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
144 Manual, 09/2008, A5E02191071-01
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 "Send data" request.
Table 6- 4 FB 8 P_SND_RK parameters for "Send data" request
Name Sort Data type Comment Permitted values, remark
SF INPUT CHAR Selection for Send data or Fetch
data
SF = 'S' (Send)
Default: 'S'
REQ INPUT BOOL Initiates request on positive edge
R INPUT BOOL Cancels request Cancels the request in progress.
Transmission 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 source Send DB no.: CPU-specific, zero is not
allowed
DBB_NO INPUT INT Data byte number of source 0 ≤ DBB_NO ≤ 8190 Send data
starting from data byte
LEN INPUT INT Data length of the message frame
to be sent
1 ≤ LEN ≤ 4096, specified in number
of bytes; only even-numbered values
are appropriate
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
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
0 ≤ R_OFFSET ≤ 510, even-numbered
values only
R_CF_BYT INPUT INT Interprocessor communication flag
byte on partner CPU
0 ≤ R_CF_BYTE ≤ 255
Default: 255 (means: without
interprocessor communication flag)
R_CF_BIT INPUT INT Interprocessor communication flag
bit on the partner CPU
0 ≤ R_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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