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
158 Manual, 09/2008, A5E02191071-01
Parameters in the FB for data source (Partner CPU)
The following table lists the data types that can be transmitted.
Table 6- 9 Transmittable data types for "Fetch data" request
Source on the partner
CPU
R_TYP R_NO R_OFFSET (in bytes)
(This value is specified by the partner CPU.)
Data block 'D' 0 - 255 0 - 510
(only even-numbered values are appropriate!)
Expanded data block 'X' 0 - 255 0 - 510
(only even-numbered values are appropriate!)
Bit memory 'M' irrelevant 0 - 255
Inputs 'I' irrelevant 0 - 255
Outputs 'Q' irrelevant 0 - 255
Counters 'C' irrelevant 0 - 255
Timers 'T' irrelevant 0 - 255
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- 10 Information in the RK 512 message frame header for "Fetch data" request
Source on the partner CPU To the destination, your S7
automation system (local
CPU)
Message frame header, bytes
3/4 command type 5/6 S-DBNR/S-
offset
7/8 number in
Data block Data block ED DB/DW Words
Expanded data block Data block EX DB/DW Words
Bit memory Data block EM Byte address Bytes
Inputs Data block EE Byte address Bytes
Outputs Data block EA Byte address Bytes
Counters Data block EC Counter no. Words
Timers Data block ET Timer number Words
Explanation of the abbreviations used:
S-DBNR: Source data block number
S-Offset: Source start address
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