Siemens Simatic S7-400 - Page 81

Assignment in the Data Area
The RECV_440 FB works with an instance DB (I_RECV_440). The DB number is speci󹪝ed 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
additional details (see the chapter "Diagnostics Messages of the Function Blocks (Page 97)").
. 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 6-3 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 con󹪝gu‐
ration table in STEP 7.
DB_NO INPUT INT Data block number Receive DB No.:
CPU-speci󹪝c, zero is not allowed
DBB_NO INPUT INT Data byte number O󹪜set is CPU-speci󹪝c
NDR
1
OUTPUT BOOL Request completed without
errors, data accepted
STATUS parameter == 16#00;
ERROR
1
OUTPUT BOOL Request completed with er‐
rors
STATUS parameter contains error details
LEN
1
OUTPUT INT Length of message frame re‐
ceived
1 ≤ LEN ≤ 400 (see chapter "Overview of the
Function Blocks (Page 73)"),
speci󹪝ed in number of bytes
STATUS
1
OUTPUT WORD Error speci󹪝cation If ERROR == 1, STATUS parameter contains error
details
1
The parameter is available until the next call of the FB!
Communication via Function Blocks
6.3 Using the Function Blocks
Point-to-point connection CP 440 Installation and Parameter Assignment
Equipment Manual, 03/2022, A5E00057742-AE 81