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I don't know the display you indicate, but by doing a quick search on Google I seem to understand that it is a classic parallel interface display. An I2C to parallel interface has probably been mounted on yours. In this case the I2C commands are not the same as those reported in this topic, I suggest you take a look at this topic.
As for the visualization of the value on the display, the display management FB, as you can see, allows you to transfer data from a string variable to the display. Now it will be enough to correctly compose the data in the string variable to have them shown on the display. To display the value of a counter use the function SysVarsnprintf.
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