‌PCD235A101（订货号 3BHE032025R0101）是 ABB Unitrol 励磁系统中的 CIO（通用输入/输出）控制模块，

基于 AC800PEC 平台，专用于 10MW–1000MW 同步发电机的励磁控制。‌‌‌

‌硬件接口‌：含 3 路模拟输入（±10V/±20mA）、3 路模拟输出（±10V）、多路隔离 DI、16 路继电器 DO（250VAC/5A），支持工业以太网与 RS485（Modbus RTU）。

平台与冗余‌：属 ABB AC800PEC 系列，支持 1:1 硬件冗余（切换 ≤200ms），工作温度 -25℃~+70℃，IP20 防护。

PCD235A101 (order number 3BHE03205R0101) is the CIO (General Input/Output) control module in the ABB Unitrol excitation system,

Based on the AC800PEC platform, specifically designed for excitation control of synchronous generators ranging from 10MW to 1000MW. ‌‌‌

Core functions: Implement automatic voltage regulation (AVR), constant reactive power/power factor control, PSS (power system stabilizer) functions, support millisecond level closed-loop excitation regulation and multiple protections (overvoltage, overcurrent, overtemperature, communication interruption, etc.).

Hardware interface: including 3 analog inputs (± 10V/± 20mA), 3 analog outputs (± 10V), multi-channel isolated DI, 16 relay DO (250VAC/5A), supporting industrial Ethernet and RS485 (Modbus RTU).

Platform and Redundancy: Belonging to ABB AC800PEC series, supporting 1:1 hardware redundancy (switching ≤ 200ms), working temperature -25 ℃~+70 ℃, IP20 protection.