Setting up an S7-300 with a Technology CPU
4.4 Subnets
Transmission rate
Maximum transmission rates:
• MPI/PROFIBUS DP: 12 Mbaud
We recommend that you set 12 Mbaud for the Technology CPU
• DP(DRIVE): 12 Mbaud
Note
Before you transfer projects to the Technology CPU via the MPI/DP interface, you should
increase the baud rate to at least 1.5 Mbaud or else the data transmission can take a very
long time (up to 15 minutes at 187.5 kbaud).
Number of nodes
Maximum number of nodes per subnet:
Table 4-2 Subnet nodes
Parameters MPI PROFIBUS DP PROFIBUS DP (DRIVE)
Number 127 126 33
Addresses 0 to 126 0 to 125 1 to 125
Comments Default: 32 addresses
Reserved addresses:
• Address 0 for PG
• Address 1 for OP
of which:
1 master (reserved)
1 PG connection
(address 0 reserved)
124 slaves or other
masters
of which:
• 1 master (reserved) and
32 slaves or drives
S7-300 CPU Data: CPU 315T-2 DP
Manual, 12/2005, A5E00427933-02
4-3
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