YOKOGAWA PW701 Product Description

Product Overview

YOKOGAWA PW701 is a dedicated power supply module for Yokogawa industrial control systems, primarily associated with the CENTUM CS/CENTUM VP Field Control Station (FCS) architecture. Available industrial automation references identify PW701 as a power supply module for the FCS, with a 100–120 VAC input configuration.

The YOKOGAWA PW701 provides the regulated electrical power required by control-system electronics, helping maintain stable operation of processor, I/O and associated FCS components. As a system power module rather than an I/O or communication card, its reliability directly affects the availability of the overall DCS control station. For legacy Yokogawa installations, PW701 is therefore an important maintenance and replacement component where preserving the original CENTUM control architecture is preferred.

Technical Specifications

A commercial technical reference specifically identifies PW701 as model type AS S9151DC-04 and states that it is a power supply module for the Field Control Station with 100–120 VAC input.

Some third-party listings publish conflicting output specifications for PW701, including +5.1 VDC/29 A. Because these sources disagree substantially on electrical parameters, those values should be verified against the original Yokogawa manual and module nameplate before engineering replacement.

Main Features and Advantages

Dedicated FCS Power Supply

The YOKOGAWA PW701 is designed specifically for industrial control-system power requirements. Rather than functioning as a general-purpose standalone power converter, it forms part of the Yokogawa FCS power architecture and supplies the stable DC power required by control electronics.

Stable System Operation

A reliable power module is fundamental to DCS availability. Fluctuations, overload conditions or loss of control-system power can affect processors, I/O interfaces and communication functions. PW701 provides the dedicated power-conversion stage required by compatible Yokogawa control hardware.

PW701

CENTUM System Compatibility

The module is associated with Yokogawa CENTUM CS and CENTUM VP systems and is used in Field Control Station applications. This makes the exact model important when maintaining an existing system, since a visually similar power module may have a different input/output configuration.

Industrial Rack Integration

PW701 is designed for installation within the control-system architecture rather than as a desktop or general-purpose power supply. Its rack-oriented construction allows it to integrate into established FCS cabinets while keeping power conversion physically close to the associated control electronics.

Maintenance Replacement Value

For long-running DCS installations, retaining an exact PW701 spare can reduce recovery time after a power-module failure. It can also help avoid unnecessary modification of existing cabinet wiring, system configuration and control-station architecture.

Suitable for Continuous-Duty Control

The module is intended for industrial automation environments in which the control system must operate continuously. This makes it particularly relevant to process industries where unexpected FCS power loss can interrupt monitoring, regulation and plant-level control functions.

Application Fields

YOKOGAWA PW701 is primarily used in process-control installations based on Yokogawa CENTUM architecture, particularly Field Control Stations requiring compatible system power hardware. Its role is fundamental because the FCS depends on stable power for processors, I/O modules and associated control electronics.

In chemical and petrochemical plants, PW701 can support FCS cabinets responsible for process measurement, control-loop execution and field-device interfacing. Reliable power helps maintain continuous operation of control functions in processes where an unexpected controller shutdown can result in significant production disruption.

In oil and gas facilities, the module can form part of established Yokogawa DCS cabinets used for gathering, processing and monitoring operations. Maintaining the original power architecture is especially useful for legacy facilities where complete DCS migration would be costly and disruptive.

In power generation, metallurgy and large-scale manufacturing, PW701 can support CENTUM-based FCS installations responsible for distributed process control. It is also relevant to maintenance inventories because power-supply failures can affect an entire control station even when the processor and I/O modules themselves remain functional.

For replacement work, technicians should confirm the complete PW701 designation, input voltage, FCS configuration and module revision before installation. The available secondary sources contain inconsistent electrical specifications, so the original Yokogawa documentation and installed nameplate should take priority.

Related Products

• PW701 — Dedicated Yokogawa FCS power supply module; the main product described above.
• PW301 — Yokogawa power supply module for related control-system applications, with a different electrical configuration.
• PW302 — Related Yokogawa power-supply module used in compatible control architectures.
• PW401-S2 — Yokogawa power supply module with a different input/output configuration; not automatically interchangeable with PW701.
• PW402-S2 — S2-style Yokogawa power module for compatible control-system configurations.
• PW482-10 — Yokogawa power supply module for 220–240 VAC applications and therefore a different voltage class.
• PW441-50 — Yokogawa V-Net power supply module used for a different system function.
• PW501 — Yokogawa power supply module associated with optical bus repeater component units.
• PW502 — Yokogawa power supply for repeater applications.