ProSoft Technology PLX31-EIP-SIE - Manual (Page 179)

PLX3x Series SIE Protocol
Ethernet and Serial Gateways User Manual
ProSoft Technology, Inc. Page 179 of 218
September 17, 2014
PCB screen shot showing Client command to send INT data to DB1 address 0:
Row 1 in the SIMATICS Manager screen shot below shows the data transferred
from the gateway.
If the data is broken up and displayed in binary format, it can be seen that the
binary data stored in the first byte of DB1.DBW 0 is identical to that stored in byte
address DB1.DBB 0. This is because the memory locations referenced by the
first byte of DB1.DBW 0 and by DB1.DBB0 are one and the same, as explained
previously.
Same memory space
Same memory space
DB1.DBW0DB1.DBW1
2#0010_1101 2#1101_0101 2#1101_0101 2#0101_0111
DB1.DBB0 DB1.DBB1 DB1.DBB1 DB1.DBB2
The first byte of DB1.DBW0 is the same as DB1.DBB0.