摘要
构成微机联锁现场总线控制系统的现场总线必须是故障安全的。利用集合论对故障安全现场总线的安全态、准危险态进行了定义，进而描述了它的故障安全特性，即在现场总线自身的故障或受到外界干扰的情况下能以极高概率实现现场总线的安全态。为了实现故障安全特性，必须采用避错、容错等高可靠技术和安全确认型故障安全技术。
The paper deals with the fieldbus control system used for railway computer interlocking (abbreviated as FSbus).After defining two states of FSbus,the safe state and the quasidangerous state,this paper describes the fail-safe characteristics of FSbus,i.e.,FSbus should kept in safe state in high probability regardless of its internal faults or external interference.High reliability techniques and fail-safe techniques should be adopted to achieve the fail-safe performance of FSbus.
关键词
控制设备
现场总线
故障安全
联锁设备
control equipments, fieldbus, fail-safe, interlocking equipment
