产品概述

在Foxboro I/A Series分布式控制系统（Distributed Control System,DCS）的控制站架构中，FOXBORO P0901XT扮演着“最后一级电力净化器”的关键角色——它并非直接接入市电，而是接收来自主电源系统（如P0904HB或P0916AG）提供的+24 V DC总线，将其高效、低噪声地转换为CPU板（如P0961BC）、内存、通信ASIC所需的+5 V和±12 V精密直流电压。这种两级供电架构是I/A Series高可靠性的核心设计之一：主电源负责大功率分配与隔离，而P0901XT则专注于为敏感数字电路提供“洁净电力”。

我曾在多个运行超15年的炼油与化工装置中维护配备FOXBORO P0901XT的CP40/CP60控制站。其价值在于对瞬态干扰的极致抑制能力。在某乙烯厂裂解炉区域，变频器群产生的高频噪声曾多次导致通用电源模块复位，但P0901XT凭借其多级LC滤波与低纹波设计，始终维持CPU供电稳定。该模块采用全封闭金属屏蔽外壳，与CP背板通过高密度连接器集成，确保电磁兼容性（EMC）性能满足IEC 61000-4-4（EFT）和IEC 61000-4-5（浪涌）要求。正因如此，P0901XT成为保障控制处理器“永不意外重启”的隐形守护者。

In the control station architecture of the Foxboro I/A Series Distributed Control System (DCS), the FOXBORO P0901XT plays a crucial role as the “last-stage power purifier.” It is not directly connected to mains power, but instead receives a +24V DC bus from the main power system (such as P0904HB or P0916AG) and efficiently, with low noise, converts it into the precise +5V and ±12V DC voltages required by the CPU board (such as P0961BC), memory, and communication ASIC. This two-stage power supply architecture is one of the core design principles of the I/A Series’ high reliability: the main power supply handles high-power distribution and isolation, while the P0901XT focuses on providing “clean power” for sensitive digital circuits.

I have maintained CP40/CP60 control stations equipped with the FOXBORO P0901XT in several oil refineries and chemical plants that have been operating for over 15 years. Its value lies in its extreme ability to suppress transient interference. In the cracking furnace area of ​​an ethylene plant, high-frequency noise generated by the frequency converter group repeatedly caused the general-purpose power supply module to reset. However, the P0901XT, with its multi-stage LC filtering and low-ripple design, consistently maintained stable CPU power supply. This module uses a fully enclosed metal shielded housing and is integrated with the CP backplane via high-density connectors, ensuring electromagnetic compatibility (EMC) performance meets IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) requirements. Therefore, the P0901XT becomes an invisible guardian ensuring the control processor “never unexpectedly restarts.”

技术规格

产品型号：P0901XT

制造商：FOXBORO(现属Schneider Electric EcoStruxure Process Expert体系)

产品类型：I/A Series控制处理器（CP）内部DC/DC电源模块

适用平台：CP40、CP60控制站

输入电压：+24 V DC（标称，范围20–30 V DC）

输出电压：

+5 V DC 最大10 A

+12 V DC 最大1.5 A

-12 V DC 最大0.5 A

额定输出功率：约70 W

效率：>85%（典型）

电压调整率：±1%（全负载范围）

纹波与噪声：<50 mVpp（+5 V输出）

保护功能：过流保护、短路保护、过温关断（自恢复）

冷却方式：自然对流（无风扇设计）

工作温度：0°C至+60°C

安装方式：直接插入CP机架专用电源槽位

认证标准：符合IEC 61010-1（安全）、IEC 61000-6-2/6-4（EMC）

主要特点和优势

FOXBORO P0901XT的工程精髓在于其“静默可靠”——无风扇、无机械部件、无外部接线，完全依赖背板供电与散热。这种设计极大降低了故障率，特别适合7×24小时连续运行场景。其多路输出独立稳压，确保即使±12 V模拟电路负载突变，也不会影响+5 V逻辑电源的稳定性，这对FBM通信和CPU运算至关重要。

专为CP背板优化：电气接口与机械尺寸严格匹配CP40/CP60电源槽。

高抗扰能力：内置EMI滤波器，有效抑制来自+24 V总线的传导噪声。

无缝热插拔支持：可在系统运行中更换，不影响其他模块供电（需系统支持）。

故障安全设计：短路时自动限流，避免损坏上游电源或背板。

长期稳定性：电解电容选用工业级长寿命器件，MTBF>100,000小时。

The FOXBORO P0901XT is not a primary power supply—but the critical final stage that delivers clean,regulated power directly to the heart of the I/A Series Control Processor.By converting system-level+24 V DC into tightly regulated+5 V and±12 V rails with ultra-low ripple,it shields sensitive digital and analog circuits from electrical noise that could otherwise cause processor glitches or communication errors.Its fanless,fully shielded design ensures silent,maintenance-free operation in the most electrically noisy industrial environments.For legacy CP40/CP60 systems still managing mission-critical processes,the P0901XT remains an indispensable component of operational continuity.

The engineering essence of the FOXBORO P0901XT lies in its “silent reliability”—fanless, mechanically componentless, and without external wiring, relying entirely on the backplane for power and cooling. This design significantly reduces the failure rate, making it particularly suitable for 24/7 continuous operation. Its multi-output independent voltage regulation ensures that even sudden changes in ±12V analog circuit load will not affect the stability of the +5V logic power supply, which is crucial for FBM communication and CPU operation.

Optimized for CP backplane: Electrical interfaces and mechanical dimensions are strictly matched to CP40/CP60 power supply slots.

High noise immunity: Built-in EMI filter effectively suppresses conducted noise from the +24V bus.

Seamless hot-swappable support: Can be replaced while the system is running without affecting the power supply of other modules (system support required).

