CPU can address up to 30 total slots across 3 interconnected racks.
Does replacing a 1746-A10 chassis require updating PLC code or firmware?
No. The 1746-A10 is a passive backplane housing with interconnect logic. It holds no firmware or user program memory. As long as you reinsert the CPU and I/O modules back into their exact original slot positions (Slot 0 through Slot 9), the system will boot and execute the controller logic immediately upon power-up.
What warranty is provided with this New Surplus chassis?
Every 1746-A10 chassis is covered by our comprehensive 1-year functional replacement warranty. It passes strict visual, structural, and electrical backplane continuity checks under our standard operating quality procedures prior to shipping.
