主动式I/O模块在高速工控场合的应用

Active I/O Module and its Application in Real-time Industry Control System

I/O板卡是PC-BASED类型工控应用中重要的外围设备。传统的I/O板卡功能单一,其用户态下的操作受到操作系统影响而具有不确定性。另外,其编程方法中对ISR的应用有一些局限,而其中断延迟在一些超高速的工控场合仍然无法满足要求。针对传统I/O板卡的局限性,提出"主动式"I/O模块的概念,描述其系统结构,讲解提高系统实时性能的机制。

I/O board is an important peripheral of PC- BASED control system, conventional I/O board has some shortage in real - time industry control system： the operation time to it may be affected by the OS, the usage of ISR to it has some limits, the ISR delay can＇t meet some hard real- time cases. The paper introduce the active I/O module ,describe the construction of it and explain how it enhance the real - time performance of control system.