Allen-Bradley 1734-OB8E — 8-Point 24VDC Sourcing Digital Output Module | POINT I/O Platform
Engineering Background
The Allen-Bradley 1734-OB8E is a compact, high-density digital output module engineered for the POINT I/O distributed I/O platform by Rockwell Automation. Designed to operate within EtherNet/IP and DeviceNet architectures, it delivers deterministic, high-speed discrete control in space-constrained panel environments. Its modular, single-slot form factor makes it the preferred choice for machine builders and system integrators who demand scalability without sacrificing performance.
Product Positioning
The 1734-OB8E targets procurement engineers and automation specialists sourcing reliable, specification-verified output modules for new installations, MRO replacements, or capacity expansions. Konmask.com supplies this module from verified surplus and authorized channels, ensuring full traceability and functional integrity for mission-critical deployments.
Complete Technical Specifications
| Catalog Number | 1734-OB8E |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Platform | POINT I/O |
| Module Type | Digital Output (Sourcing) |
| Number of Output Points | 8 |
| Output Voltage Range | 10–28.8V DC |
| Rated Output Voltage | 24V DC |
| Output Current per Point | 0.5 A continuous |
| Total Module Current | 4 A max (all points ON) |
| Output Type | Solid-state sourcing (PNP) |
| Leakage Current | ≤ 0.1 mA |
| Voltage Drop (ON state) | ≤ 0.5V DC |
| Response Time (OFF→ON) | ≤ 0.2 ms |
| Response Time (ON→OFF) | ≤ 0.5 ms |
| Short-Circuit Protection | Electronic, per point |
| Overload Protection | Yes — thermal shutdown with auto-recovery |
| Isolation | 500V AC (field side to backplane) |
| Communication Interface | POINT I/O backplane (EtherNet/IP / DeviceNet via adapter) |
| Module Width | Single slot (12 mm) |
| Operating Temperature | 0°C to +55°C (32°F to 131°F) |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5–95% non-condensing |
| Vibration Rating | IEC 68-2-6 |
| Shock Rating | IEC 68-2-27 |
| Certifications | UL, CE, C-Tick, ATEX (Zone 2) |
| Weight | Approx. 40 g |
| Wiring Style | Removable terminal block (RTB) |
Proven Application Environments
- Automotive Assembly Lines — Driving solenoid valves, actuators, and indicator lamps in high-cycle body-shop and paint-shop cells.
- Food & Beverage Processing — Controlling conveyor drives, filling valves, and reject gates in washdown-adjacent panels (IP20 enclosure required).
- Pharmaceutical Manufacturing — Interfacing with SCADA-controlled dosing pumps and isolation valves under 21 CFR Part 11 environments.
- Material Handling & Logistics — Activating diverters, sorters, and gate controls in high-throughput distribution centers.
- Water & Wastewater Treatment — Switching pump contactors and valve actuators in remote POINT I/O drop panels.
- Machine Tool & Robotics — Providing fast, deterministic output switching for servo-adjacent discrete control tasks.
Engineering Advantages
- Per-Point Electronic Protection — Each of the 8 output channels features independent short-circuit and overload protection, eliminating single-point failure propagation across the module.
- Ultra-Fast Switching — Sub-millisecond ON/OFF response times (≤0.2 ms / ≤0.5 ms) support high-speed machine sequencing without output latency.
- Compact Single-Slot Footprint — 12 mm width maximizes I/O density in constrained DIN-rail panels, reducing enclosure size and BOM cost.
- Hot-Swap Capable — Supports module replacement under power when used with compatible POINT I/O adapters, minimizing planned downtime.
- Removable Terminal Block (RTB) — Pre-wired RTB allows module swap without rewiring field cables, accelerating MRO replacement cycles.
- ATEX Zone 2 Certification — Approved for use in potentially explosive atmospheres (gas group IIC, temperature class T4), expanding deployment scope.
- Seamless Studio 5000 / RSLogix 5000 Integration — Native Add-On Profile (AOP) support enables drag-and-drop configuration with full diagnostic visibility in Logix Designer.
System Architecture & Signal Flow
The 1734-OB8E mounts directly onto a POINT I/O base unit and communicates via the POINT I/O backplane to the network adapter (e.g., 1734-AENT for EtherNet/IP or 1734-ADN for DeviceNet). The Logix controller sends output data over the network to the adapter, which distributes it across the backplane to the OB8E module. Each output channel drives a solid-state sourcing transistor that switches 24V DC to the connected field device (solenoid, relay coil, indicator, etc.). Diagnostic data — including per-point fault status and module health — is returned upstream to the controller via the same I/O connection, enabling real-time fault detection without additional hardware.
Typical signal path: Logix Controller → EtherNet/IP Network → 1734-AENT Adapter → POINT I/O Backplane → 1734-OB8E → Field Device
Sourcing & Quality Verification
- Source Traceability — All units sourced from verified surplus inventories, authorized distributors, or factory-refurbished channels with documented chain of custody.
- Functional Testing — Each module undergoes power-on verification and output channel actuation testing prior to shipment.
- Visual & Label Inspection — Catalog number, firmware revision label, and terminal block condition inspected against OEM specifications.
- Packaging Integrity — Shipped in anti-static packaging with foam cushioning; original OEM packaging preserved where available.
- Counterfeit Mitigation — Units are cross-referenced against Rockwell Automation catalog data; suspected non-genuine units are quarantined and not listed.
Procurement Process
- Confirm Compatibility — Verify your POINT I/O adapter model and backplane slot availability. The 1734-OB8E requires one single-width base (1734-TB or 1734-TBS).
- Request a Quote — Contact support@konmask.com for volume pricing, lead time confirmation, or expedited sourcing.
- Place Order — Add to cart and complete checkout. Purchase orders (PO) accepted for qualified B2B accounts.
- Shipping & Documentation — Ships within 1–3 business days. Commercial invoice, packing list, and test report available upon request.
- Post-Delivery Support — Technical commissioning support available via email or phone. DOA claims processed within 7 days of receipt.
Technical FAQ
Q: Is the 1734-OB8E compatible with both EtherNet/IP and DeviceNet adapters?
A: Yes. The module communicates via the POINT I/O backplane and is adapter-agnostic. It works with any POINT I/O network adapter including 1734-AENT (EtherNet/IP), 1734-ADN (DeviceNet), and 1734-ACNR (ControlNet).
Q: Can I replace the module without rewiring?
A: Yes. The removable terminal block (RTB) retains field wiring. Simply unplug the RTB, swap the module, and reattach — no rewiring required.
Q: What is the maximum inrush current the output can handle?
A: The output is rated for 0.5 A continuous per point. For inductive loads with high inrush, ensure the steady-state current remains within this limit; use external suppression (flyback diode or MOV) for solenoid coils.
Q: Does this module support diagnostic fault reporting?
A: Yes. The 1734-OB8E reports per-point short-circuit and overload faults back to the Logix controller via the I/O connection, visible in Studio 5000 Logix Designer without additional programming.
Q: Is the unit new or refurbished?
A: Stock condition is specified at the time of quotation. Konmask supplies new-surplus (unused, original packaging), tested-surplus, and factory-refurbished units. Contact us to confirm current stock condition before ordering.
Q: What certifications does the 1734-OB8E carry?
A: UL Listed, CE Marked, C-Tick (RCM), and ATEX certified for Zone 2 hazardous locations (Ex nA IIC T4 Gc).
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