ecostuxure machine expert basic the timer %MW retentive memory clearing

[alpikon]

Hi,

How to clear retentive timer memory %MW after stoping while timer not finished counting in ecostuxure machine expert basic?

[FernandoRodrigues]

Hi @alpikon 
I'm not sure if I got your question:
As soon you deactivate IN, the current time counting goes to zero.
Also, if you want to ensure after a power cycle that counting is not retained, you must unflag "Retentive"

[alpikon]

Hi,

At the moment I found one solution: (SB Coldstart) %Sx

That's let when counting stopped by reason and needs re-start timing over gain from 0.

[cgarden]

Hi, you can manually reset the retentive timer’s %MW memory by adding a line in your code to set it to zero when the machine stops or on a reset condition. Use %MWx := 0; where %MWx is the timer memory word. 

[JaY_V]

I would like to make a timer rentive but ist restating the timer once the power cycle has performed its not starting where the PLC goes power off, Any suggestion ?

[alpikon]

You want the timer to be "retentive", so when the PLC turns off and comes back on, the timer doesn't reset but resumes where it left off?

[JaY_V]

Exactly , but it's not happening 

[alpikon]

To make a "retentive" timer behavior (survive power cycles), you'll need to:

1. Manually retain the elapsed time (ET) in a retained variable.

2. Reconstruct the timer behaviour on start-up using this stored value.

3. A retained variable to store elapsed time.

4. A flag to indicate the timer was running when the PLC shut down.