Siemens Simatic S7-300 Specifications Page 40

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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x
3-24 A5E00105475-03
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The table below shows the GD resources of CPUs.
Table 3-15 GD resources of CPUs
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Number of GD circuits per CPU max. 4 max. 8
Number of send GD packets per GD circuit max. 1 max. 1
Number of send GD packets of all GD circuits max. 4 max. 8
Number of receive GD packets per GD circuit max. 1 max. 1
Number of receive GD packets of 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. scan rate (default) 1 (8) 1 (8)
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With the CPU configured as the DP master and 67(3V 5.1 + Service Pack 4 or
later, you can use a PG/PC to access S7 stations via various subnets (MPI
interface / PROFIBUS DP interface).
You can download user programs or a hardware configuration, or run testing and
commissioning functions, for example.
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If you use your CPU as an intelligent slave, the routing function can only be used
with an actively-configured DP interface.
In the properties of the DP interface in STEP 7, tick the Commissioning / Test
mode check box.
You will find further information in the 3URJUDPPLQJZLWK67(3PDQXDOor in the
STEP 7 Online Help.
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PtP communication enables data exchange via serial interface. PtP communication
can be used to interconnect automation devices, computers or other
communication-capable non-Siemens systems. Adaptation to the communication
partner's protocol is also possible.
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on SFCs are found in the ,QVWUXFWLRQOLVW, for details refer to the 2QOLQH+HOSIRU
67(3or to the 6\VWHPDQG6WDQGDUG)XQFWLRQV Reference Manual.
on communication are found in the Manual &RPPXQLFDWLRQZLWK6,0$7,&.
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