SIE Protocol PLX3x Series
User Manual Ethernet and Serial Gateways
Page 178 of 218 ProSoft Technology, Inc.
May 26, 2016
If DB1.DBD0 is used as the first address in the Siemens processor, the next
double word address that can be used without overwriting the data would be
DB1.DBD4.
All of the above share the same memory locations in the processor.
Note: Incorrect memory location addressing can cause the data to be overwritten.
Below is a graphical representation of the addressing of the processor’s memory
locations.
DB1.DBD1
DB1.DBW0 DB1.DBW1 DB1.DBW2 DB1.DBW3
2#0000_0110 2#0000_0000 2#0110_0001 2#0011_0110 2#1100_0110
DB1.DBB0DB1.DBB1 DB1.DBB2 DB1.DBB3 DB1.DBB4
DB1.DBD0
Example:
Sending an integer value of 11733 from gateway register 1000 to a Siemens S7-
300 processor demonstrates the addressing scheme in the Siemens S7-300
processor:
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