Brcv Block-Oriented Data Reception Via An S7 Coupling - Siemens FM 458-1 DP Manual

Communication blocks

2.3.4 BRCV Block-oriented data reception via an S7 coupling

Symbol
Establish ready to receive ― BO
Addressing parameters ID ― W
Addressing parameters R_ID ― DW
Maximum length, receive data ― DI
Brief description
Mode of operation
I/O
ENR Control parameter
The block is ready to receive with ENR = 1
ID Addressing parameter
Reference to the local connection description
(this is specified as a result of the STEP7 configured connection)
RID The value at input RID specifies the association with the send SFB/FB.
The value at the input must match the R_ID parameter for SFB/FB on
the
send side. This allows several SFB/FB pairs to communicate via the
same logical coupling. The block pairs of a logical coupling, defined
using
RID or R_ID must be unique for this coupling.
RLN The maximum length of the received data is defined here.
Only values of between 0 and 65535 may be configured.
PTR The receive data, to be evaluated by the blocks for direct
communication,
is made available here (e.g. types DRD, DRD_I, etc.).
2-20
BRCV
ENR
ID
RID
RLN
The function block allows block-oriented data reception via a configured
S7 coupling.
The BRCV block receives data from a "remote" partner. The "remote"
partner is an SFB/FB, type BSEND (SFB/FB 12) on a SIMATIC S7-400
CPU.
After each data segment which has been received, an acknowledgement
is sent to the partner SFB/FB and the LEN parameter is updated.
The block is ready to receive when a "1" is connected to the control input
ENR. A running task can be interrupted with ENR=0.
The maximum length of the receive area is specified by the data at input
RLN. The length of the data block received is displayed at output LEN.
PTR DW ― Receive data is ready
NDR BO ― Status parameter NDR
LEN DI ― Length of data received before
CTR DI ― Number of receive operations
ERR BO ― Status parameter ERROR
STA W ― Status, fault display
QTS BO ― Block status
YTS W ― Status display
Function Blocks - FM 458-1 DP
Default: 0
Initialization input,
Default: 0
Initialization input,
Default: 0
Initialization input,
Default: 0
Default: 0
Edition 12.2004