F6220

 HIMA F6220

咨询热线---18050036945

     PLC及其网络发展到现在，已经能够实现NBS或ISO模型要求的大部分功能，至少可以实现4级以下NBS模型或ISO模型功能。

    PLC要提供金字塔功能或者说要实现NBS或ISO模型要求的功能，采用单层子网显然是不行的。因为不同层所实现的功能不同，所承担的任务的性质不同，导致它们对通信的要求也就不一样。在上层所传送的主要是些生产管理信息，通信报文长，每次传输的信息量大，要求通信的范围也比较广，但对通信实时性的要求却不高。而在底层传送的主要是些过程数据及控制命令，报文不长，每次通信量不大，通信距离也比较近，但对实时性及可靠性的要求却比较高。中间层对通信的要求正好居于两者之间。

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厦门莫格电气自动化有限公司     
联系人：刘水仙（销售工程师）                                         
手   机：18050036945/0592-6808374
Q     Q：3443643092                        
邮    箱：3443643092@qq.com
传    真：0596-6514751（请备注刘工收)
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