1756-OB16

Product information

Product Overview

The 1756-OB16 catalog number identifies a ControlLogix 16-point DC sourcing digital output module — one of the earliest 1756 I/O cards, widely deployed in the first decade of the ControlLogix platform. Rockwell has since removed the plain 1756-OB16 from its current product catalog: the detail page is no longer published, and the current-edition I/O specifications document (1756-TD002) lists only the successor variants 1756-OB16E (electronically fused outputs) and 1756-OB16D (diagnostic outputs), both officially Active.

Technical Specifications (Official Rockwell Data)

Product family	ControlLogix digital I/O module (legacy catalog number)
Function	16-point DC sourcing digital output
Successors (officially Active)	1756-OB16E — 10–31 V DC, electronically fused, 16 pts, 20-pin
Successors (officially Active)	1756-OB16D — 19–30 V DC, per-point diagnostics, 1 A/pt, 16 pts, 36-pin
Typical successor spec (OB16E)	1 A per point @ 60 °C, 4.1 W dissipation, 250 V isolation in groups of 8
Module location	Any slot of a 1756 chassis
Lifecycle status (Rockwell)	Removed from current catalog (successors Active)

Lifecycle Status & Availability

Honest status note: Rockwell no longer publishes a product page for the plain 1756-OB16, and the current 1756-TD002 I/O specifications (September 2026 edition) no longer list it — the catalog role has passed to the OB16E/OB16D variants, which are Active. Detailed per-point electrical ratings of the original OB16 therefore cannot be quoted from a current official source on this page. Buyers should treat the OB16 as a legacy item: identify the exact unit from the nameplate (series letter, firmware) and either source revision-matched surplus or plan the successor swap.

Typical Applications

• Spare-part demand for first-generation ControlLogix panels still switching 24 V DC loads on legacy OB16 hardware
• Planned migration projects that map legacy OB16 slots to OB16E (fused) or OB16D (diagnostic) equivalents
• Failure analysis and repair decisions on aging output modules

Related & Compatible Models

Officially Active family members: 1756-OB16E (10–31 V DC, electronic fusing per group) and 1756-OB16D (19–30 V DC, per-point diagnostics, 36-pin). Input counterpart: 1756-IB16. All are chassis-compatible across the 1756 range.

Requesting a Quotation

Because this exact catalog number is no longer in Rockwell’s current catalog, please attach a nameplate photo showing catalog number, series letter and firmware revision, state the quantity, and mention whether a successor (OB16E/OB16D) substitution is acceptable. This page intentionally avoids listing unverifiable electrical ratings; the quotation will confirm condition, exact revision and availability individually.

Frequently Asked Questions

Is the 1756-OB16 discontinued?

Rockwell no longer publishes the OB16 as a catalog product — its role has passed to the 1756-OB16E and 1756-OB16D, which are officially Active. Remaining OB16 stock exists in the secondary market and is verified per request.

Which successor should I choose?

The OB16E adds electronic fusing per output group (10–31 V DC); the OB16D adds per-point diagnostics with a 19–30 V DC range on a 36-pin block. Choose based on whether your panel benefits from fuse protection or channel-level diagnostics.

Can I see the OB16’s full specifications here?

No — and we prefer to say so plainly. Rockwell’s current official documentation no longer covers this catalog number, and we do not fill specification tables from unofficial sources. Send a nameplate photo and we will confirm the exact revision in the quotation.

Will an OB16E drop into an OB16 slot?

The modules share the 1756 chassis platform, but terminal-block pinout (20-pin vs 36-pin) and diagnostics differ. A controlled swap usually needs wiring checks and program-side verification — include your panel details when requesting a substitution quote.