How to calculate the running time of terminal equipment (such as water pump) during TIA Bo (attached with FB library file)?

How to be in TIA Bo en route computing terminal equipment ( For example, water pump ) Running time of （ attach FB The library files ）？

In order to calculate the running time of terminal equipment , You can read CPU And calculate the difference between the two times .

STEP 7 (TIA Portal) Two extension instructions are provided "RD_SYS_T" ( Read time ) and “T_DIFF” ( Time difference ). The calculated time output is the difference between the read data , That is, the running time of the equipment .

As shown in the figure below , by SCL Detailed program of language ：

When the input parameter “startTime" The signal is "0”, The first condition is met , The first order "RD_SYS_T" Will be performed ;

When the input parameter “stopTime" The signal is "0”, The second condition is met , The second order "RD_SYS_T" Will be performed .

The picture below shows OB "Main" Call in FB "Timedifferent" Example ：

Instructions for measuring the running time of terminal equipment ：
step 1࿱