Signal pairing for module expansion of a failsafe computing system

Signal pairing for module expansion of a failsafe computing system is disclosed. A system includes a central processing unit (CPU), a first input/output (I/O) module, and a second I/O module. The first I/O module includes a first module health controller operatively connected to the CPU. The second I/O module includes a second module health controller operatively connected to the first module health controller and the CPU. One of the first module health controller and the second module health controller is configured to assert a paired module health signal to the CPU indicating that the firstI/O module and the second I/O module are healthy. 本发明公开了种用于故障安全计算系统的模块扩展的信号配对。种系统包括：中央处理单元(CPU)、第输入/输出(I/O)模块、以及第二IO模块。第I/O模块包括可操作地连接至CPU的第模块健康控制器。第二I/O模块包括可操作地连接至第模块健康控制器和CPU的第二模块健康控制器。第模块健康控制器和第二模块健康控制器中的个被配置为断言配对的模块健康信号，配对的模块健康信号指示第I/O模块和第二I/O模块是健康的。