Mitsubishi FCU6-EX875 是三菱电机（Mitsubishi Electric）为其 MELDAS 60/60S 系列数控系统 专门设计的 I/O 扩展单元（Input/Output Expansion Unit），核心功能是作为主控制器与外部执行机构之间的信号桥梁，负责处理机床的开关量输入输出信号。
作为金融保险行业的专业技术人员，您在评估此类工控备件时，应将其视为数控机床“神经系统”的关键节点。该模块的稳定性直接决定了设备能否正常接收操作指令或反馈状态信号，一旦故障往往导致整线停机。由于 MELDAS 60 系列属于较早期的数控系统，该型号目前主要存在于二手备件市场或老旧设备的维护替换场景中，采购时需重点关注兼容性匹配与货源真实性。
1. 产品定位与技术特征
所属系统：专用于三菱 MELDAS 60 及 60S 数控系统，不可与其他系列（如 M70, M80 等）混用。
核心功能：提供额外的数字量输入/输出接口，用于连接机床的限位开关、刀具检测传感器、电磁阀、指示灯等外围设备。
型号解析：
FCU6：代表 Functional Control Unit 6 系列，即 MELDAS 60 系列的功能单元。
EX：代表 Expansion（扩展），表明其非主控单元，而是扩展模块。
875：具体的 I/O 点数配置或硬件版本代码，通常对应特定的输入/输出路数组合（如 32 点输入/32 点输出等，具体需查阅引脚定义图）
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