Siemens Step 7 Unknown Call in STL

[woolie161]

Hi Siemens Experts,
I am hoping someone can shed some light on my issue.
I have uploaded the code from a S7-300 (317-2PN/DP) using Step 7 V5.6, as I believe this was the version used originally. The system is operating and there are no errors on the CPU. I am looking to migrate to TIA V18, but when I compile the Uploaded code in Step 7, it reports errors. On error I am having difficulty with is shown below.

Can anybody suggest how I determine what the "CALL" instruction is supposed to calling (i.e. FBxx, FCxx etc.)

Thank you.
Woolie

 

[hill831017]

FB199 declare any in/output/Static?
Or you could declare in current block for the L6.x/LD7, then try to switch to LAD(Ctrl+1）

 

[woolie161]

Thanks for the reply Hill831017,
I will try your suggestions.
The uploaded code has multiple "Call" instruction across multiple FB's so hopefully it is an easy fix.
Thanks again
Woolie161

 

[Lare]

You should have original offline project of Step7.
Converting uploaded code to TIA portal and you own problems of code which isn't easily understable without any comments and symbols.

 

[woolie161]

Thanks Lare,
Our client is about the 4th or 5th owners of this equipment and it has had many modifications along the way. I have looked for the original "offline" code several times with no success. Looks like I have created a lot more work for myself.
Thanks for taking the time to respond.
Woolie

 

[L D[AR2P#0.0]]

Is there an FB199 in the online folder?

 

[woolie161]

Hi LD[AR2,P#0.0]
Yes there is an FB199 in the online folder, and it is called from other FB's and some of those compile. From the above STL, it is the "Call" / End Call" instruction that has me confused. I thought a "CALL" needed an FBxx associated with it. Where as the sample STL, the call instruction, doesn't call anything. The BLD instruction is from the Ladder to STL conversion, I think, so I don't understand what the "CALL" is doing. I don't think the "UC FB199" is the issue. But then I am more often wrong than right.
Thanks for replying
Woolie

 

[L D[AR2P#0.0]]

The call is a nicely presented version provided by the editor. There are no 'call' instructions in S7-300, just code to manipulate the parameters followed by a UC FB199.
The red 'call End call' is normally the symptom of a block that is being called but is not present in the offline folder (hence the editor cannot give you a nicely presented version of the call).

 

[I_Automation]

I'm not as experienced on Siemens as others, but maybe: [My W.A.G]



When you uploaded there could be a restricted block that the original offline code is needed to have, and since your upload didn't include that/those block(s) the call is to a non-existent block in your upload file, so it's calling nothing.

 

[woolie161]

Thanks to both LD & I_Automation,
It's looking like a lot of my issues stem from an uploaded version of the PLC code.
A lot of the blocks are created from SCL code and some of the existing FB & FC's are missing the SCL code. Also when compiling, there are some "know How" protect blocks that cannot be compiled.
Again, thank you both for taking to time to reply.