PLC-5 is a discontinued Rockwell controller family. Existing systems may still be maintained using correctly matched legacy components while a properly assessed ControlLogix migration is planned.
Lifecycle milestones by product family
| Family | Current reference status | Last order / production | Support / repairs |
|---|---|---|---|
| Allen-Bradley PLC-5 (1785) and 1771 I/O | Discontinued | not published | Not published (Rockwell says repair/exchange may be available) |
Lifecycle status may vary by exact catalogue number, hardware series and market. Confirm the precise reference with the manufacturer before relying on any deadline.
Successors and migration considerations
- Allen-Bradley PLC-5 (1785) and 1771 I/O: ControlLogix (Rockwell PLC-5 migration programme)
Migration is an engineering assessment, not an automatic drop-in substitution. Check program conversion, field wiring, communications, safety and commissioning requirements.
Find available spares
Inventory changes as items are sold and new consignments arrive, so we do not publish fixed quantities or condition claims on these reference guides.
Questions engineers ask
Does discontinued mean an installed controller must be replaced immediately?
No. It means the product's commercial lifecycle has changed, not that every installed unit has stopped functioning. Review spares availability, reliability, risk and your maintenance strategy.
Can Automation Outlet help source a legacy spare?
Yes. Send us the exact manufacturer part number, revision or series, quantity and required condition. Availability and testing status must be confirmed before an order.
Can a listed successor be swapped directly into my system?
Not necessarily. Replacement can require changes to software, wiring, communications, safety assessments and commissioning. Confirm compatibility with manufacturer documentation.
Manufacturer and supporting references
- Allen-Bradley PLC-5 (1785) and 1771 I/O: Source document ↗ · Additional reference ↗
Editorial review: 20 October 2026 · Prepared by Automation Outlet, an independent UK engineering business. Technical information is not a guarantee of stock, support entitlement or interchangeability.