Nodes On The Subnet - Siemens S7-300 Installation Manual

&RQILJXULQJ
 %DVLF SULQFLSOHV RI 03, DQG '3 VXEQHWV
03,352),%86 '3
These subnets are the most frequently used for S7-300 CPUs, so they are
discussed in detail below.
&RQYHQWLRQ 'HYLFH
In the following, all networked devices are referred to as nodes.
6HJPHQW
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.
7UDQVPLVVLRQ UDWH
These maximum transmission rates are possible:
• MPI
12 Mbps with CPU 318-2 DP
–
187.5 Kbps with all other CPUs
–
• PROFIBUS DP: 12 Mbps
1XPEHU RI QRGHV
Maximum possible number of nodes per subnet:
Table 5-13
3DUDPHWHUV
Number
Addresses
Remarks
1) Note the CPU-specific maximum specifications in the CPU manual.
5-34
1RGH

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 312IFM - 318-2 DP
352),%86 '3
1)
126
0 to 125
of those:
1 Master (reserved)
1 PG connection (address 0 reserved)
125 slaves or other masters
A5E00203919-01