Siemens Simatic S7-300 CP 341 - Table 6- 5 Information in the RK 512 Message Frame Header for Send Data Request

Communication via Function Blocks
6.4 Using the Function Blocks with the RK 512 Computer Connection
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01 145
Information in the message frame header
The table below shows the information in the message frame header of the RK 512 message
frame.
Table 6- 5 Information in the RK 512 message frame header for "Send data" request
Source on your S7 automation system
(local CPU)
To the destination,
partner CPU
Message frame header, bytes
3/4 command
type
5/6 D-DBNR/D
offset
7/8 number in
Data block Data block AD DB/DW Words
Data block Expanded data
block
AD DB/DW Words
Explanation of the abbreviations used:
D-DBNR: Destination data block number
D-Offset: Destination start address
DW: Offset in words
Time sequence chart of FB P_SND_RK
The figure below illustrates the behavior of the DONE and ERROR parameters depending
on the input circuit of REQ and R.
5(4
5
'21(
(5525
6(1'UHTXHVW QRWH[HFXWHG VHQGLQJ GHDFWLYDWHG 6HQGLQJUHTXHVW &RPSOHWLRQZLWKRXWHUURU VWQWKSDUWRI6(1' 5(6(7WUDQVPLWWHG &RPSOHWLRQZLWKHUURU 5(6(7WUDQVPLWWHG &RPSOHWRQZLWKRXW
Figure 6-3 FB 8 P_SND_RK time sequence chart for "Send data" request
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