difficulty in creating a task that runs inn a spesific time of day

ioannisg · Apr 2, 2011

HI to all you programmers

i am new to this type of programming with obs etc .Does any one has a clear example that shows exactly how is it possible to crate something in a ob1 or another ob witch is programmed to run in a specific time of day such as turning on the house lights in 8:00 .It is importat if it is way to run this in s7plc sim mode cause when i try an ob 10 it doesnt run at all..please if anyone can illuminate me it would be very helpfull

Michael Hunt · Apr 2, 2011

ioannisg said:
HI to all you programmers

i am new to this type of programming with obs etc .Does any one has a clear example that shows exactly how is it possible to crate something in a ob1 or another ob witch is programmed to run in a specific time of day such as turning on the house lights in 8:00 .It is importat if it is way to run this in s7plc sim mode cause when i try an ob 10 it doesnt run at all..please if anyone can illuminate me it would be very helpfull

Hi

You can use SFC 1 to read the system clock. SFC1 returns DATE_AND_TIME. It's 8 byte variable and all bytes are in BCD.

Refer to:

http://www.plctalk.net/qanda/showthread.php?t=60190&highlight=sfc1

http://support.automation.siemens.c...lib.csinfo&lang=en&objid=21222026&caller=view

ioannisg · Apr 2, 2011

Mikey dow you know if i can use sfc1 inside me initial ob1 or i must call it as a function;

Michael Hunt · Apr 2, 2011

ioannisg said:
Mikey dow you know if i can use sfc1 inside me initial ob1 or i must call it as a function;

I would create a specific function.

What is it you are trying to do exactly?

ioannisg · Apr 2, 2011

i am trying to make a programme that turn on the lights of a house everyday in 9:00 am!!i am not sure what is the best way to do this an if i myst use an OB1 or OB10

Michael Hunt · Apr 2, 2011

What PLC are you trying to use? Is its only function to turn on the lights?

ioannisg · Apr 2, 2011

Is for s7 300. Basically i want to test it first in s7plcsim as i dont have in front me the actual plc.generally i am trying to write a programm that control lighting(switching on or off for different times of day).

L D[AR2P#0.0] · Apr 2, 2011

What are you doing to verify that OB10 does not run?

I've tested the time of day interrupt using PLCSIM and it does work.

Jack Schit · Apr 2, 2011

I have recently worked on a project for the first time which required a flag in the PLC to be set at a set time. The PLC was connected to a WinCC Flex HMI so I used the WinCC Flex scheduler function to set the flag.

In this situation, what would be considered best practise, to use OB10 or the WinCC Flex scheduler function?

ioannisg · Apr 4, 2011

yes i activated the OB10 in HW confing but then what i must dO exactly in the plc sime menu;

L D[AR2P#0.0] · Apr 4, 2011

Post your project as an attachment.

ioannisg · Apr 4, 2011

Look what i did .. Tell what is wrong to fix it
a)firtt i used the sfcs (read clc) then sfc 28 then scf 30 to activate my interupt .all of them i used them in a single ob1.in a sfc 28 i set an ob 10 to happen for every minute starting from the time used in sfc 1.in ob10 i wrote a single line to test it (per example turning on light).then i go to s7plcsim but i doesnt run.look my photos

L D[AR2P#0.0] · Apr 4, 2011

See post #11

ioannisg · Apr 4, 2011

Did you see my attachment;

ioannisg · Apr 4, 2011

I also tried to use sfc1 and fc 8 in a fc that i created but as sfc1 seems to work (q0.0 actules turns active) the fc8 doesnt work(q0.1 is still inactive in eno)

difficulty in creating a task that runs inn a spesific time of day

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