Siemens S7-300 appendix Load memory concept for the CPU 31xC/31x, 10 PG/OP functions

Appendix

A.1 Information about upgrading to a CPU 31xC or CPU 31x

A.1.9 Load memory concept for the CPU 31xC/31x

Load memory concept for the CPU 31xC/31x

On CPUs 312 IFM to 318-2 DP, the load memory is integrated into the CPU and may be extended with a memory card,

The load memory of the CPU 31xC/31x is located on the micro memory card (MMC), and is retentive. When blocks are downloaded to the CPU, they are stored on the MMC and cannot be lost even in the event of a power failure or memory reset.

Reference

See also the Memory concept chapter in the CPU Data 31xC and 31x manual.

Note

User programs can only be downloaded and thus the CPU can only be used if the MMC is inserted.

A.1.10 PG/OP functions

PG/OP functions

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.

A.1.11 Routing for the CPU 31xC/31x as an intelligent slave

Routing for the CPU 31xC/31x as an intelligent slave

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, select the "Test, Commissioning, Routing" check box of the "DP-Slave" option.

A-8	CPU 31xC and CPU 31x, Technical data
	Manual, Edition 08/2004, A5E00105475-05