Allen-Bradley 1734-OB8E POINT I/O 8-Point Protected 24V DC Output Module

A protected version of the 8-point POINT I/O output

The Allen-Bradley 1734-OB8E is the protected output module of the POINT I/O family. It gives eight 24V DC sourcing outputs of 1.0 A each and adds electronic protection with a red fault indicator per output, so an overloaded or shorted channel is shown at the module instead of simply tripping a fuse elsewhere.

For general switching of relays and lamps without per-output protection, the sheet lists the standard 1734-OB8. The E module is the better choice where field wiring is long, loads are exposed and quick diagnosis matters.

Technical specifications

What the fault indication tells you

Each channel has a yellow status LED showing the output state and a red LED for a fault. A steady red indicator means a short circuit is detected on that output. The two green/red module and network LEDs show device health, and the installation sheet lists a recoverable fault and an unrecoverable fault condition.

The electrical ratings match the standard module: 10 to 28.8V DC on-state range, 0.2V DC maximum drop, 0.5 mA off-state leakage and a 0.1 ms maximum delay. The surge current is 2 A for 10 ms, repeatable every 3 seconds, and the combined current of all outputs must not exceed 3.0 A.

Keying and installation

The protected modules use keyswitch position 1, so they will not seat on a base keyed for a different module type. They fit the 1734-TB, 1734-TBS, 1734-TOP and 1734-TOPS wiring bases. The module draws 32 mA of 24V DC field power and 75 mA from POINTBus.

The sheet lists Zone 2 ATEX and IECEx marks (Ex ec IIC T4 Gc) among the certifications as printed, together with the temperature codes. Check the label of the module supplied and mount it in an enclosure with at least the protection rating the sheet specifies for hazardous locations.

Documents and quotation

The sheet 1734-IN056 describes the protected output modules. Provide the 1734-OB8E reference, series, quantity, the adapter or controller and the load types when you ask for a quotation. Related hardware is listed in PLC & I/O Cards.

How the 1734-OB8E Works

Like other POINT I/O output modules, the 1734-OB8E plugs into a terminal base on the DIN rail. Logic power and data reach it through POINTBus from the adapter, while the 24V DC that drives the loads comes from the field power bus that runs through the terminal bases. When an output is switched on, the module sources current from the field supply to the load, and the load returns to the common.

The E suffix denotes electronic protection. Each output monitors its own condition, and when a short circuit is detected the red fault indicator for that channel lights and the fault is reported to the controller. This lets maintenance staff find the faulty circuit at the panel, and lets the program react to the fault, instead of relying only on an upstream fuse or breaker that would disconnect every output on the same supply.

1734-OB8E Selection & Ordering Guide

• Protected or standard: choose the 1734-OB8E where per-output fault indication is useful; the 1734-OB8 is the standard eight-point version.
• Current budget: each output is rated 1.0 A, but the module total is 3.0 A, so check the total of loads that can be on at the same time.
• Terminal base: order a 1734-TB or 1734-TBS two-piece base, or a 1734-TOP or 1734-TOPS one-piece base, if the module is not going onto an existing base.
• Adapter and power: confirm the POINT I/O adapter in use and whether a field power distributor or expansion power supply is needed for the size of the rail.
• Coated version: the 1734-OB8EK is the conformal-coated variant.

Include the series letter and the adapter type when you request a quote for the 1734-OB8E. Our team can help confirm the correct ordering code.

Installation & Maintenance

Set the keyswitch on the terminal base to match the module before inserting it, and follow the installation instructions on whether the module may be inserted or removed under power in your area classification; in hazardous locations, remove power first. Wire each load between its output terminal and the common, fit suppression across inductive loads, and keep the DIN rail properly grounded.

When a red fault indicator appears, isolate and inspect the field wiring and load for a short circuit before resetting. Routine checks include verifying the field supply voltage, inspecting terminal screws and checking that the module and network status indicators are green.

Typical Applications in Oman & the GCC

• Distributed I/O on oil and gas wellhead and process skids, where field wiring is long and faults must be located quickly.
• Water treatment and desalination plants driving solenoid valves and interface relays.
• Material handling, packaging and bottling lines using EtherNet/IP POINT I/O close to the machine.
• Building management and district cooling panels with compact remote I/O.

Why Source the 1734-OB8E from Seven Star LLC

Seven Star LLC supplies Allen-Bradley POINT I/O modules and terminal bases, including the 1734-OB8E, across Oman and the GCC. Request a quote with the full catalog number and quantity, and our team can help confirm the correct ordering code and the matching base.