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9.2.1
Addressed mode
If different CPUs are to be accessed on the same MPI/PROFIBUS
via RFC1006, addressed mode is suitable.
If this mode is used, the following setting must be parameterized
on the configuration page of the Web interface.
•
‚Rack/slot mode’
must be deactivated (OFF)
Ö
Addressed Mode is active
The destination address now has to be entered in the RFC1006
driver of the Windows application (e.g. WinCC, see Section 9.3.1)
instead of the rack and slot.
Please note that the rack and slot together fill only one byte
which is divided as follows:
•
Rack fills the upper three bits
(11100000
bin
for Rack 7, Slot 0)
•
Slot fills the lower five bits
(00011111
bin
for Rack 0, Slot 31)
If you now want to communicate with destination address 2, the
following has to be entered:
Rack 0, Slot 2.
If you want to communicate with destination address 49, on the
other hand, the following has to be set:
Rack 1, Slot 17.
Section 11.5 contains a table were you can read off already con-
verted values for the rack and slot.
There are also parameterization tools that do not provide fields
with names like rack and slot. These tools normally have a
parameterization field with a name such as Remote TSAP that is
usually two bytes long and in hex format. This field, in which
only the lower byte is of interest, is parameterized as follows:
If you want to communicate with destination address 2, the fol-
lowing has to be entered:
Remote TSAP 0202
hex
.
If you want to communicate with destination address 49, on the
other hand, the following has to be set:
Remote TSAP 0231
hex
.
Section 11.5 contains a table were you can read off already con-
verted values for the Remote TSAP.
The formula
Rack * 32 + Slot = Address
can be used for simplicity.
9.2.2
Rack/slot mode
In rack/slot mode, it is possible to access specific modules of the
automation system.