S7-300 robust timer

[kyoq]

Hi, I want to use 'robust timer' i.e. when timer is counting and the PLC is switched off and on the PLC 's timer will continue counting (not start counting from beginning) ?

 

[PeterW]

Create your own, count timed pulses in a part of memory that is retentative, i.e. a dataword or a memory flag set as retentative.

Don't use a counter, but add 1 to an integer.

 

[L D[AR2P#0.0]]

You can make timers retentive by configuring them in the cpu properties in the h/w cconfig editor.