Introduction to the 1734-OB4E Output Module
Downtime in a distributed control system often traces back to a single failed output point. The Allen-Bradley 1734-OB4E solves that problem with four sourcing outputs in one compact POINT I/O module. This 24 VDC digital DC output module delivers reliable control for solenoids, relays, and indicators. Because the platform remains active, you can standardize new builds and replace failed points without redesigning your I/O architecture.
Technical Specifications That Matter
The 1734-OB4E operates at 24 VDC nominal with a range of 10-28.8 VDC. Each channel handles 1.0 A, while the module supports 3.0 A total. Electronic short-circuit and overload protection on every channel prevents a single fault from taking down the group. Off-state leakage stays at 0.5 mA at 28.8 VDC, and the on-state voltage drop maxes out at 0.2 VDC. A signal delay of 0.1 ms ON/OFF keeps response fast for time-sensitive logic. The module also survives a 2 A surge for 10 ms. Power dissipation reaches 1.2 W max, and PointBus current draw is 75 mA at 5V DC. Isolation is rated 50 V continuous (2500 VDC tested). The keyswitch position is 1, and the unit mounts on DIN rail. Operating temperature spans -20 to 55 C.
Where the 1734-OB4E Delivers Value
Packaging and Material Handling
High-speed sorting lines rely on fast output response. The 0.1 ms signal delay lets the 1734-OB4E trigger pneumatic diverters and ejector solenoids without lag. Electronic protection reduces nuisance trips when a coil shorts, keeping the line running.
Automotive Assembly
Welding cells and conveyor zones use 24 VDC relays and indicators. The 3.0 A total capacity supports multiple devices in one group. Four yellow status LEDs and four red fault LEDs speed up diagnostics during shift changes.
Water and Wastewater Treatment
Remote pump stations often run in Class I Division 2 / Zone 2 areas. The 1734-OB4E is rated for those environments. Its -20 to 55 C range handles outdoor cabinets in many climates.
Installation and Setup
Mount the terminal base (1734-TBx) on DIN rail first. The base provides the POINTBus backplane. Snap the 1734-OB4E into the base, then attach the removable terminal block (RTB). The adapter converts 24 VDC input to 5V DC backplane power, so the module draws power from the backplane. Confirm the keyswitch position is 1 before applying field power. Use the four yellow status LEDs to verify output state and the four red fault LEDs to spot short circuits or overloads. Always follow local wiring codes and the manufacturer’s installation guide.
Compatibility and Integration
The 1734-OB4E works with DeviceNet, ControlNet, EtherNet/IP, or PROFIBUS adapters in the POINT I/O system. That flexibility lets you standardize on one output module across multiple networks. The module provides 4 sourcing outputs in 1 non-isolated group. If you need more points, add modules to the same terminal base assembly. The granular 1-to-8 point design keeps cost and panel footprint low.
Maintenance and Reliability
Inspect the module periodically for loose terminal connections and LED faults. The electronic protection resets after a fault clears, but repeated trips point to a failing field device. Keep the cabinet within the -20 to 55 C operating range. Because the 1734-OB4E is active, spare parts remain available. That protects your long-term investment and avoids forced upgrades.
Selection Guide
Before ordering, verify your field voltage is within 10-28.8 VDC and your total load stays under 3.0 A. Check that your adapter supports the POINTBus backplane. You will need a 1734-TBx terminal base and an RTB for each module. SpareTechPLC stocks the 1734-OB4E and related POINT I/O components. Contact SpareTechPLC to confirm current lifecycle status and availability before finalizing your bill of materials.
Frequently Asked Questions
What makes the 1734-OB4E different from a standard output module?
It combines four sourcing outputs with per-channel electronic short-circuit and overload protection. That protection reduces downtime from field wiring faults.
Can I use the 1734-OB4E in hazardous locations?
Yes. The module is rated for Class I Division 2 / Zone 2 installations when used with approved enclosures and wiring methods.
How many LEDs does the 1734-OB4E have?
It has four yellow status LEDs and four red fault LEDs for quick diagnostics.
What is the maximum current per channel?
Each channel handles 1.0 A, with a 3.0 A total limit for the module.
Is the 1734-OB4E still an active product?
Yes. Rockwell Automation lists it as active with no replacement. Verify availability with SpareTechPLC before ordering.
