S7- Date Extraction not working

Hello All,
I am facing a wierd problem on S7-400 PLC.
I am trying to extract date using following simple logic & using PLCSIM to test it.
SFC1 reads the Date & time to a #cdt1 temp DT type. This temp #CDT is sent as input to FC^ DT_DATE function & the ouput I receive is 0 (DEC) or 1990-1-1, I checked up the clock setting & it is showing properly the PC current date & time.
The FC8 function works fine & shows the current time.
Is this PLCSIM problem or am I making mistake somewhere?

Any suggestions????
Thanks,

Hello PLC_Talk;
Here is an extract from the following Siemens' support named :
"Difference between PLCSIM V5.0 and a "real" automation system"

http://support.automation.siemens.com/WW/llisapi.dll?csquery0=sfc1&aktprim=0&extranet=standard&func=cslib.csinfo&lang=en&nodeid0=10805405&objaction=csbrowse&objid=10805405&siteid=cseus&subtype=133000



Please note that the following SFBs and SFCs are NOPs (no-operations):

• SFB12, SFB13, SFB14, SFB15, SFB16, SFB19, SFB20, SFB21, SFB22 and SFB23,
• SFC7, SFC11, SFC25, SFC35, SFC36, SFC37, SFC38, SFC48, SFC60, SFC61, SFC62, SFC65, SFC66, SFC67, SFC68, SFC69 and SFC81
• OB81, OB84, OB87 and OB90

So, SFC1 will not produce the processor time (it was never designed to read the PC clock anyway...).

Hope this helps,
Daniel Chartier

SFC1 is not in the list of nops and does work in plcsim (V5.2) with a 317 as the CPU. What exactly is this "FC^ DT_DATE" ?

Sorry about that, guys.

I stand corrected.
Daniel Chartier

L D[AR2 said:

What exactly is this "FC^ DT_DATE" ?

Click to expand...

He might have been holding the SHIFT key in.....

Here's a link for an example of how to extract the date information:-

http://www.plctalk.net/qanda/showpost.php?p=191480&postcount=3

Hello Guys,
Thanks for the information.
The weird thing is the same programmed worked next day! May be it just needed a PC reboot.
a. BTW FC^ is a typo, it's FC6

Thanks,