EquipVector
Evidence-backed decisions for obsolete industrial parts

Allen-Bradley / Rockwell · SLC 500 · PLC I/O module · 16-pt 24VDC source output SLC

Allen-Bradley / Rockwell 1746-OB16

Discontinued (family)

Analysis reviewed: September 11, 2026

What should replace this part?

The verified replacement is 5069-OB16 + 1492-CM1746-M03. This is an engineering replacement, not a drop-in swap.

Replace with 5069-OB16 using the conversion cable and module

Your options

5069-OB16 with conversion hardware
Rockwell's conversion row pairs the 1746-OB16 with the 5069-OB16 and conversion module 1492-CM1746-M03 for its 16-point sourcing DC output. Confirm the Compact 5000 module supports your field devices before ordering.
Repair the original
Repair shops quote the exact model on request, but repairability for this exact module is not confirmed. Check before planning around repair.

What will need to change?

HardwareThe SLC chassis gives way to a Compact5000 (5069) chassis.
WiringThe 1492-CM1746-M03 conversion module carries your field wiring across. Re-terminate at the new RTB.
SoftwareMove the project from RSLogix 500 to Studio 5000.

For anything not listed here, check the replacement manual against your existing configuration.

Need help confirming this replacement?

Send us the part number and current setup for 1746-OB16. We'll help determine whether you need a replacement, repair, original-stock sourcing, or a migration.

Request a replacement review

Can I still buy the original?

Repair — Not confirmed for this exact modelUsed — Not confirmed for this exact modelRefurbished — Not confirmed for this exact model

We did not verify current new-original stock for this exact part.

Lifecycle

Status: Discontinued (family)

Discontinuation date: March 31, 2024 (family; exact date unknown)

Lifecycle source · rockwellautomation.com

Technical evidence

The recommendation above is based on the sources listed here. OEM source means the manufacturer published it; third-party source means a distributor, repair company or reseller states it. Confidence reflects how directly those sources support the recommendation: High — directly supported by manufacturer documentation. Medium — supported by family-level, secondary, or otherwise less-direct evidence. Low — limited or indirect evidence; verify independently before ordering.

OEM / manufacturer sources

OEM source Confidence: High Rockwell Automation (selection guide 1492-SG010B-EN-P, OEM-hosted) · 2021-02
Rockwell's conversion row pairs the 1746-OB16 with the 5069-OB16 and 1492-CM1746-M03, as a current-sourcing DC output module.
Source excerpt“Digital Outputs table p10 with explicit Column 1/2/3 instructions; wiring diagram 1492-CM1746-M03 p21”
View source · Note: Confirm the Compact 5000 electrical specification against your field devices. The neighboring OB16E cell is ambiguous and gets no mapping from this row.

Third-party sources

Third-party source Confidence: Medium Industrial Monitor Direct (independent technical publisher) · 2026-09-09
Rockwell removed the SLC 5/05 family and 1746 I/O from sale on 2024-03-31, with repair support committed for about 7 years to around 2031.
Source excerpt“Removed from sale March 31 2024; repair support committed through ~March 31 2031”
View source · Note: Family-level lifecycle detail applied to this module.

Limitation: The conversion row is exact, but the neighboring OB16E cell is ambiguous — do not apply this mapping to the OB16E. Confirm field-device support and repair coverage before ordering.

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