1783-MX08S
1783-MX08S
1783-MX08S
通常,OPC服务器与大量的RTU进行通信,且仅共享一条通信信道。OPC服务器首先与一台RTU连接,获取设备运行参数,之后,断开连接;接着,按照采样顺序与另一台RTU连接,获取数据,断开连接;如此循环。OPC服务器与RTU的连接和断开操作,反映在服务器运行上,表现为系统进程的创建和销毁,这需要一定的CPU开销。当OPC服务器与大量的RTU进行通信时,这种开销对系统的运行产生重大的影响,甚至引起系统的崩溃。因此,OPC服务器的设计应该采用多线程技术。同时,可以选择多处理器系统以增强系统的并发处理能力。
线程是以线程包的形式提供的。线程包中包含有创建和销毁线程的操作。于是,用户线程的管理工作都是在用户空间中进行的。线程创建和销毁的主要开销是为线程堆栈建立而分配内存以及释放线程堆栈所占用的内存。而且,如果需要进行线程间的同步,只需将要同步线程保存的CPU寄存器的值***到相应的寄存器。只需几条指令就可以实现。这些开销相比于进程的创建、销毁以及进程间同步要小得多。
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厦门泰尼电气有限公司
【产品质量】原装进口***
【检测标准】按原厂标准
【产品质保】 1 年
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& 洽谈电话 : 0592-6809319/ 18950191386
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