Saving memory word value once

[jmilliaan]

I have a simple counter that counts up every 1 second using a timer. How do I save the value of the counter when a button is pressed? I have tried this by assigning a new memory word value to be the same as the counter value. But because the counter always counts up every second, the memory word also changes every second. How can I save it only when the button is pressed, and it maintains its value. 

[VARFIC · Accepted solution]

Hi,

it is possible you provide a example or code you are working?

Before could you try using a public variable in your program?

Regards

[jmilliaan]

I'm trying to make a stopwatch program using ladder logic. I haven't figured out how to make the "lap" function found in stopwatches. Attached is my LD program, I use a timer that pulses every 1ms with preset 1000. The timer output is then connected to a the CU of a counter with preset 60 (indicating 1 minute). The preset reached of said counter is then connected to the CU of another counter with preset 60 (indicating 1 hour). 

I want to save the values of each counter when the lap button is pressed.