Customers often complain that Siemens' slow communication between the panel and the PLC is actually caused by improper settings in many cases. Some of the settings listed below will affect the communication speed between the panel and the PLC.
1, the variable refresh cycle
In normal communication mode, the minimum refresh period that the panel can support is 100ms.
Is the shorter the setting, the faster the communication? This is basically the case when there are few variables. However, if there are many variables, it is not. Because a large number of communication tasks are executed far beyond the refresh cycle, communication will be blocked. The performance is that the communication speed will drop instead. Therefore, according to the actual needs of the project, the variable refresh cycle should be long and short.
For some special applications, such as direct keys. You can configure the panel as a DP slave. To ensure the rapid delivery of certain key data
2, variable acquisition mode
Variables have three acquisition modes, continuous cycle, cyclic use and command.
By default, we should set it up for recycling. This means that only when a variable is used in the current screen, the variable will be refreshed and the communication load will be generated. If it is incorrectly set to be continuous in the loop, regardless of whether the variable is used in the current screen, the panel will constantly refresh the variable in the background, thereby generating unnecessary communication load and reducing the overall communication speed of the panel.
A common application set to cyclic continuous mode is that this variable is configured with a numeric change event.
3, communication baud rate
Of course, the sooner the better, the premise is that the line quality is good, less interference or ground shielding and other measures properly. When the communication conditions are poor, a high baud rate results in a higher probability of communication failure, which in turn reduces the speed of successful communication. If the baud rate is reduced at this time, the probability of communication packet error will be reduced, thereby improving the communication speed.
4, the number of I/O fields in a single screen
Each panel will give the maximum number of configured objects in a single screen in the performance parameters, such as up to a few domains, up to a few variables, and up to a few complex objects. This is the limit parameter. The actual application of the project does not recommend that these parameters reach the limit unless the project is relatively simple and the communication variables are few. So, if possible, split the screen of multiple I/O domains into sub-pictures.
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