恒定扫描定时器当系列90-30 PLC运行于恒定定时扫描(CST)方式下,恒定扫描定时器用来控制一程序扫描的长度。在这种运行方式下,每次扫描将耗相同时间朵。特别是,对于大多数应用程序，其输人扫描、应用程序逻辑扫描和输出扫描并不完全要求每次扫描过程的执行时间相同。恒定扫描定时器的时间值可用编程器来设置,其时间范围为5至监控定时器值(缺省值为00ms)。

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