Siemens S5

[chainsaw2272]

I am looking at some S5 statement list programming involving an extended flag. I can't find the difference from a flag and a extended flag. Any help or a direction to find the answer would be helpful.
Thanks Mike

 

[JesperMP]

"Flags" usually means the "Merker" bits Mx.y.

Maybe you mean the extended datablocks, DX ?
These are like normal DBs. As far as I remember it is for when the normal number of DBs supported by a CPU is not enough.

Disclaimer: It is 20+ years since I had to work with S5

 

[KalleOlsen]

If you mean S-flags, their use is restricted compared to M-flags.

As far as I can remember, the S-flags cannot be used as parameters on FB-calls (the bit length of the MC5-code does not 'fit').

I'll look for the manual ...

Kalle

 

[KalleOlsen]

Here's the CPU 948-manual.
https://cache.industry.siemens.com/dl/files/149/1087149/att_1746/v1/6ES5_998-3PR21.pdf

Search for 's flag'.

Kalle


Edit:

The CPU 928B -manual - see page 1.14.

https://cache.industry.siemens.com/dl/files/940/1085940/att_1156/v1/pa928ben.pdf

 

[chainsaw2272]

thanks so much for taking the time to help