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PLC, I/O & HMI
1756-L73
Allen-Bradley
Allen-Bradley 1756-L73 sourcing reference. Send the complete nameplate details and required quantity for review.
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Reference details
- Manufacturer / brand
- Allen-Bradley
- Model / reference
- 1756-L73
- Series / type
- Confirm against nameplate
- Condition
- Confirm with inquiry
- Quantity
- Confirm with inquiry
- Lead time
- Confirm with inquiry
Product information
Product Overview
The 1756-L73 is a ControlLogix 5570 controller with 8 MB of user memory (plus 0.98 MB of I/O memory). Series B hardware adds a USB local programming port and Secure Digital non-volatile memory support. Like all 5570 controllers it has no embedded network port — EtherNet/IP and other networks are added through 1756 communication modules (EN2T, ENBT, CNB) in adjacent chassis slots. Rockwell’s official lifecycle status is Active — Mature.
Technical Specifications (Official Rockwell Data)
| Product family | ControlLogix 5570 controller |
|---|---|
| User memory | 8 MB (plus 0.98 MB I/O memory) |
| Non-volatile memory | Secure Digital (SD) card |
| Embedded network port | None — networks via 1756 communication modules |
| Local programming port | 1 × USB (Series B) |
| Power draw | 5 mA @ 1.2 V DC, 800 mA @ 5.1 V DC |
| Power dissipation (full load) | 2.5 W |
| Product series | Series B |
| Lifecycle status (Rockwell) | Active – Mature |
Lifecycle Status & Availability
Official lifecycle status is Active – Mature: the L73 remains orderable and repairable, with the ControlLogix 5580 family (L83E at the same 10 MB class) recommended for new designs. Its 8 MB memory made it the volume choice for large machines and process units in the 5570 era, so the installed base is extensive and spares demand stays steady.
Typical Applications
- Large-machine and process-unit panels standardized on 5570 controllers where 8 MB already fits the program
- Revision-matched spares for lines running frozen 5570 firmware baselines
- Stepping-stone replacement while a staged migration to 5580 hardware is scheduled
Related & Compatible Models
Neighbours in the 5570 ladder: 1756-L71 (2 MB) and 1756-L72 (4 MB) below, 1756-L74/L75 above. Direct 5580 successor: 1756-L83E (10 MB, embedded Gigabit EtherNet/IP, 250 EtherNet/IP devices) — drop-in compatible with the same chassis, power supplies and I/O.
Requesting a Quotation
State the series letter and firmware revision from the product label (Series A vs B differ in ports), whether the SD card is included in your requirement, and the quantity. Stock and pricing are confirmed per request — mature-status controllers can see supply gaps, so exact revision details help us source the right unit.
Frequently Asked Questions
1756-L73 vs 1756-L83E — what is the upgrade path?
The L83E (5580) gives more user memory (10 MB), an embedded 1 Gbps EtherNet/IP port (up to 250 devices) and current-generation support, reusing the same chassis, power supply and I/O. Migration is a planned change: verify firmware and program conversion in Studio 5000 first.
Is the L73 discontinued?
No — official status is Active–Mature. It is still manufactured and repairable, but Rockwell directs new projects to 5580 controllers. Confirm status at order time for long-lead projects.
What memory does it really have?
Official data: 8 MB user memory plus 0.98 MB I/O memory, with SD-card support as the non-volatile option (Series B).
Do I need an Ethernet module?
Yes — no embedded port on 5570 controllers. Use the 1756-EN2T (Active) rather than the discontinued ENBT for new orders.
MODEL INQUIRY
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