Allen-Bradley / Rockwell · PLC-5 · PLC CPU

Allen-Bradley / Rockwell 1785-L80B

DiscontinuedMEDIUM

What should replace this part?

Your options

Our analysisRemanufacture / repair bridge

OEM remanufacturing and repair services cover PLC-5 while conversion is scoped.

Our analysisMigrate PLC-5 program to ControlLogix

OEM migration program prefers 5580 controllers; code-conversion tooling carries RSLogix 5 forward with validation.

Replacement analysis

Original: 1785-L80B (PLC-5/80 processor)

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Replacement: ControlLogix 1756 platform (5580 preferred per MIGRAT-SP005)

Relationship: Modern platform migration (not a swap) MEDIUM

Migration / engineering work required — not a drop-in. This is not presented as a drop-in replacement.

Analyst note: OEM exact page fetched. Migration program-level, no L80B->single catalog.

What changes?

Hardware	PLC-5 chassis converts to the ControlLogix chassis.
Software	RSLogix 5 converts to Studio 5000 Logix Designer with conversion tools; scan and memory models change.
Wiring	1492 wiring conversion hardware.
Communications	DH+, RIO and ControlNet convert to EtherNet/IP.

Anything not listed here is unknown — the evidence does not establish it.

Can I still buy the original?

Repair: Verified — see evidenceUsed: Unknown — not verifiedRefurbished: Unknown — not verified

New-original availability is not claimed unless evidence supports it. Availability is never implied by the existence of a listing alone.

Lifecycle

Status: Discontinued

Discontinuation date: 2017-07-31

Lifecycle source

Evidence

Every important claim traces to a source below. OEM source means the manufacturer published it; third-party source means a distributor, repair company or reseller states it; our analysis connects them — and is labeled as such.

OEM / manufacturer sources

OEM source HIGH Rockwell Automation · Tier A · 2026-09-10

PLC-5 Processor discontinued as of 2017-07-31; Engineering Replacement

“Rockwell Automation announces that as of July 31, 2017, the PLC-5 Processor will be discontinued and no longer available for sale.”

Establishes: modern_platform_migration · View source · Note: Fetched exact

OEM source MEDIUM Rockwell Automation · Tier A

PLC-5 discontinued 2017; migrate to ControlLogix with 5580 preferred

“After more than 30 years... PLC-5 control platform... was discontinued in 2017... Migrating PLC-5 controllers to ControlLogix... 5580 preferred.”

Establishes: modern_platform_migration · View source · Note: Program-level; search-verified

Why you might be searching this

PLC-5 spare pool exhausted; convert the code or re-platform, and what breaks?

Related replacement analyses

Allen-Bradley / Rockwell 1747-L553 — Same plc cpu line
Allen-Bradley / Rockwell 1771-IBD — Same family: PLC-5

Need help deciding between repair, replacement, or migration?

Request a replacement review for 1785-L80B — repair assessment, sourced original, replacement quote, or migration scoping.

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Research status: done. Confidence MEDIUM reflects the evidence above, not marketing. Commercial paths: Migration scoping · ControlLogix 1756 quote · Remanufacturing bridge. No search-volume, pricing or revenue claims are made on this page.