Allen-Bradley 1734-OB8S – 8-Channel Safety Sourcing Output Module

Name: Allen-Bradley 1734-OB8S – 8-Channel Safety Sourcing Output Module
Brand: Allen-Bradley

Model: 1734-OB8S

Brand Allen-Bradley

Series Pending

Model 1734-OB8S

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Technical Dossier

Product Details And Specifications

Allen-Bradley 1734 POINT I/O Series Technical Notes

The Allen-Bradley 1734 POINT I/O series, developed by Rockwell Automation, is a modular distributed I/O platform deployed across heavy industrial sectors including petrochemical refining, nuclear power generation, offshore oil & gas, and large-scale discrete manufacturing. Its compact DIN-rail-mounted architecture supports high-density I/O expansion with per-point wiring, making it the dominant distributed I/O standard in North American process control infrastructure. The 1734-OB8S is a safety-rated 8-channel sourcing digital output module within this series, certified for use in SIL 2 safety instrumented systems (SIS) and compliant with IEC 61508 and IEC 62061 functional safety standards.

The Evolution of 1734 POINT I/O Architecture

The 1734 POINT I/O platform was introduced in the late 1990s as a successor to fixed-block I/O architectures, addressing the need for granular, per-point I/O expansion in distributed control systems. Early revisions used a proprietary backplane bus operating at 500 kbps; subsequent generations migrated to a high-speed serial backplane capable of 12 Mbps throughput. The platform supports multiple communication adapter options — DeviceNet, EtherNet/IP, ControlNet, PROFIBUS DP, and FOUNDATION Fieldbus — enabling integration into both legacy DCS environments and modern IIoT-connected architectures.

Safety variants, including the 1734-OB8S, were introduced as functional safety requirements became codified under IEC 61508 Ed.2 and OSHA PSM regulations. These modules operate on the same physical backplane as standard 1734 I/O but require a dedicated safety adapter (1734-AENTR or 1734-AENT) and are programmed exclusively through Studio 5000 Logix Designer with the Safety Task configuration. The series remains in active production as of 2026, with Rockwell Automation providing long-term availability commitments through its Lifecycle Status program.

1734 POINT I/O Full Catalog & Functionalities (SKU List)

Safety Digital Output Modules

1734-OB8S: 8-channel safety sourcing digital output, 24V DC, SIL 2, IEC 61508 certified
1734-OB4ES: 4-channel safety sourcing output with diagnostics, 24V DC, SIL 2

Safety Digital Input Modules

1734-IB8S: 8-channel safety sinking digital input, 24V DC, SIL 2
1734-IE4S: 4-channel safety analog input, 4–20 mA / 0–10V, SIL 2

Standard Digital Output Modules

1734-OB2EP: 2-channel protected sourcing output, 24V DC, 2A per channel
1734-OB4E: 4-channel electronically protected sourcing output, 24V DC
1734-OB8: 8-channel sourcing digital output, 24V DC, 0.5A per channel
1734-OW4: 4-channel relay output, 240V AC / 24V DC, 2A per channel

Standard Digital Input Modules

1734-IB8: 8-channel sinking digital input, 24V DC
1734-IB8S: 8-channel sinking input, 24V DC, high-speed version
1734-IA4: 4-channel AC input, 120V AC
1734-IV8: 8-channel sinking/sourcing input, 24V DC, IEC Type 1/3

Analog I/O Modules

1734-IE2C: 2-channel current input, 4–20 mA, 16-bit resolution
1734-IE4C: 4-channel current input, 4–20 mA, 16-bit resolution
1734-OE2C: 2-channel current output, 4–20 mA, 16-bit resolution
1734-IE2V: 2-channel voltage input, 0–10V / ±10V, 16-bit resolution

Communication Adapters

1734-AENTR: EtherNet/IP dual-port adapter, supports Device Level Ring (DLR), safety-capable
1734-AENT: EtherNet/IP single-port adapter, standard and safety I/O
1734-ADN: DeviceNet adapter, 500 kbps

Power Distribution & Base Units

1734-EP24DC: 24V DC power distribution module, 4A
1734-TOP: Terminal base, spring-clamp wiring, single-point
1734-TOPS: Terminal base, screw-clamp wiring, single-point

Quality Control for the 1734 POINT I/O Range

The 1734 series presents specific test challenges due to its high-speed serial backplane bus and the diagnostic complexity of safety-rated modules. DriveKNMS applies the following test protocol to all 1734 units prior to shipment:

Backplane communication verification using a live 1734-AENTR adapter and Studio 5000 Logix Designer connection test
Channel-by-channel I/O functional test under rated load conditions (24V DC, rated current per channel)
For safety modules (1734-OB8S, 1734-IB8S, 1734-IE4S): safety function proof test per IEC 61511-1 Clause 16, including output de-energize response time measurement
Firmware revision identification and documentation against Rockwell Automation Product Compatibility and Download Center (PCDC) records
Visual inspection of backplane connector pins, terminal base locking mechanism, and module housing for mechanical integrity
Burn-in cycle: 48-hour powered operation at ambient temperature prior to final inspection

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