F_Rcvr - Siemens SIMATIC S7 F Manual

Fail-Safe Blocks
8.3.4

F_RCVR

Function
This block safely receives 20 data items of the F_REAL data type sent by the
F_SENDR block from another CPU.
The received data comes to the outputs RD_R_xx for further processing by other
blocks.
The data is transferred via safety frames.
Startup Characteristics
After a startup (cold restart or warm restart), communication must first be
established between the communication partners. As long as the recipient does not
receive a safety frame from the sender, it sets the output SUBS_ON and outputs
the substitute values at the outputs RD_R_xx.
The substitute values can be applied at the inputs SUBR_xx.
I/Os
Name
Inputs: ID
R_ID
CRC_IMP
TIMEOUT
ACK_REI
SUBR_00
...
SUBR_19
Outputs: ACK_REQ
ERROR
SUBS_ON
RD_R_00
...
RD_R_19
RETVAL
Fail-Safe Systems
A5E00085588-03
Data Type Explanation
WORD ID addressing parameter
DWORD R_ID addressing parameter
DWORD Address reference CRC
F_TIME Monitoring time in ms for vital-
sign monitoring
F_BOOL Acknowledgment for
reintegration of process values
after transmission errors
F_REAL Substitute value for receipt
data 00
...
F_REAL Substitute value for receipt
data 19
BOOL Acknowledgment for
reintegration of process values
required
F_BOOL Transmission error
F_BOOL Substitution values are output 1
F_REAL Receipt data 00
...
F_REAL Receipt data 19
WORD Error code
Default
0000
00000000
Supplied
automatically
T#0 ms
0
0
0
0
0
0
0
0000
8-33