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1756HP-TIME模块ACS880-01-061A-3议价
1756HP-TIME模块ACS880-01-061A-3议价
1756HP-TIME模块ACS880-01-061A-3议价
1756HP-TIME 系统中的各功能模块在纳入时间、激活机制和控制方式等方面可以不相同。
1756HP-TIME 纳入时间
纳入时间是指一个功能模块被归并到软件的源语言描述之中的时间。比如宏功能模块是由编译器把它作为程序的一部分直接插入到引用位置上去的。而普通的子程序则是通过产生目标代码与连接代码而纳入到软件中的。
1756HP-TIME 激活机制
功能模块的激活机制通常有两种:一个是通过引用来调用功能模块,另一个是通过中断来调用一个功能模块。在实时系统中,通常使用后者。比如,使用一个外部时间来引起处理过程的中断,然后使控制转到另一个功能模块。
1756HP-TIME 控制方式
一般功能模块具有单一入口和单一出口,并作为程序的一部分顺序地执行,有时,也需要更为复杂的控制方式,如可重入功能模块。这种功能模块不以任何方式修改它自己或它所访问的局部地址,从而这样的功能模块就可以同时被几个任务使用。
1756HP-TIME 结构分类
在软件结构中,功能模块可以分为以下几类:
顺序功能模块:它在没有明显中断情况下被应用软件调用和执行。
增量功能模块:它在调用结束之前可以被应用程序中断,然后在中断点重新启动。
并行功能模块:它在并行多处理机环境中与别的功能模块同时执行。
Each functional module in the system can be different in terms of inclusion time, activation mechanism and control method.
1) Inclusion time
Incorporation time refers to the time when a functional module is incorporated into the source language description of the software. For example, the macro function module is directly inserted into the reference location by the compiler as part of the program. Ordinary subroutines are incorporated into the software by generating object code and connection code.
2) Activation mechanism
There are usually two activation mechanisms for function modules: one is to call a function module through a reference, and the other is to call a function module through an interrupt. In real-time systems, the latter is usually used. For example, use an external time to cause an interruption in the process and then transfer control to another functional module.
3) Control method
Generally, function modules have a single entrance and a single exit, and are executed sequentially as part of the program. Sometimes, more complex control methods are required, such as reentrant function modules. This functional module does not modify itself or the local addresses it accesses in any way, so such a functional module can be used by several tasks at the same time.
4) Structural classification
In the software structure, functional modules can be divided into the following categories:
Sequential function module: It is called and executed by the application software without obvious interruption.
Incremental function module: It can be interrupted by the application before the call ends and then restarted at the interruption point.
Parallel function module: It executes simultaneously with other function modules in a parallel multi-processor environment.
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