Nodes On The Subnet - Siemens CPU 313C Hardware And Installation Manual

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These subnets are the most frequently used for S7-300 CPUs, so they are
discussed in detail below.
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In the following, all networked devices are referred to as nodes.
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A segment is a bus link between two terminating resistors. A segment can include
up to 32 nodes. It is also limited by the permitted line length, depending on the
transmission rate.
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These maximum transmission rates are possible:
• MPI
CPU 317-2 DP: 12 Mbps
–
All other CPUs: 187.5 Kbps
–
• PROFIBUS DP: 12 Mbps
• PtP:
Half duplex: 38.4 Kbps
–
Full duplex: 19.2 Kbps
–
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Maximum possible number of nodes per subnet:
Table 5-13
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Number
Addresses
Remarks
1)
Note the CPU-specific maximum specifications in the CPU manual.
5-32
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Nodes on the subnet

03,
127
0 to 126
Default: 32 addresses
Reserved are:
•
address 0 for PG
•
address 1 for OP
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
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1)
126
0 to 125
of those:
1 Master (reserved)
1 PG connection (address 0
reserved)
124 slaves or other masters
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