Sometimes, the selection logic is programmed based on corporate policies, but more frequently, the preference is specified by the user.
有时候，选择逻辑的编程建立在公司策略之上，但更常见的是用户指定其喜好。
For example, switching logic can be defined to have the return fan start after a programmed delay from the time that the supply fan was started.
比如一个切换逻辑可以用来定义一个风机的开起，当程序定时过后，风机起动。
They are the one's that can be programmed and reconfigured the logic functions while on the system board which is suitable for faster prototyping.
它支持在系统编程，在系统重构器件的逻辑功能，很适合产品的样机开发。
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