Allen-Bradley / Rockwell · PLC-5 · PLC I/O module

Allen-Bradley / Rockwell 1771-IBD

DiscontinuedLOW

What should replace this part?

Your options

Our analysisSource refurbished / repair the original

Unusually deep exact-model pool documented: 99 original-pack plus 58 plus 1023 refurbished units with ~$300 repair estimate.

Our analysisScope ControlLogix conversion (no exact mapping)

Platform direction is ControlLogix 1756 with 1492-CM1771 conversion; no defensible module-to-catalog mapping exists, so the 1756 bill of materials must be engineered.

Replacement analysis

Original: 1771-IBD (PLC-5 16-pt DC input module Series B)

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Replacement: none verified — see options

Relationship: Ambiguous — no verified replacement LOW

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

Analyst note: AUDIT-CONFIRMED weak. No OEM exact mapping; cousin 1771-IB page only. Rich Tier C availability.

What changes?

Hardware	1771 chassis converts to the 1756 chassis.
Wiring	1492 conversion modules and cables, or full rewire.
Software	RSLogix 5 converts to Studio 5000.
Communications	RIO and DH+ convert to EtherNet/IP architecture.

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

Can I still buy the original?

Repair: Verified — see evidenceUsed: Verified — see evidenceRefurbished: Verified — see evidence

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: 2020-03-10 (Tier C Radwell only; OEM exact date unverified)

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 MEDIUM Rockwell Automation · Tier A · 2026-09-10

PLC-5 controllers discontinued; migrate to ControlLogix

“Our Allen-Bradley PLC-5 programmable logix controllers ... are now discontinued. We are here to help you migrate... to ControlLogix.”

Establishes: modern_platform_migration · View source · Note: Platform direction only; no IBD-to-exact mapping

Third-party sources

Third-party source LOW Radwell · Tier C · 2026-09-10

DISCONTINUED BY MANUFACTURER 3/10/2020; 99 orig-pack + 58 + 1023 refurb in stock; repair ~$300

“1771IBD DISCONTINUED BY MANUFACTURER DISCONTINUED 3/10/2020 INPUT MODULE SERIES B 16 POINT 10-30VDC PLC-5”

Establishes: used_same_unit · View source · Note: Date Tier C only; availability MEDIUM. AUDIT-CONFIRMED weak

Why you might be searching this

PLC-5 input fault; is there really no exact swap, and how deep is the spare pool?

Related replacement analyses

Allen-Bradley / Rockwell 1746-IB16 — Same plc i/o module line
Allen-Bradley / Rockwell 1785-L80B — Same family: PLC-5

Need help deciding between repair, replacement, or migration?

Request a replacement review for 1771-IBD — repair assessment, sourced original, replacement quote, or migration scoping.

Request a replacement review

Research status: done. Confidence LOW reflects the evidence above, not marketing. Commercial paths: Refurbished unit (priced stock) · Repair service (~$300 est.) · Conversion hardware quote. No search-volume, pricing or revenue claims are made on this page.