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The PW401 is a rail-mounted power supply module for YOKOGAWA I/O backplanes, operating as a primary electrical source for field nodes and terminal cards. The unit accepts a universal input voltage range from 100 to 240 VAC at 50/60 Hz, converting it into a stable +24 VDC continuous output with a maximum current capacity of 5A and a 120W power rating. It features an electrical structure with typical full-load efficiency exceeding 85%, which limits internal thermal dissipation inside the enclosed control cabinet.
Hot-swappable dual-redundant operation
Compatible with YOKOGAWA I/O backplanes
Integrated diagnostics and alarm output
This hardware features a multi-compatible power input terminal block that accepts alternating current (VAC) inputs from 100V to 240V, as well as direct current (VDC) loops from 12V to 24V. This allows it to interface directly with different regional and national standard industrial grids, adapting to diverse on-site power distribution systems.
The exterior casing complies with the IP20 protection class standard, meaning the mechanical structure effectively prevents solid foreign objects with a diameter greater than 12.5mm (such as fingers or large tools) from accidentally touching internal live circuits. Its physical packaging is optimized for control cabinet rack installation, maintaining a stable physical structure in workshop environments dense with dust and mechanical vibration.
It features a built-in standard RS-485 serial communication interface and provides full support for the Modbus RTU communication protocol. Through this data bus, the module transmits its real-time voltage and current data, along with internal working conditions, to existing on-site host computers, SCADA systems, or programmable logic controllers (PLCs), achieving remote digital monitoring.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Yokogawa PW401 Power Supply Unit Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Petroleum Refining
Supplies power to atmospheric and vacuum distillation control racks, ensuring continuous transmission of transmitter signals.
Thermal Power Plants
Deployed inside boiler control system (DCS) racks to energize steam turbine control loops and bus cards.
Large-Scale Water Treatment
Outputs stable current to DCS nodes across chemical dosing stations, filtration basins, and central communication racks.
Iron & Steel Blast Furnaces
Delivers uninterrupted DC power to the primary control nodes governing blast furnace hot blast temperatures and stove switching valves.
Pulp & Paper Production Lines
Provides direct electrical power to the bus communication modules of paper machine web thickness and moisture monitoring systems.
Ore Beneficiation & Milling
Supplies hardware-level electricity to distributed I/O nodes for large ball mill and flotation machine control systems.
When installing and maintaining the PW401, insertion or removal from the rack must be performed only after cutting off the main power supply of the control cabinet, unless a 1:1 dual-redundant topology is configured for online hot-swapping.
Strictly maintain a ventilated ambient temperature of 0–55°C inside the cabinet during operation, and periodically clean accumulated dust from the module and backplane pins to prevent poor contact.
Because this hardware outputs high current, the input terminals and rack-locking screws must be securely tightened to prevent localized overheating or voltage drops.
Alternative Names
Alternative Names
PW40IPW4O1PW4OI
Technical notes
Technical notes
PW401 supports 1:1 or 1:N dual-redundant configurations for critical system availability, enabling hot-swappable replacement without interrupting the power bus distribution. The hardware integrates autonomous diagnostic circuitry that monitors output conditions, linking directly to a dedicated physical alarm output terminal for fault reporting. Built-in protection layers shield the module against over-current, over-voltage, and direct output short-circuits within an operating temperature range of 0°C to +55°C.
It is an industrial-grade, rack-mounted power supply module dedicated to Yokogawa's CENTUM series Distributed Control Systems (DCS).
What is the maximum continuous output current supported by the PW401 module?
Under standard hardware specifications, it delivers a maximum continuous output current of 20 A.
Where is the PW401 module typically installed?
It is inserted directly into the I/O node racks or dedicated power supply backplane slots of the Yokogawa DCS system.
What is the primary purpose of using the PW401 in a control system?
It converts plant AC power into low-voltage DC power to provide foundational electricity for control cards, I/O modules, and bus communications on the rack.
How to replace a faulty PW401 online?
Provided that a redundant power configuration is in place, a faulty module can be replaced online via hot-swapping without cutting off the main system power.
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Disclaimer: We are not an authorized distributor or distributor of the product manufacturer of this website, The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because our company is not an authorized distributor of this product, the Original Manufacturer`s warranty does not apply.While many DCS PLC products will have firmware already installed, Our company makes no representation as to whether a DSC PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. Our company also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from our company, its distributors, or any other source. Our company also makes no representations as to your right to install any such firmware on the product. Our company will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.
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