Siemens SIPROTEC 7SA522 Manual page 80

PROFIBUS-DP - Parameterization in DIGSI
Parameterization -
Specification of the
data access
Parameterization -
HW Config
Figure 4-11 Consistent data block with "Universal module"
80
After selecting the standard mapping for the used SIPROTEC device, it is to define
which data are to be read or written with peripheral access commands and which data
with system functions SFC14/15.
The standard mapping determines the complete possible data size at this.
Example:
Standard mapping 3-2 of the devices 7SJ61...7SJ64, 6MD63 offers a data size of 48
bytes in input direction and 9 bytes in output direction (ref. to page 3, Bus mapping
documentation of the above mentioned devices).
In input direction are transferred:
• Offset 0 to 15: single-point and double-point indications (one or two bits per value)
• Offset 16 to 35: measured values (integer values, 2 bytes)
• Offset 36 to 47: counters (unsigned long values, 4 bytes)
Possible definition in the S7 CPU program:
• write values in output direction with peripheral access commands,
• read single-point and double-point indications with peripheral access commands,
• read measured values and counters using SFC14 system function.
The parameterization of the PROFIBUS net follows next, including the configuration
of the connected SIPROTEC devices using the "Universal module" for definition of
consistent data blocks.
Please note the maximum length of 16 word values of a consistent block for a PROFI-
BUS-DP slave of the SIPROTEC device.
If more data bytes shall be read with SFC14 then two (or more) consistent blocks are
to define and the SFC is to call several times.
Continuation of the example:
Figure 4-11 shows the parameterization in HW Config using the "Universal module".
SIPROTEC PROFIBUS-DP - Communication profile
C53000-L1840-B001-03