Why Do So Many Control Panels Waste Space and Money on Outputs?
Engineers and maintenance teams ask this question constantly. Traditional rack-based I/O forces you to buy output capacity in large blocks, even when a machine only needs a couple of points. The Allen-Bradley 1734-OB2E answers that challenge directly, because it is a POINT I/O digital DC output module that provides exactly two sourcing outputs. As a result, you pay only for the points your application actually uses.
This module belongs to the Allen-Bradley POINT I/O family, also known as Bulletin 1734. Rockwell Automation designed the platform around four building blocks: I/O modules, communication adapter modules, terminal base units, and power distribution modules. Consequently, the 1734-OB2E snaps into a terminal base and becomes part of a compact, distributed I/O system rather than a bulky central rack.
What the 1734-OB2E Delivers to Your Bottom Line
Each 1734-OB2E module supplies two sourcing DC outputs rated for a 24V DC field supply, with an operating range of 10-28.8V. The module handles 2A total, while each individual channel carries up to 1A. In practice, that capacity covers most pilot devices, small relays, indicator lamps, and compact solenoid valves found on packaging, assembly, and material handling equipment.
The outputs are electronically protected and include short-circuit diagnostics. When a field wire shorts, the module reports the fault instead of failing silently. Therefore, technicians locate the problem faster and restore production sooner. The on-state voltage drop stays at 0.2V maximum, so nearly all of the field voltage reaches the load and the output runs cooler.
Power consumption from the backplane is modest at 75mA of POINTBus current. Because the adapter converts 24V DC input to 5V DC backplane power, the module draws its logic power through the backplane and keeps field wiring simple. The operating temperature range of -20 to 55 C suits typical industrial enclosures, and the module mounts on a DIN rail through a 1734-TB or 1734-TBS terminal base.
Key Specifications at a Glance
| Parameter | Value |
|---|---|
| Output points | 2 sourcing DC outputs |
| Field voltage | 24V DC (10-28.8V range) |
| Current rating | 2A per module / 1A per channel |
| On-state voltage drop | 0.2V max |
| Protection | Electronically protected with short-circuit diagnostics |
| POINTBus current | 75mA |
| Operating temperature | -20 to 55 C |
| Terminal base | 1734-TB / 1734-TBS |
Where the 1734-OB2E Earns Its Keep
Consider a typical packaging line application. A case sealer needs two extra outputs to drive a pair of indicator lamps and a small diverter solenoid. Instead of adding a full rack of eight outputs, the maintenance team installs one 1734-OB2E on an existing DIN rail. The short-circuit diagnostics then flag a pinched lamp cable before it stops the line, and the team replaces the module in minutes.
In a typical automotive assembly application, a fixture station requires a compact output block near the tooling. The 1734-OB2E mounts on a terminal base close to the valves, which shortens field wiring runs and reduces installation labor. Meanwhile, the 1A per channel rating comfortably drives the pilot valves used at the station.
Material handling systems also benefit. A conveyor zone controller can use the two sourcing outputs to trigger a brake and a status beacon. Because the module draws only 75mA from the POINTBus backplane, adding it to an existing adapter does not strain the power budget.
How the Module Fits Into Your Existing System
The 1734-OB2E integrates through the POINT I/O architecture. A communication adapter module converts 24V DC input to 5V DC backplane power, and every I/O module draws from that backplane. The terminal base unit, such as the 1734-TB or 1734-TBS, mounts on DIN rail and provides the physical and electrical connection. The I/O module and its removable terminal block then snap into the base.
This granular design means you can mix output modules with input modules and other I/O types on the same node. Consequently, a single adapter can serve a machine section with a tailored point count. The 1734-OB2E remains an active product in the POINT I/O platform, so it fits both new builds and expansions of existing installations.
Business Value: Less Downtime, Lower Wiring Cost
Every hour of unplanned downtime carries a real cost, and output faults rank among the most common causes of line stops. The short-circuit diagnostics on the 1734-OB2E turn a vague failure into a specific, actionable alarm. As a result, maintenance teams troubleshoot in minutes rather than hours.
The two-point granularity also trims capital cost. You avoid buying unused output capacity, and you reduce panel footprint because the module occupies minimal DIN rail space. Over a multi-machine rollout, those savings compound quickly. In addition, the 0.2V maximum on-state drop keeps loads operating at full voltage, which extends the life of relays and lamps.
Supply Assurance From SpareTechPLC
SpareTechPLC specializes in industrial automation spare parts and industry news, with deep experience in Allen-Bradley POINT I/O components. Our team verifies part numbers and lifecycle status before every shipment, so you receive the exact module your system needs. With stocked inventory and fast order processing, we help you keep spares on the shelf and lines running.
Frequently Asked Questions
How many outputs does the 1734-OB2E provide?
The module provides two sourcing DC outputs. Each channel carries up to 1A, and the module total is 2A. This granularity lets you add only the points a machine requires.
What field voltage does the 1734-OB2E accept?
The module operates on a nominal 24V DC field supply with a range of 10-28.8V. The on-state voltage drop is 0.2V maximum, so the load receives nearly the full supply voltage.
Does the 1734-OB2E include short-circuit protection?
Yes. The outputs are electronically protected and include short-circuit diagnostics. When a fault occurs, the module reports it so technicians can locate and correct the wiring issue quickly.
Which terminal base does the 1734-OB2E use?
The module mounts on a 1734-TB or 1734-TBS terminal base unit. The base snaps onto DIN rail and provides the backplane connection for the POINT I/O system.
Is the 1734-OB2E still an active product?
Yes. The 1734-OB2E is an active product within the POINT I/O platform, and no replacement part is listed. Please contact SpareTechPLC for current availability and lead times.
Outlook: Granular I/O Keeps Growing
As machines become more modular, the demand for right-sized I/O keeps rising. The Allen-Bradley 1734-OB2E fits that trend by delivering two protected 24V DC outputs with diagnostics in a compact, DIN-rail-mounted package. For teams that value uptime and cost control, it remains a practical building block for distributed control systems.
