Siemens SIMATIC S7 F Manual page 40

Getting Started
Restart
Shutdown
S7 F Systems V5.2 Shutdown Logic
S7 F Systems V5.2 is packaged with an enhancement that allows you to manage
shutdown and restart of the Safety Program. When an F-run-time group is created
by the user, and the project is compiled, the shutdown logic is automatically placed
by the CFC Editor. The CFC Editor creates charts to contain this logic:
@F_ShutDn and @F_DbInit1. Please note that the @ is used by the CFC editor to
denote automatically created and is a reserved name. There are other charts that
are automatically placed that are used to provide information to the shutdown logic
and these include: @F_Init1, @F_CycCo-OB35, and @F_TestMode.
At the center of the shutdown logic is the F_SHUTDN function block in the
@F_ShutDn chart. The F_SHUTDN block provides you with the following action:
•
You can force a manual shutdown of the entire Safety Program or you can
restart the shutdown Safety Program.
•
You can use the SHUTDOWN input to set either Full Shutdown or Partial
Shutdown.
•
You can use the FAILURE input of the F_SHUTDN function block to identify
that a failure occurs and observe the FULL_SD output if a failure is detected
while SHUTDOWN = Full Shutdown.
The F_SHUTDN block also has an input F_PRG_SI to provide you with the overall
Safety Program Signature, and an output SAFE_M to provide you with the current
safety mode status of the Safety Program.
The F_SHUTDN function block also reports error events to the Diagnostic Buffer.
The events reported are Restart, Full Shutdown, and Partial Shutdown. Similarly,
alarm messages are also reported to WinCC under these three conditions.
Basic Procedure
Carry out the following tasks step by step:
•
Set up the hardware (F-I/O and CPU).
•
Configure the F-system.
•
Create a fail-safe program using CFC charts.
•
Commission the F-system, and check if the fail-safe program is operational.
2-2
The shutdown logic's F_SHUTDN RESTART input allows you to
restart the Safety Program that has been shutdown.
Reintegration of I/O may be necessary after this action.
The Shutdown logic responds to an internal diagnostic that has
detected a failure by disabling either the entire Safety Program
(Full Shutdown) or the isolated F-run-time group (Partial
Shutdown). The shutdown logic response depends on how you
configured the shutdown logic, either Partial Shutdown or Full
Shutdown.
Fail-Safe Systems
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