![Graco 15V331 Instructions Manual Download Page 70](http://html.mh-extra.com/html/graco/15v331/15v331_instructions-manual_2251715070.webp)
Appendix B: Profibus
™
DP Slave Communication
70
312785B
How Addressing Works
PLC addressing is in byte and uses the scheme shown
in F
IG
. 66.
The Gateway addressing follows a different scheme, as
shown in F
IG
. 67.
This means that the address number will be different
when accessing words or Dwords in the Gateway data
tags than the PLC. Table 6 shows the address relation-
ship for integer tags mapped as word in the Gateway.
F
IG
. 66. PLC Addressing Scheme
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
Byte 8
Byte 9
Word 0
Word 2
Word 4
Word 6
Word 8
Dword 0
Dword 4
Note how a Dword or word address starts at the
address of the first byte included in it.
F
IG
. 67. Gateway Addressing Scheme
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
Byte 8
Byte 9
Word 0
Word 1
Word 2
Word 3
Word 4
Dword 0
Dword 1
Here, the word or Dword addresses follow the nor-
mal numeric increment and are not directly related
to the word or bytes they are composed of.
Table 6: Addressing Relationship
Block Type
PLC
Gateway
Input (bytes)
Output (bytes)
Input (words)
Output (words)
64 words in, 64 words out
256...383
256...383
0...63
0...63
16 words in
384...415
-
64...79
-
5 words out
-
384...393
-
64...68
Summary of Contents for 15V331
Page 80: ...Dimensions 80 312785B ...