Communication via Function Blocks
6.3 Using the Function Blocks
Point-to-point connection CP 440 Installation and Parameter Assignment
96 Manual, 09/2007, A5E00057742-03
Assignment in the Data Area
The RECV_440 FB works with an instance DB (I_RECV_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#1E0E) 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 RECV_440 FB
The following table lists the parameters of the RECV_440 FB.
Table 6-5 Parameters of the RECV_440 FB
Name Type Data type Description Permitted Values, Comment
EN_R INPUT BOOL Enables data read
R INPUT BOOL Aborts request Current request is aborted. Receiving is
blocked.
LADDR INPUT INT Basic address of CP 440 The basic address can be found in the
configuration table in STEP 7.
DB_NO INPUT INT Data block number Receive DB No.:
CPU-specific, zero is not allowed
DBB_NO INPUT INT Data byte number Offset is CPU-specific
NDR
1
OUTPUT BOOL Request completed without
errors, data accepted
STATUS parameter == 16#00;
ERROR
1
OUTPUT BOOL Request completed with
errors
STATUS parameter contains error details
LEN
1
OUTPUT INT Length of message frame
received
1 ≤ LEN ≤ 400 (Page 86),
specified in number of bytes
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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