Allen-Bradley 1746-P5 Industrial Power Supply: Backbone of SLC 500 Data Link Architecture
The Allen-Bradley 1746-P5 is a high-reliability DC power supply module engineered for the SLC 500 programmable logic controller platform — one of Rockwell Automation’s most widely deployed control architectures in discrete manufacturing, process automation, and smart factory environments. Delivering stable 24 VDC output to the SLC 500 backplane, the 1746-P5 ensures uninterrupted power to every I/O module, communication adapter, and processor card within the chassis, forming the electrical foundation upon which industrial data networks depend.
In modern industrial connectivity deployments, power integrity is inseparable from network stability. The 1746-P5 supports continuous operation of the SLC 5/05 Ethernet processor, enabling real-time EtherNet/IP communication between field devices and supervisory systems. Whether the control node is exchanging tag data with a FactoryTalk View SE SCADA server, synchronizing setpoints with a PanelView Plus HMI terminal, or relaying I/O status to an upstream ControlLogix gateway, the 1746-P5 provides the regulated, noise-filtered DC power that keeps the data link alive and latency-free.
Network Communication Table
| Attribute |
Specification |
| SKU / Part Number |
1746-P5 |
| Brand / Manufacturer |
Allen-Bradley (Rockwell Automation) |
| Series |
SLC 500 |
| Module Type |
DC Input Power Supply |
| Output Voltage |
5 VDC (backplane) / 24 VDC (field) |
| Compatible Protocols |
EtherNet/IP, DH+, DH-485, DeviceNet (via adapter) |
| Interface Compatibility |
SLC 500 fixed and modular chassis (1746 series) |
| Network Architecture |
Rockwell Integrated Architecture, EtherNet/IP backbone |
| SCADA / HMI Integration |
FactoryTalk View SE, RSView32, PanelView Plus |
| System Application |
Discrete manufacturing, process control, smart factory I/O |
| Warranty |
12-Month Warranty |
| Availability |
In Stock — Ready to Ship |
Connected Automation Data Flow
The 1746-P5 sits at the heart of a layered industrial network where every milliwatt of stable power translates directly into milliseconds of reliable communication. In a typical SLC 500 control node, the 1746-P5 energizes the 1746-IB16 digital input module and 1746-OB16 digital output module, which gather discrete signals from proximity sensors, photoelectric detectors, and limit switches on the production line. These field signals are processed by the SLC 5/05 processor — the Ethernet-capable CPU that publishes real-time I/O data over EtherNet/IP to the plant network.
Upstream, a 1756-ENBT EtherNet/IP bridge module in a ControlLogix chassis aggregates data from multiple SLC 500 nodes, forwarding consolidated process variables to a FactoryTalk Historian server for long-term trending and OEE analysis. Simultaneously, a PanelView Plus 7 HMI terminal polls the SLC 5/05 for live status, displaying conveyor speeds, tank levels, and alarm states to floor operators. For legacy device integration, a 1761-NET-AIC Advanced Interface Converter bridges DH-485 networks — connecting older SLC 5/02 and SLC 5/03 nodes — into the broader EtherNet/IP architecture without requiring controller replacement.
Where field devices communicate over DeviceNet — including 1769-SDN scanner modules, variable frequency drives, and smart valve positioners — the 1746-P5-powered chassis acts as the stable power anchor that prevents brownout-induced network dropouts. In remote I/O applications, 1747-ASB remote I/O adapter modules extend the SLC 500’s reach to distributed chassis across the plant floor, all dependent on the consistent DC rail that the 1746-P5 maintains. Edge gateway devices, such as Rockwell’s Stratix 5700 managed industrial Ethernet switch, connect these distributed nodes into a unified, VLAN-segmented network topology — enabling SCADA visibility from the control room to every remote I/O drop.
Solving Data Isolation in Industrial Sites
One of the most persistent challenges in brownfield industrial facilities is protocol fragmentation: legacy SLC 500 systems running DH+ or DH-485 cannot natively exchange data with modern EtherNet/IP-based MES or SCADA platforms. The 1746-P5, by reliably powering SLC 500 chassis equipped with communication adapter modules such as the 1747-KE DH-485/RS-232 interface or the 1761-NET-ENI Ethernet interface, enables these legacy controllers to participate in plant-wide data networks without costly full-system replacement.
Data silos are broken down when the SLC 500 node — powered by the 1746-P5 — can publish real-time process data to a SCADA gateway, which then forwards structured datasets to cloud-based analytics platforms or MES dashboards. Remote diagnostics become possible: maintenance engineers can interrogate controller fault codes, I/O module status, and communication health from a central workstation or mobile device, dramatically reducing mean time to repair (MTTR) and unplanned downtime. Production line transparency improves as every sensor signal, drive status, and alarm event is captured, timestamped, and made available for root-cause analysis.
System scalability is another key advantage. The SLC 500 modular chassis architecture — powered by the 1746-P5 — allows engineers to add analog input modules for temperature and pressure monitoring, specialty communication modules for HART or Profibus integration, and additional I/O capacity as production requirements evolve, all without disrupting the existing network infrastructure. Every expansion slot added is a new data source feeding the plant’s digital twin.
All units supplied by ZYPLC undergo pre-shipment functional testing, verifying output voltage regulation, backplane communication integrity, and thermal performance under load. Each 1746-P5 ships with a 12-month warranty and is supported by our global inventory network for fast delivery to manufacturing sites worldwide.
Industrial Connectivity FAQ
Q1: Does the 1746-P5 support EtherNet/IP communication directly?
The 1746-P5 is a power supply module and does not itself handle communication protocols. However, it provides the stable DC power required for the SLC 5/05 Ethernet processor and EtherNet/IP adapter modules within the same chassis to maintain reliable, low-latency EtherNet/IP network communication.
Q2: Is the 1746-P5 compatible with both fixed and modular SLC 500 chassis?
Yes. The 1746-P5 is designed for use with the full range of 1746-series modular SLC 500 chassis. It is not compatible with SLC 500 fixed controllers (1747-L20, L30, L40), which have integrated power supplies. Always verify chassis slot count and power budget before installation.
Q3: How does power supply stability affect network communication reliability in SLC 500 systems?
Voltage fluctuations or ripple on the DC backplane rail can cause communication timeouts, I/O module faults, and processor resets — all of which interrupt data flow to SCADA and HMI systems. The 1746-P5’s regulated output minimizes these risks, ensuring consistent network uptime and data integrity across DH+, DH-485, and EtherNet/IP links.
Q4: What warranty and testing does ZYPLC provide with the 1746-P5?
Every 1746-P5 unit supplied by ZYPLC is functionally tested prior to shipment, covering output voltage accuracy, load regulation, and backplane interface integrity. A 12-month warranty is included, covering defects in materials and workmanship. Our inventory is maintained in-stock for rapid order fulfillment to minimize production downtime for our customers.
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