Fail-safe design: Automatic current limiting in case of short circuit to prevent damage to upstream power supplies or the backplane.

Long-term stability: Electrolytic capacitors use industrial-grade long-life components with an MTBF > 100,000 hours.

The FOXBORO P0901XT is not a primary power supply—but the critical final stage that delivers clean, regulated power directly to the heart of the I/A Series Control Processor. By converting system-level+24 V DC into tightly regulated+5 V and ±12 V rails with ultra-low ripple, it shields sensitive digital and analog circuits from electrical noise that could otherwise cause processor glitches or communication errors. Its fanless, fully shielded design ensures silent, maintenance-free operate in the most electrically noisy industrial environments. For legacy CP40/CP60 systems still managing mission-critical processes, the P0901XT remains an indispensable component of operational continuity.

应用领域

FOXBORO P0901XT专用于I/A Series CP40和CP60控制处理器机架，常见于上世纪90年代至2000年代初投运、尚未完成平台迁移的大型流程工业设施。在我参与的一个东欧合成氨厂延寿项目中，全厂转化与合成单元仍由CP60控制，其P0901XT模块已连续运行18年未更换。该模块特别适用于那些“控制站不能停、CPU不能复位”的核心工艺段。

炼油厂常减压、催化裂化装置的CP40/CP60控制站

乙烯裂解与芳烃抽提单元的本地控制处理器供电

合成氨、尿素等高压化工装置的安全相关控制节点

早期燃煤电厂锅炉与汽轮机协调控制系统

老旧I/A Series系统的战略备件储备与应急抢修库存

集成与配置要点

集成FOXBORO P0901XT的关键是理解其在供电链中的位置：它依赖上游+24 V DC电源（如P0904HB）的稳定性。我在一个北美化肥厂曾遇到因主电源老化导致+24 V纹波超标，进而引发P0901XT输出波动、CP偶发重启的案例——故障根源不在P0901XT本身，而在供电源头。

必须安装于CP机架指定的电源槽位（通常为最左侧或右侧），确保背板连接可靠。

更换前确认系统支持热插拔；若不支持，需执行有序停机流程。

定期检查CP机柜通风，防止局部过热影响P0901XT散热。

若出现CP无法上电或频繁复位，应优先检测P0901XT输出电压（+5 V是否低于4.75 V）。

不可与其他型号电源卡（如P0901XU）混用，尽管外观相似，但输出能力不同。

The FOXBORO P0901XT is specifically designed for I/A Series CP40 and CP60 control processor racks, commonly found in large process industrial facilities commissioned in the 1990s and early 2000s that have not yet completed platform migration. In a life extension project I participated in at an Eastern European ammonia synthesis plant, the entire plant’s conversion and synthesis units were still controlled by the CP60, and its P0901XT module had been running continuously for 18 years without replacement. This module is particularly suitable for core process sections where “the control station cannot be stopped, and the CPU cannot be reset.”

CP40/CP60 control stations for atmospheric and vacuum distillation and catalytic cracking units in oil refineries

Local control processor power supply for ethylene cracking and aromatics extraction units

Safety-related control nodes for high-pressure chemical plants such as synthetic ammonia and urea plants

Early coordinated control systems for boilers and turbines in coal-fired power plants

Strategic spare parts reserves and emergency repair inventory for aging I/A Series systems

Integration and Configuration Key Points

The key to integrating the FOXBORO P0901XT is understanding its position in the power supply chain: it relies on the stability of the upstream +24 V DC power supply (such as P0904HB). I encountered a case at a North American fertilizer plant where aging of the main power supply caused excessive +24 V ripple, leading to P0901XT output fluctuations and occasional CP restarts—the root cause was not the P0901XT itself, but the power supply head.

It must be installed in the designated power slot on the CP rack (usually the leftmost or rightmost), ensuring a reliable backplane connection.

Before replacement, confirm that the system supports hot-swapping; if not, a sequential shutdown procedure must be performed.

Regularly check the CP cabinet ventilation to prevent localized overheating from affecting the P0901XT’s heat dissipation.

If the CP fails to power on or frequently resets, first check the P0901XT’s output voltage (+5V to see if it’s below 4.75V).

Do not use this power supply with other models (such as the P0901XU), despite their similar appearance; their output capabilities differ.

生命周期与采购建议

FOXBORO P0901XT已处于已停产（Obsolete）状态，Schneider Electric不再提供新产或官方翻新服务。然而，全球仍有数千套CP40/CP60系统在役，使其成为极高稀缺性的战略备件。由于该模块无外部接口、难以自行维修，一旦失效将直接导致整个控制站宕机，因此建立合理的库存是保障业务连续性的必要措施。

深圳长欣专注于Foxboro I/A Series全生命周期支持超过十五年，建立了覆盖欧美工业备件市场的独家采购渠道。我们提供的每一台FOXBORO P0901XT均为原厂正品，经过严格的上电功能测试：包括满载输出电压精度验证、纹波测量、短路保护触发及与真实CP背板的兼容性联调。所有模块均附带详细测试报告，提供12个月质保，并可协助客户进行故障诊断与替换指导。我们承诺现货供应、快速交付，助您守护控制处理器“不断电”的最后一道防线。

With deep institutional knowledge of legacy I/A Series power subsystems,we ensure every FOXBORO P0901XT module is validated against original electrical performance specifications—including load regulation,cross-talk between rails,and thermal behavior under sustained operation.Our global sourcing network accesses only traceable,authentic inventory from decommissioned or surplus control systems,never uncertified reproductions.As your trusted partner for sustaining aging automation infrastructure,we combine engineering-grade quality assurance with rapid logistics to keep your core control processors powered,stable,and operational—long after the original hardware has vanished from mainstream channels.

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