Table 6- 8 Fb 8 P_Snd_Rk Parameters For "Fetch Data" Request - Siemens Simatic S7-300 CP 341 User Manual

Assignment in the data area
The FB P_SND_RK works together with an I_SND_RK instance DB. The DB number is
passed on with the call. The instance data block is 62 bytes long. Access to the data in the
instance DB is not allowed.
FB P_SND_RK parameters
The table below lists the parameters of the FB 8 P_SND_RK for the "Fetch data" request.
Table 6- 8 FB 8 P_SND_RK parameters for "Fetch data" request
Name Sort
SF INPUT
REQ INPUT
R INPUT
LADDR INPUT
DB_NO INPUT
DBB_NO INPUT
LEN INPUT
R_CPU_NO INPUT
R_TYP INPUT
R_NO INPUT
R_OFFSET INPUT
R_CF_BYT INPUT
R_CF_BIT INPUT
DONE OUTPUT
1
ERROR OUTPUT
1
STATUS OUTPUT
1
The parameter is available until the next time the FB is called.
1
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01
www.gkbpx.com
6.4 Using the Function Blocks with the RK 512 Computer Connection
Data type Comment
CHAR Selection for Send data or Fetch
data
BOOL Initiates request on positive edge
BOOL Cancels request
INT CP 341 start address
INT Data block number of destination
INT Data block number of destination
INT Data length of the message frame
to be fetched
INT CPU number of the partner CPU
CHAR Address type on the partner CPU
INT Data block number on the partner
CPU
INT Data byte number on the partner
CPU
INT Interprocessor communication flag
byte on partner CPU
INT Interprocessor communication flag
bit on the partner CPU
BOOL Request completed without errors
BOOL Request completed with errors
WORD Specification of error
Communication via Function Blocks
Permitted values, remark
SF = 'F' (Fetch)default value: 'S' (Send)
Cancels the request in progress. Fetching is
disabled. Default: 0
The start address is taken from STEP 7.
Send DB no.: CPU-specific, zero is not
allowed
0 ≤ DBB_NO ≤ 8190 Send data starting from
data byte
1 ≤ LEN ≤ 4096, specified in number of
bytes
1
0 ≤ R_CPU_NO ≤ 4, only with multiprocessor
mode; default value: 1
'D': Data block
'X': Expanded data block
'M': Memory bit
'I': Inputs
'Q': Outputs
'C': Counters
'T': Timers
0 ≤ R_NO ≤ 255
0 ≤ CF_BYTE ≤ 255
Default value: 255 (means: without
interprocessor communication flag)
0 ≤ CF_BIT ≤ 7
STATUS parameter == 16#00;
Error information is written to the STATUS
parameter.
If ERROR == 1, the STATUS parameter will
contain error information.
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