Communication via Function Blocks
6.3 Using the Function Blocks
Point-to-point connection CP 440 Installation and Parameter Assignment
92 Manual, 09/2007, A5E00057742-03
Assignment in the Data Area
The SEND_440 FB works with an instance DB (I_SEND_440). The DB number is specified in
the call. The data in the instance DB cannot be accessed.
Note
Exception: If the error STATUS == W#16#1E0F occurs, you can consult the SFCERR
variable for more details of the error. This error variable can only be loaded via a symbolic
access to the instance DB.
Parameters of the SEND_440 FB
The following table lists the parameters of the SEND_440 FB.
Table 6-3 Parameters of the SEND_440 FB
Name Type Data type Description Permitted Values
Comment
REQ INPUT BOOL Initiates request with
positive edge
R INPUT BOOL Aborts request Current request is aborted.
Sending is blocked.
LADDR INPUT INT Basic address of CP 440 The basic address is taken from
STEP 7.
DB_NO INPUT INT Data block number Send DB No.: CPU-specific,
zero is not allowed
DBB_NO INPUT INT Data byte number 0 ≤ DBB_NO ≤ 8190 Transmitted
data as of data word;
Offset is CPU-specific
LEN INPUT INT Data length 1 ≤ LEN ≤ 400 (Page 86),
specified in number of bytes
DONE
1
OUTPUT BOOL Request completed without
errors
Parameters
STATUS == 16#00;
ERROR
1
OUTPUT BOOL Request completed with
errors
STATUS parameter contains error
details
STATUS
1
OUTPUT WORD Error specification If ERROR == 1, STATUS
parameter contains error details
1
The parameter is available until the next call of the FB!
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