Siemens SINUMERIK 840D sl Function Manual page 1285

I/O expansion
I/O modules, central
PROFIBUS DP interfaces
Interfaces (MPI)
Note
Number of PROFIBUS slaves
The content of the SDB2000 and related further SDBs is stored by the PLC operating system
in internal data structures, which the Profibus ASIC can also access. Furthermore,
information from SDB 2000 is also conditioned (CPI interface) and transmitted to the NCK
and the PLC basic program. This is necessary for controlling drives and PROFIsafe modules
on Profibus. A memory area defined by the PLC is available for these data structures. Its
size is limited by the maximum number of slots. This means that during loading, SDBs with
fewer slaves than listed above may be refused. A slot is usually a slave module or the slave
itself. Only on a module with both I and Q areas does one module count as 2 slots. It is,
therefore, not possible to specify the size of SDB 2000 exactly. It cannot be determined
whether the configuration is legal until the SDB container has been loaded to the CPU. The
values shown above must be taken as guide values only. If the configuration is not
permissible, the alarm 410160 is set. If the configuration does not fit in the internal data
range, no PROFIsafe and no SFC 15 functions work.
PLC versions
PLC 317-2DP with SIMATIC version 2.1.8 (version ID 20.70.31) or higher version is
implemented These versions are compatible with the corresponding SIMATIC CPU 300,
which means that all modules and software packages that are approved for these versions
and CPUs on SIMATIC are, therefore, suitable. Exceptions are modules, which in general
may only be put in line 0.
Version identification in the version screen is made up of:
• SIMATIC CPU PLC primary version identifier
• Firmware transfer increment
• Internal increment
Example ID
317-2DP PLC with MLFB 6FC5 317-2AJ10-0AB0: 20.70.31
Basic logic functions: PLC basic program solution line (P3 sl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
2.1 Key PLC CPU data for 810D, 840D and 840Di
PROFIBUS only
1 (2)
1 (0)
Detailed description
PROFIBUS only
1 (2)
1 (0)
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