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Appendix B: Profibus
™
DP Slave Communication
312785C 69
In the popup window, select the block type required. Two
choices are available:
• Input block: The terminology input is from the Sie-
mens perspective. Therefore this will be a block the
Gateway will write to. The tag mapped to an input
block has to be set up as Write Only.
• Output block: The terminology output is from the
Siemens perspective. Therefore this will be a block
the Gateway will read from. The tag mapped to an
output block has to be set up as Read Only.
• Select the data offset, which points the address to
read or write in the block. Select the data type to
read or write. This defines how many bytes to
access in the block to get the correct data. In this
example we choose output block, with data offset 0
(Which points to 256 in the PLC) and as a Word.
F
IG. 64.
NOTE: Since the output block is a reading block from
the Gateway standpoint, this variable should be set up
as Read Only as shown in Fig. 19. The same rule
applies if the block is an input block, it should be set up
as Write Only.
To avoid mistakes, the mapping shows with an R or W
for output or input block respectively. F
IG. 65.
F
IG. 64: Select Block Type
FIG. 65: Properties of Variable