VIPA IM 253 DP Series, Manual, Page: 65 / 100

Manual VIPA System 200V Chapter 3 Deployment IM 253DP
HB97E - IM - RE_253-xDPxx - Rev. 12/44 3-25
When addressing data, PROFIBUS assumes that the physical structure of
the slaves is
modular or it can be structured internally in logical functional
units, so-called modules . This model is also used in the basic DP functions
for cyclic data communication where each module has a constant number
of input-/output bytes that are transmitted in a fixed position in the user data
telegram. The addressing procedure is based on identifiers, which
characterize a module type as input, output or a combination of both. All
identifiers combined produce the configuration of the slave, which is also
checked by the DPM1 when the system starts up.
The acyclic data communication is also based on this model. All data
blocks enabled for read/write access are also regarded as assigned to the
modules and can be addressed using slot number and index.
The Slot-Number addresses the module and the index addresses the data
blocks assigned to a module. The Slot_Number = 0 addresses the data of
the PROFIBUS coupler, the Slot_Number > 0 addresses the data of the
Function modules.
AI 4x12Bit
SM 231
IM 253 DP
X 2
3 4
VIPA 253-1DP01
DO 8xDC24V
SM 222
Module 1
DO 16xDC24V
SM 222
Module 2
DI 8xDC24V
SM 221
Module 3 Module 4
0 1 2 3 4 Slot_Number
from left to right
During
data
transmission
1Byte Output
(Module 1) 2Byte Output
(Module 2)
1Byte Input
(Module 3) 4Byte Input
(Module 4)
Request:
Response:
...
...
...
...
Index
0 - 255 Index
0 - 255 Index
0 - 255 Index
0 - 255 Index
0 - 255
Each data block can be up to 244bytes. In the case of modular devices, the
slot number is assigned to the modules. Compact devices are regarded as
a unit of virtual modules. These can also be addressed whit Slot_Number
and index.
Through the length specification in the read/write request, it is also
possible to read/write parts of a data block.
Starting with the firmware version 1.3.0 your CPU has the SFB 52 res. 53
integrated for DP-V1 read res. write accesses. Here you may access the
according component of your system by declaring the ID (Slot number as
address) and index.
More detailed information is given in the description of SFB 52/53.
Addressing with
Slot and Index
Read res. write
access via SFB 52
res. 53