Kasperv79
Member
Hi Guys.
I hav an general question about data traffic between CPU and CP on K-Bus backplane.
We got an issue where a vendor has an S7-300 cpu with CP connected to our SCADA via OPC (Keepware). the problem is that the 300 serie only have187kb/s on backplane which limit the use of external CP cards.
So our problem is the huge amount of strings. My question is if it does any different for the data from CPU to CP when requesting string value which is updated "LEN" value compared to full lengt. string.
E.g.
string_1[256]= "12345" where byte 1/Len is "5"
string_2[256] "12345" where byte 1/Len is "256"
Does this have any impack on the amount of data transfered from CPU to CP (backplane)
And no we dont have the option to ask the vendor to use the internal CP since its occupied by many servedrives which need the bandwith
/kasper
I hav an general question about data traffic between CPU and CP on K-Bus backplane.
We got an issue where a vendor has an S7-300 cpu with CP connected to our SCADA via OPC (Keepware). the problem is that the 300 serie only have187kb/s on backplane which limit the use of external CP cards.
So our problem is the huge amount of strings. My question is if it does any different for the data from CPU to CP when requesting string value which is updated "LEN" value compared to full lengt. string.
E.g.
string_1[256]= "12345" where byte 1/Len is "5"
string_2[256] "12345" where byte 1/Len is "256"
Does this have any impack on the amount of data transfered from CPU to CP (backplane)
And no we dont have the option to ask the vendor to use the internal CP since its occupied by many servedrives which need the bandwith
/kasper
Last edited: