Fail-Safe Blocks
Fail-Safe Systems
A5E00085588-03
8-27
8.3.1 F_SENDBO
Function
This block safely sends 20 data items of the F_BOOL data type to another CPU.
The data can be received there by the F_RCVBO block.
The data to be sent (e.g. outputs from other blocks) is stored at the inputs
SD_BO_xx.
The data is transferred via safety frames.
If you want to temporarily switch off a data interchange that has been established
between two CPUs in order to reduce the load on the bus, you can assign the
value FALSE to the input EN_SEND. In this case, no more data is sent to the
recipient, and the recipient outputs the configured substitute values. If
communication between the connection partners was already established, when
data interchange restarted with EN_SEND = TRUE, an acknowledgment is
required on the recipient’s side before the values sent are output again.
Startup Characteristics
After a startup (cold restart or warm restart), communication must first be
established between the communication partners. F_SENDBO indicates this at the
SUBS_ON parameter with "1". The recipient (F_RCVBO) outputs substitute values
during this time until communication between F_SENDBO and F_RCVBO has
started up via the safety frame and any acknowledgment required for reintegration
at F_RCVBO has been made.
I/Os
Name
Data Type
Explanation
Default
Inputs:
EN_SEND
BOOL
1 = switch transmission on
0 = switch transmission off
1
ID
WORD
ID addressing parameter
0000
R_ID
DWORD
R_ID addressing parameter
00000000
SD_BO_00
F_BOOL
Send date 00
0
...
...
SD_BO_19
F_BOOL
Send date 19
0
CRC_IMP
DWORD
Address reference CRC
Supplied
automatically
TIMEOUT
F_TIME
Monitoring time in ms for vital-
sign monitoring
T#0 ms
Outputs:
ERROR
F_BOOL
Transmission error
0
SUBS_ON
F_BOOL
Recipient outputs substitute
values
0
RETVAL
WORD
Error code
0000
Summary of Contents for SIMATIC S7 F
Page 8: ...Important Information Fail Safe Systems viii A5E00085588 03 ...
Page 16: ...Contents Fail Safe Systems xvi A5E00085588 03 ...
Page 38: ...Product Overview Fail Safe Systems 1 22 A5E00085588 03 ...
Page 56: ...Getting Started Fail Safe Systems 2 18 A5E00085588 03 ...
Page 70: ...Safety Mechanisms Fail Safe Systems 3 14 A5E00085588 03 ...
Page 115: ...Programming Fail Safe Systems A5E00085588 03 5 33 Examples Receive Block Send Block ...
Page 154: ...Programming Fail Safe Systems 5 72 A5E00085588 03 ...
Page 166: ...Operation and Maintenance Fail Safe Systems 6 6 A5E00085588 03 ...
Page 332: ...Fail Safe Blocks Fail Safe Systems 8 144 A5E00085588 03 ...
Page 344: ...References Fail Safe Systems B 2 A5E00085558 03 ...
Page 350: ...Glossary Fail Safe Systems Glossary 6 A5E00085588 03 ...