Actual values depend on the total performance of your controller application (for example, the communication task responsible for data exchange is executed with a low priority).įor data exchange using the Machine Expert protocol via Ethernet, this chapter indicates the number of variables allowed to achieve a good data transmission performance. This chapter provides reference values that have been achieved under optimum conditions. Therefore, the time that is required to display the values on the HMI panels when a controller-HMI-connection is established, as well as to the refresh time of the variables, are affected accordingly. The communication speed between controller and HMI depends largely on the number of variables that are exchanged. Communication Performance on Controller - HMI Data Exchange
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