Allen-Bradley 1734D-IB8XOB8E POINTBlock 16-Point DeviceNet I/O Module

Description

Product Introduction

The Allen-Bradley 1734D-IB8XOB8E is a high-density, stand-alone POINTBlock I/O module engineered for distributed control applications over DeviceNet. Unlike standard slice-based POINT I/O systems that require separate network adapters and terminal bases, the 1734D-IB8XOB8E integrates network communication, power distribution, 8 digital inputs, and 8 digital outputs into one self-contained, DIN-rail-mounted block.

Featuring 8 24V DC sink/source inputs and 8 24V DC electronically protected (fused) sourcing outputs, the module provides rapid short-circuit response and automated fault diagnostics across field devices. It is an ideal solution for remote machine junction boxes, conveyor drop stations, and tight enclosures where space and installation speed are critical.

Key Technical Specifications

Application Scenarios & The “Trench” Experience

It is 1:30 AM on a fast-paced bottling line. A palletizer wrapper station drops offline due to a shorted solenoid wire on output channel 3. On traditional block modules, a shorted output blows a physical glass fuse, shutting down all 8 channels and requiring panel disassembly. With the 1734D-IB8XOB8E, the electronic fusing isolates only channel 3 while sending a short-circuit diagnostic flag over DeviceNet to the CompactLogix PLC. The maintenance tech fixes the crushed wire, resets the electronic fuse via software (or power cycle), and gets the line back up in under 5 minutes without opening a single fuse holder.

• Conveyor Sorting & Material Handling – Remote Sensor/Actuator Nodes – Collects photo-eye inputs and fires pneumatic diverter valves right at the conveyor drop point.
• Automotive Assembly Cells – Fixture Clamping Control – Drives low-power 24V DC solenoid valves while monitoring proximity switch status over a single DeviceNet drop cable.
• Packaging Machines & OEM Skids – Distributed Valve Manifold Interface – Eliminates massive wire bundles running back to the main control panel.

1734D-IB8XOB8E

1734D-IB8XOB8E

Transparency SOP: Quality Assurance & Testing

We don’t just ship boxes; we bench-test every module on active network racks prior to dispatch.

1. Inbound Physical & Terminal Inspection: Checked the DIN rail latch mechanism, 5-pin DeviceNet connector pins, and removable terminal block (RTB) clamp alignment.
2. DeviceNet Node Address & Baud Test: Verified node rotary switches and RSNetWorx for DeviceNet online discovery at 125k, 250k, and 500k baud rates.
3. Live I/O Channel Stress Test: Applied 24V DC field power to verify input state toggling across all 8 inputs and driven 0.5A loads on all 8 output channels.
4. Electronic Fuse Short-Circuit Simulation: Intentionally shorted an output channel to verify instantaneous electronic trip execution, diagnostic LED indication, and clean auto-reset behavior.
5. ESD Protection & Packaging: Cleaned, sealed in antistatic shielding wrap, and packed inside custom shock-proof foam containers.

The Veteran’s Tech Trap Guide (Crucial Value-Add)

• ⚠️ DeviceNet Network Power vs. Field Power! The 1734D- requires two separate 24V DC power feeds: DeviceNet bus power (via the 5-pin network plug to power internal logic) and Auxiliary Field Power (wired to the module terminals to power connected sensors and actuators). Missing the field power connection will leave inputs/outputs dead while the network LED remains solid green!
• ❗ Understanding the Electronic Fusing (“E” Suffix) The “E” at the end of the part number denotes Electronically Fused outputs. When a short circuit or overcurrent occurs, the module shuts down that specific output channel to protect internal circuitry. Reset the faulted channel via software configuration or by cycling 24V auxiliary field power.
• ⚠️ Node Address (Mac ID) Configuration Address changes made via the front rotary switches or RSNetWorx require a power cycle (or DeviceNet network reset) to take effect. Always double-check node address conflicts before dropping a replacement unit onto an active DeviceNet trunk line.
• ❗ Terminal Block Keying Ensure the removable terminal blocks (RTBs) are properly seated and keyed. Pulling the RTB under full 24V DC load without removing field power can cause electrical arcing across the header pins.

Frequently Asked Questions (FAQ for Conversion)

Q: What is the difference between 1734D- and 1394/POINT I/O expansion slices? A: The 1734D- is a POINTBlock module—it is an all-in-one standalone block containing the DeviceNet adapter, power supply, and 16 I/O points. Standard 1734 POINT I/O modules are individual 2-channel or 4-channel slices that require a separate network adapter (like a 1734-ADN or 1734-AENT).

Q: Can I expand the 1734D- with additional 1734 POINT I/O slices? A: Yes! The 1734D- features a backplane interconnect on the right side, allowing you to snap on additional standard 1734 POINT I/O modules (up to the backplane expansion limit) to extend your I/O count on the same DeviceNet node.

Q: What does the “X” in stand for? A: The “X” indicates that the module contains a combination of both inputs (“IB8” = 8 Sink/Source Inputs) and outputs (“OB8E” = 8 Electronically Protected Outputs) within a single housing block.

Q: Are these modules brand new from Allen-Bradley? A: We stock both New Surplus (unused original packaging) and fully bench-tested, certified refurbished original Allen-Bradley 1734D- modules.

Q: What warranty comes with this POINTBlock module? A: Every Allen-Bradley 1734D- module comes with a full 12-month replacement warranty. If any input, output, or network communication circuit fails under normal operating conditions within one year, we replace it immediately from stock.