Siemens Simatic S7-300 Specifications download pdf (Page 168)

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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x

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The user program can only be downloaded and thus the CPU can only be used if

the MMC is inserted.

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With CPUs 315-2 DP (6ES7315-2AFx3-0AB0), 316-2DP and 318-2 DP, PG/OP

functions at the DP interface were only possible if the interface was set to active.

With CPUs 31xC/31x, these functions are possible at both active and passive

interfaces. The performance of the passive interface is considerably lower,

however.

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If you use the CPU 31xC/31x 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.

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For data blocks for CPU 317-2 DP

• you can set the retentive response in the block properties of the DB (as of

STEP 7, V5.2 + SP 1).

• using SFC 82 “CREA_DBL“ -> Parameter ATTRIB, Bit NON_RETAIN, you can

specify if the actual values of an OB should be maintained at POWER OFF/ON

or STOP-RUN (retentive DB) or if the start values should be read from the load

memory (non-retentive DB):

1 2 ... 163 164 165 166 167 168 169 170 171 172 173 ... 189 190

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Siemens Simatic S7-300 Specifications Page 168