Allen-Bradley 1734 POINT I/O Modules – 1734-IB8

Technical Dossier

Product Details And Specifications

Allen-Bradley 1734 POINT I/O Series Technical Notes

The 1734 series communicates natively over EtherNet/IP, DeviceNet, ControlNet, and PROFIBUS DP via dedicated adapter modules, making it compatible with a broad range of Rockwell Automation control platforms including ControlLogix, CompactLogix, and legacy PLC-5 systems through appropriate gateway configurations. Its modular backplane design supports up to 63 I/O modules per adapter node, with each module occupying a single slot and drawing power directly from the POINT I/O power rail.

The Evolution of 1734 POINT I/O Architecture

The 1734 POINT I/O platform was introduced by Rockwell Automation in the late 1990s as a successor to distributed I/O solutions that required dedicated wiring racks and fixed-slot configurations. The original release targeted DeviceNet as its primary network backbone, with the 1734-ADN DeviceNet Adapter serving as the primary communication gateway.

In the early 2000s, Rockwell expanded the platform to support ControlNet (1734-ACNR) and introduced the first generation of specialty modules including thermocouple inputs and high-speed counter modules. The introduction of EtherNet/IP adapters (1734-AENT, later 1734-AENTR with DLR ring topology support) marked the platform's transition into the modern industrial Ethernet era, aligning it with the broader Integrated Architecture strategy.

By the 2010s, the 1734 series had achieved widespread installed base status across global process industries. Rockwell Automation progressively released enhanced variants — notably the 1734-EP24DC isolated power rail extender and the 1734-TOPS/TOPSC terminal base options — to address complex wiring and isolation requirements in hazardous environments. Several early-generation modules (including certain 1734-IB8 revisions and first-generation analog modules) have entered the mature/end-of-life phase, meaning Rockwell no longer manufactures them but continues to provide limited technical support. For facilities running these legacy revisions, third-party lifecycle extension sourcing is the primary procurement path.

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

Digital Input Modules

• 1734-IB8: 8-point 24VDC sinking digital input module, standard response time, single-wide housing
• 1734-IB8S: 8-point 24VDC safety-rated sinking digital input, SIL 2 / PLd certified
• 1734-IV8: 8-point 24VDC sourcing (IEC Type 1/3) digital input module
• 1734-IB16: 16-point 24VDC sinking digital input, high-density double-wide housing
• 1734-IM4: 4-point 120/240VAC digital input module, isolated inputs

Digital Output Modules

• 1734-OB8: 8-point 24VDC sourcing digital output, 0.5A per point
• 1734-OB8S: 8-point 24VDC safety-rated sourcing digital output, SIL 2 / PLd certified
• 1734-OV8E: 8-point 24VDC sinking digital output with electronic fuse protection
• 1734-OW4: 4-point relay output module, Form A contacts, 2A per point
• 1734-OM4: 4-point 120/240VAC triac output module

Analog Input/Output Modules

• 1734-IE2C: 2-channel current (4–20mA) analog input, 16-bit resolution
• 1734-IE2V: 2-channel voltage (0–10V / ±10V) analog input, 16-bit resolution
• 1734-IE4C: 4-channel current analog input module, single-ended
• 1734-OE2C: 2-channel current analog output, 16-bit resolution, 4–20mA
• 1734-OE2V: 2-channel voltage analog output, 0–10V / ±10V

Specialty & Communication Modules

• 1734-IT2I: 2-channel isolated thermocouple input, supports J/K/T/E/R/S/B types
• 1734-IR2: 2-channel RTD/resistance input, supports Pt100/Pt1000/Ni
• 1734-HSC: High-speed counter module, up to 1MHz input frequency
• 1734-AENT: EtherNet/IP adapter, single-port, supports up to 63 I/O modules
• 1734-AENTR: EtherNet/IP adapter with Device Level Ring (DLR) topology support
• 1734-ADN: DeviceNet adapter module, legacy network gateway
• 1734-ACNR: ControlNet adapter with redundant media support
• 1734-EP24DC: 24VDC power rail extender for isolated power segments

Sourcing Hard-to-Find & Obsolete 1734 POINT I/O Parts

All 1734 modules sourced through DriveKNMS are subject to pre-shipment functional verification. Customers requiring specific hardware revision levels (e.g., Series A vs. Series B 1734-IB8) should specify this requirement at the time of inquiry to ensure compatibility with existing installed base configurations.

Quality Control for the 1734 POINT I/O Range

The 1734 POINT I/O platform presents specific quality control challenges due to its backplane bus architecture and the interdependency between terminal bases (1734-TB series) and I/O modules. DriveKNMS applies the following test protocol to all 1734 series units:

• Backplane continuity verification: Each module is seated in a reference terminal base and backplane communication integrity is confirmed prior to functional testing.
• Digital I/O point-level verification: All input and output points are individually stimulated and verified against expected logic states using a dedicated test fixture that replicates field wiring conditions.
• Analog channel calibration check: For analog modules (IE2C, IE2V, OE2C, OE2V, IT2I, IR2), each channel is verified against a calibrated reference source at 0%, 25%, 50%, 75%, and 100% of rated range.
• EtherNet/IP adapter commissioning test: AENT and AENTR adapters are powered, assigned a test IP address, and verified for successful I/O module enumeration and EDS-based configuration response.
• Visual and mechanical inspection: Connector pins, locking tabs, and module housing are inspected for wear, corrosion, or physical damage that could affect field installation reliability.