Allen-Bradley 1734-OB4E 4-Channel Digital Output Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1734-OB4E is a 4-channel sourcing digital output module designed for the Rockwell Automation POINT I/O platform. It delivers reliable 24V DC solid-state switching for machine control, process automation, and distributed I/O architectures. This page provides full technical specifications, compatible replacement options, application guidance, and sourcing information to help engineers and procurement teams make confident decisions.
Technical Specifications
- Part Number: 1734-OB4E
- Manufacturer: Allen-Bradley / Rockwell Automation
- Series: POINT I/O
- Output Type: Sourcing (PNP), Solid-State
- Number of Channels: 4
- Output Voltage: 10–28.8V DC
- Output Current (per channel): 0.5 A max
- Total Module Current: 2 A max
- Communication Interface: POINT I/O backplane
- Backplane Current Draw: 75 mA @ 5V DC
- Operating Temperature: 0°C to 55°C (32°F to 131°F)
- Storage Temperature: -40°C to 85°C
- Protection Rating: IP20
- Dimensions (H × W × D): 94 × 12 × 71 mm (approx.)
- Weight: ~40 g
- Certifications: UL, CE, cUL
- Compatible Adapters: 1734-AENT, 1734-AENTR, 1734-ADN, 1734-APB, and other POINT I/O adapters
Compatible Replacement & Equivalent Models
The following modules are functionally compatible or serve as direct/near-direct replacements for the 1734-OB4E in most applications. Always verify electrical ratings and backplane compatibility before substitution.
- 1734-OB4 (Allen-Bradley) — 4-channel sourcing output, non-electronically fused variant; suitable for standard load switching without per-channel fault detection.
- 1734-OB8E (Allen-Bradley) — 8-channel sourcing output with electronic fusing; use when higher channel density is required in the same POINT I/O rack.
- 1734-OB8 (Allen-Bradley) — 8-channel sourcing output without electronic fusing; cost-effective upgrade path for density.
- 1734-OV4E (Allen-Bradley) — 4-channel sinking (NPN) output with electronic fusing; select when load wiring requires sinking topology.
- 1734-OW4 (Allen-Bradley) — 4-channel relay output; suitable for AC load switching or applications requiring galvanic isolation.
- Third-party POINT I/O-compatible modules — Some automation component suppliers offer compatible I/O modules. Verify backplane protocol, current ratings, and firmware compatibility before deployment.
Why Choose the Original 1734-OB4E
- Electronic Fusing (E-fuse): Per-channel electronic overcurrent protection eliminates the need for external fuses and enables faster fault recovery via software reset.
- Diagnostic Feedback: Real-time channel-level diagnostics (open-load, short-circuit, over-temperature) reported over the backplane to the controller.
- Seamless Studio 5000 / RSLogix 5000 Integration: Native Add-On Profile (AOP) support for rapid configuration and tag-based programming.
- Compact Form Factor: 12 mm wide module maximizes rack density in space-constrained panels.
- Proven Field Reliability: Widely deployed in automotive, food & beverage, and material handling industries globally.
Typical Applications
- Solenoid valve control in pneumatic and hydraulic systems
- Indicator lamp and pilot light switching
- Motor starter and contactor coil control (within current rating)
- Conveyor and material handling line control
- Packaging machine I/O expansion
- Distributed I/O nodes in EtherNet/IP or DeviceNet architectures
- OEM machine panels requiring compact, high-reliability digital outputs
System Compatibility
- Platform: Rockwell Automation POINT I/O (1734 series)
- Compatible Adapters: 1734-AENT / 1734-AENTR (EtherNet/IP), 1734-ADN (DeviceNet), 1734-APB (PROFIBUS), 1734-ACNR (ControlNet)
- Compatible Controllers: ControlLogix, CompactLogix, MicroLogix (via appropriate adapter), GuardLogix
- Software: Studio 5000 Logix Designer v21+, RSLogix 5000 v16+
- Power Supply: Requires 1734-EP24DC or equivalent POINT I/O power supply module
- Wiring Base: 1734-TB or 1734-TBS (screw or spring-clamp terminal base, sold separately)
Selection Guide
Use the following criteria to confirm the 1734-OB4E is the right module for your application, or to identify the best alternative:
- Output polarity: If your loads require sinking (NPN) outputs, select 1734-OV4E instead.
- Channel count: For 8 outputs in a single slot, consider 1734-OB8E (sourcing) or 1734-OV8E (sinking).
- Load type: For AC loads or relay isolation, select 1734-OW4 (relay output).
- Fault diagnostics: If per-channel diagnostics are not required and cost is a priority, 1734-OB4 (non-E version) is a lower-cost option.
- Current per channel: The 1734-OB4E is rated 0.5 A per channel. For higher current loads, use an external relay or solid-state relay (SSR) driven by this module.
- Safety applications: For SIL-rated safety I/O, use the 1734-OBV2S or equivalent GuardI/O module.
Quality Assurance & Sourcing
- Authenticity: All 1734-OB4E units sourced through Konmask.com are verified against manufacturer documentation and inspected prior to shipment.
- Condition: New, surplus-new, and tested-used stock available — condition clearly stated on each listing.
- Traceability: Date codes and lot numbers available upon request for critical applications.
- Warranty: 12-month warranty against manufacturing defects on new stock; 90-day warranty on surplus/used units.
- Export Compliance: ECCN classification and export documentation available for international orders.
How to Order
- Step 1: Confirm part number: 1734-OB4E and required quantity.
- Step 2: Add to cart directly on this page, or contact us for bulk/project pricing.
- Step 3: For urgent requirements, email support@konmask.com or call +0086 19859288691 for same-day quotation.
- Step 4: Specify shipping method and destination — we ship globally with DHL, FedEx, and UPS Express options.
- Step 5: Receive order confirmation with tracking number within 24 hours of payment.
Replacement & Compatibility FAQ
Q: Can I replace a 1734-OB4E with a 1734-OB4?
A: Yes, the 1734-OB4 is a direct functional replacement for most applications. The key difference is the absence of electronic fusing (E-fuse) on the OB4. You will lose per-channel overcurrent protection and diagnostic feedback. Suitable for non-critical loads where external fusing is acceptable.
Q: Is the 1734-OB4E compatible with all POINT I/O adapters?
A: Yes, it is compatible with all standard 1734-series adapters including EtherNet/IP (1734-AENT/AENTR), DeviceNet (1734-ADN), PROFIBUS (1734-APB), and ControlNet (1734-ACNR). Verify firmware version compatibility with your specific adapter revision.
Q: Does the 1734-OB4E require a separate terminal base?
A: Yes. The module requires a 1734-TB (screw terminal) or 1734-TBS (spring-clamp terminal) wiring base, which must be ordered separately.
Q: Can I use a third-party replacement module in my existing POINT I/O rack?
A: Third-party modules may be physically compatible but are not officially supported by Rockwell Automation. Diagnostic integration, AOP support, and firmware compatibility may be limited. Konmask.com recommends genuine Allen-Bradley modules for production-critical systems.
Q: What is the lead time for the 1734-OB4E?
A: In-stock units ship within 1–3 business days. For out-of-stock items, contact us for current lead time and alternative sourcing options.
Q: Can I get a datasheet or technical drawing?
A: Yes. Contact support@konmask.com to request the official Rockwell Automation datasheet, installation instructions, or CAD drawings.
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