Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 38)

Communication
3.2 Communication services
CPU 31xC and CPU 31x, Technical data
3-10
Manual, Edition 08/2004, A5E00105475-05
GD resources of the CPUs
Table 3-4 GD resources of the CPUs
Parameters CPU 31xC, 312, 314 CPU 315-2 DP,
315-2 PN/DP, 317
Number of GD circuits per CPU Max. 4 Max. 8
GD packets transmitted per GD circuit Max. 1 Max. 1
GD packets transmitted by all GD circuits Max. 4 Max. 8
GD packets received per GD circuit Max. 1 Max. 1
GD packets received by all GD circuits Max. 4 Max. 8
Data length per GD packet max. 22 bytes max. 22 bytes
Consistency max. 22 bytes max. 22 bytes
Min. reduction ratio (default) 1 (8) 1 (8)
3.2.7 Routing
Properties
STEP 7 V5.1 + SP4 or higher allows you to access your S7 stations on all subnets with your
PG/PC, for example, to
•
download user programs
• download a hardware configuration, or
• perform debugging and diagnostic functions.
Note
When the CPU is used as intelligent slave, the routing function is only available when the
DP interface is set active. IN STEP 7, set the Test, Commission Routing check box on
the properties dialog of the DP interface. For detailed information, refer to the
Programming with STEP 7 manual, or directly to the STEP 7 Online Help