Allen-Bradley 1734-EP24DC Replacement for POINT I/O

Product Overview

Allen-Bradley 1734-EP24DC Replacement for POINT I/O: Smooth Migration from Legacy Power Distribution

The Allen-Bradley 1734-EP24DC is a 24 VDC expansion power supply module designed for use within the POINT I/O platform — one of the most widely deployed distributed I/O architectures in modern industrial automation. As facilities transition away from aging control infrastructure, the 1734-EP24DC serves as a direct, drop-in replacement for failed or end-of-life power supply segments within existing 1734 adapter-based I/O assemblies. Whether you are maintaining a legacy system or executing a phased migration toward a newer ControlLogix or CompactLogix architecture, this module provides the electrical isolation and current capacity needed to sustain uninterrupted field device operation.

The 1734-EP24DC supplies 24 VDC power to downstream POINT I/O modules mounted on the same DIN rail segment, effectively extending the power bus without requiring a separate external power rail. Each expansion power supply supports up to 4 A of continuous output current, making it suitable for segments populated with digital input modules such as the 1734-IB8 or 1734-IB16, digital output modules such as the 1734-OB8E, and analog I/O modules including the 1734-IE4C and 1734-OE4C. When replacing a failed 1734-EP24DC in a live system, no rewiring of field signal cables is required — the module slots directly into the existing DIN rail mount and connects to the adjacent I/O module via the integrated side-bus connector.

In retrofit and modernization projects, the 1734-EP24DC is frequently deployed alongside the 1734-AENT or 1734-AENTR EtherNet/IP adapter modules, which serve as the communication gateway between the POINT I/O segment and the upstream ControlLogix L7x or L8x controller. Facilities migrating from older DeviceNet-based I/O architectures — previously managed through 1734-ADN adapters — will find that the power supply module’s physical footprint and DIN rail mounting remain unchanged, simplifying the transition to EtherNet/IP without requiring control cabinet redesign. The 24 VDC input specification is also compatible with standard Rockwell Automation power supplies such as the 1606-XLP series, ensuring that existing cabinet power infrastructure can be retained during the upgrade.

For sites decommissioning older SLC 500 or MicroLogix 1500 systems and consolidating I/O onto a POINT I/O platform managed by a CompactLogix L3x controller, the 1734-EP24DC provides the segment power isolation necessary to partition field devices by functional area — separating safety-critical outputs from general-purpose inputs at the power bus level. This approach reduces the risk of a single power fault cascading across the entire I/O assembly, a common concern during brownfield upgrades where field wiring is retained from the original installation.

Installation requires no special tooling. The module is inserted from the left side of the I/O segment and locked into position using the integrated DIN rail latch. Commissioning is immediate upon power-up — no firmware configuration, no RSLogix 5000 or Studio 5000 tag mapping, and no EDS file registration is required for the power supply itself. This makes the 1734-EP24DC one of the lowest-risk components to replace during a scheduled maintenance window or emergency repair, with typical swap time under five minutes for a trained technician.

Procurement teams evaluating replacement stock should note that the 1734-EP24DC is compatible across all generations of the POINT I/O platform, including early-generation 1734-APB and 1734-ACNR adapter variants. This backward compatibility makes it a reliable stocking item for facilities operating mixed-generation POINT I/O assemblies across multiple production lines or remote field panels. Units are shipped with full functional testing completed, and each module is covered by a 12-month warranty from the date of shipment.

Compatibility Comparison Table

Seamless Upgrade Solutions

A complete POINT I/O migration or expansion project typically involves more than a single power supply replacement. In most retrofit scenarios, the 1734-EP24DC is installed alongside a 1734-AENTR EtherNet/IP adapter to modernize the communication backbone from legacy DeviceNet or ControlNet to a standard EtherNet/IP topology. Digital I/O modules such as the 1734-IB8S (safety input) or 1734-OB8E (sourcing output) are commonly added to the same segment to expand field device capacity without increasing cabinet footprint. For analog signal conditioning, the 1734-IE4C current input module and 1734-OE4C current output module are frequently specified in the same purchase order as the power supply, since analog segment power budgets must be recalculated when expansion supplies are added or repositioned.

In projects where the upstream controller is being upgraded from a MicroLogix 1500 to a CompactLogix 5380, the 1734-EP24DC power supply remains unchanged — only the adapter module and Ethernet infrastructure require updating. Similarly, facilities replacing aging 1606-XL240E-3 power supplies in the control cabinet with the newer 1606-XLP240E will find that the 24 VDC bus voltage and current capacity remain fully compatible with the 1734-EP24DC’s input specification. For multi-segment I/O assemblies, a 1734-TOP terminator cap is required at the end of each DIN rail segment, and its availability should be confirmed alongside the power supply order to avoid commissioning delays.

Retrofit Guidance FAQ

Q: Can the 1734-EP24DC replace a failed power supply in a live POINT I/O segment without rewiring field cables?
A: Yes. The module uses a side-bus connector that interfaces directly with adjacent I/O modules. Field signal wiring connected to downstream modules is not disturbed during replacement.

Q: Is any Studio 5000 or RSLogix 5000 configuration required after installing the 1734-EP24DC?
A: No. The expansion power supply is transparent to the controller and adapter. No tag changes, EDS file updates, or I/O tree modifications are required.

Q: Is this module compatible with both EtherNet/IP and DeviceNet POINT I/O adapters?
A: Yes. The 1734-EP24DC is protocol-agnostic and compatible with all POINT I/O adapter variants, including 1734-AENT (EtherNet/IP), 1734-ADN (DeviceNet), and 1734-ACNR (ControlNet).

Q: What is the maximum number of 1734-EP24DC modules that can be used in a single POINT I/O assembly?
A: Rockwell Automation specifies a maximum of 63 I/O modules per adapter, with expansion power supplies inserted as needed to maintain segment current budgets. Consult the 1734 POINT I/O Selection Guide (Publication 1734-SG001) for segment power calculations.

Q: Can this unit be used in a SIL 2 safety application?
A: The standard 1734-EP24DC is not a safety-rated module. For safety I/O segments, the 1734-EP24DCS safety expansion power supply is required.

Warranty Assurance

Every 1734-EP24DC unit shipped by TOPNLMS undergoes pre-shipment functional testing to verify input voltage acceptance, output current delivery, and side-bus connector integrity. Units are packaged in anti-static protective packaging with individual serial number documentation. A 12-month warranty is provided from the date of shipment, covering manufacturing defects and functional failures under normal operating conditions. Warranty claims are processed within 3 business days of receipt of the returned unit, with replacement shipment or credit issued upon confirmation of the defect. For urgent replacement requirements, expedited shipping options are available to minimize production downtime. Contact our technical sales team to confirm stock availability, lead time, and export compliance documentation requirements before placing your order.