315-2DP as a Master, EM 277 as a Slave

[hagos]

Dear folks,

I'm still in the phase of data assignment for the data exchange between a 315-2DP as a master & several EM 277 as slaves.

I'm choosing 8 byte out/8 byte in, one of my slaves is having the I/Q range of 256-263, I wrote the SFC 14 as follows:

CALL SFC 14
LADDR :=W#16#100 //Staring address 256
RET_VAL :=MW12
RECORD :=P#DB8.DBX0.0 BYTE 8

My question is:Would this work although that LADDR is looking for an address > 128 in the I/Q ?

N.B
===
I'm using >128 for the data exchange because I want to dedicate the 0-127 bytes for my physical inputs/outputs

Best regrads
Hagos

 

[JesperMP]

My question is:Would this work although that LADDR is looking for an address > 128 in the I/Q ?

That is the whole point of SFC14/SFC15. To be able to read/write i/o data consistently when it is outside the proces image of the CPU.
If the i/o is inside the proces image, then you can forget about SFC14/SFC15.