Flexible Data Access: Reading/Writing Of Data Sets - Siemens SENTRON PROFINET Proxy SPP2000 Manual

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Data traffic

6.3 Acyclic data traffic

6.3.3

Flexible data access: Reading/writing of data sets

With flexible data access, the read and write accesses defined for Modbus are mapped in data

sets DS47, DS48, and DS207, and transferred via PROFINET IO.

Due to transmission of the DS47 (Read DS request) or DS207 (Read logbook request) by the

PROFINET IO controller, the SPP2000 is requested to read and provide the requested data

from the lower-level SENTRON device.

When DS48 (Write DS request) is transferred by the PROFINET IO controller, the SPP2000 is

requested to write the transferred values to the SENTRON device.

Procedure

Figure 6-1

The controller indexes the data with the Write DS47/48 or DS207 request. During this

procedure, the list of data points to be read/written is written to the SPP2000 (=indexed). The

data set may have a maximum length of 240 bytes. The addressing of the data set is

performed via the slot/subslot address of each PAC device.

All new, flexible read requests (Read DS) of other controllers are rejected with the error code

0xB5 (not indexed).

All following Read DS requests of this controller and the new indexing attempts of all other

controllers are rejected with the error code 0xC2 (Busy) until the requested data from

SPP2000 have been provided and the original controller has fetched the requested data.

The following chapters show the data structures of all data sets for read and write accesses

for the SENTRON devices.

You can find the register addresses and data formats in the manuals for the 7KM PAC

Example: Reading DS47

PROFINET Proxy SPP2000

Equipment Manual, 03/2022, L1V30814715D-01

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