Hello everyone,

I want to use step7 to save an analog value in specific time.so just I want to read the real time and compare this time with the specific one for example 09:00h, if are equal I use the move instruction to move the analog value to a new memory.

Any help??

Best regards

dchartier

Hello new-tech;

The straightforward way to do this is to use SFC1 "Read_CLK" to read the system time on your PLC:

How can you read out the date and time with SFC1 (READ_CLK) and set them with SFC0 (SET_CLK)?

You can then use the compare instructions for Date_and_Time (DT) variables available in the IEC library of Step 7 :

Which functions are available in STEP 7 V5.5 and in TIA Portal for processing the data types DT and DTL?

You will have to learn how to use DT variables in your program to setup your setpoints, look this item up in the Online Help files of Step 7.

Hope this helps,

Daniel Chartier

 OK I'll try thank you so much

hi,

be careful with comparing times. If you compare the systemtime to equal you need to have the same time down to the milliseconds. If one OB1-cycle is longer than 1ms it is hard to get it equal in OB1.

You can work with interrupt-OB´s to get it done.

In which intervalls do you want to save the data?

regards,

mopS04

hi,

be careful with comparing times. If you compare the systemtime to equal you need to have the same time down to the milliseconds. If one OB1-cycle is longer than 1ms it is hard to get it equal in OB1.

You can work with interrupt-OB´s to get it done.

In which intervalls do you want to save the data?

regards,

 I want to take an analogue value each 6:00h and just want to move this value to another address in this time. Is there possibility to get this object by using some instructions but outside of Ob1?

Thank you