SIE Protocol
PLX3x Series ♦ Multi-Protocol Gateways
User Manual
Page 168 of 215
ProSoft Technology, Inc.
January 25, 2018
If DB1-DBW0 is used as the first address in the Siemens processor, the next
word address that can be used without overwriting the data is DB1.DBW2.
The gray area above represents the byte memory locations being overlapped
when the double word address is used consecutively (DB1.DBD0, DB1.DBD1,
DB1.DBD2, etc.).
If DBD1.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.
The following image represents the addressing of the processor's memory.
