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6ES7901.0BF00.0AA0 参数 Datasheet PDF下载

6ES7901.0BF00.0AA0图片预览
型号: 6ES7901.0BF00.0AA0
PDF下载: 下载PDF文件 查看货源
内容描述: SIMATIC HMI触摸屏TP 070 [SIMATIC HMI Touch Panel TP 070]
分类和应用:
文件页数/大小: 80 页 / 400 K
品牌: SIEMENS [ Siemens Semiconductor Group ]
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Communication Management for SIMATIC S7  
7.3  
Optimization  
Acquisition cycle and update time  
The acquisition cycles defined in the configuration software for the tags are major  
factors in respect of the real update times which can be achieved. The update time  
is the acquisition cycle plus transmission time plus processing time.  
In order to achieve optimum update times, the following points should be observed  
during configuration:  
S
Setting acquisition cycles which are too short unnecessarily impairs overall  
performance. Set the acquisition cycle to correspond to the modification time of  
the process values. The rate of change of temperature of a furnace, for  
example, is considerably slower than the acceleration curve of an electric  
motor.  
Guideline value for the acquisition cycle: Approx. 1 second.  
S
In order that changes on the PLC are reliably detected by the TP 070, they must  
occur during the actual acquisition cycle at least.  
Screens  
In the case of screens, the real uptate time which can be achieved is dependent on  
the type and quantity of data to be displayed.  
In order to achieve rapid update times, only configure short acquisition cycles for  
those objects actually need to be updated quickly.  
TP070 Equipment Manual  
Release03/00  
7-5  
 
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