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, A5E02191071-01 157
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 Data type Comment Permitted values, remark
SF INPUT CHAR Selection for Send data or Fetch
data
SF = 'F' (Fetch)default value: 'S' (Send)
REQ INPUT BOOL Initiates request on positive edge
R INPUT BOOL Cancels request Cancels the request in progress. Fetching is
disabled. Default: 0
LADDR INPUT INT CP 341 start address The start address is taken from STEP 7.
DB_NO INPUT INT Data block number of destination Send DB no.: CPU-specific, zero is not
allowed
DBB_NO INPUT INT Data block number of destination 0 ≤ DBB_NO ≤ 8190 Send data starting from
data byte
LEN INPUT INT Data length of the message frame
to be fetched
1 ≤ LEN ≤ 4096, specified in number of
bytes
1
R_CPU_NO INPUT INT CPU number of the partner CPU 0 ≤ R_CPU_NO ≤ 4, only with multiprocessor
mode; default value: 1
R_TYP INPUT CHAR Address type on the partner CPU 'D': Data block
'X': Expanded data block
'M': Memory bit
'I': Inputs
'Q': Outputs
'C': Counters
'T': Timers
R_NO INPUT INT Data block number on the partner
CPU
0 ≤ R_NO ≤ 255
R_OFFSET INPUT INT Data byte number on the partner
CPU
R_CF_BYT INPUT INT Interprocessor communication flag
byte on partner CPU
0 ≤ CF_BYTE ≤ 255
Default value: 255 (means: without
interprocessor communication flag)
R_CF_BIT INPUT INT Interprocessor communication flag
bit on the partner CPU
0 ≤ CF_BIT ≤ 7
DONE
1
OUTPUT BOOL Request completed without errors STATUS parameter == 16#00;
ERROR
1
OUTPUT BOOL Request completed with errors Error information is written to the STATUS
parameter.
STATUS
1
OUTPUT WORD Specification of error If ERROR == 1, the STATUS parameter will
contain error information.
1
The parameter is available until the next time the FB is called.
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