F_Shutdn - Siemens SIMATIC S7 F Manual

Fail-Safe Blocks
8.6.9

F_SHUTDN

Function
The F_SHUTDN function block, which is a standard function block packaged in the
Failsafe Blocks library, provides new functionality to control and manage F-run-time
group shutdown and reinitialization.
The F_SHUTDN function block:
•
is automatically placed by the compiler in a CFC named @F_ShutDn.
•
interfaces to other blocks within the Safety Program.
•
has two separate interfaces: shutdown logic interface and restart logic
interface.
•
is connected to the shutdown logic through the RTG_LOGIC blocks to the
F_PLK, F_PLK_O, F_TEST, F_TESTC, and F_CYC_CO.
•
is connected to the restart logic through the RTG_LOGIC connected to the
DB_INIT functionsstored in the @F_DbInit1.
•
is placed in the slowest Organizational Block (OB3x) in a run-time group
named @F_ShutDn.
Note
No other logic shall be permitted to be placed within the @F_ShutDn CFC.
Connections may only be made to specified inputs and outputs of the F_SHUTDN
function block (see the table of I/Os below). Any logic placed within the
@F_ShutDn CFC will automatically be deleted during the compile.
I/Os
Name
Inputs: RESTART
FAILURE
8-72
Data Type Explanation
BOOL Used to restart any F Run-time
group that is shutdown. A
rising edge will trigger the
reinitialization process that
may take several seconds to
complete. This input may be
connected to external logic.
BOOL Combination of logical OR of
all F Run-time group
Shutdown requests (FAILED
output of F_PLK, F_TEST,
F_TESTC, and F_CYC_CO).
This input cannot be
connected to external logic.
Default
0
0
Fail-Safe Systems
A5E00085588-03