F_Start - Siemens SIMATIC S7 F Manual

Fail-Safe Blocks
8.5.5

F_START

Function
In the first cycle of the cyclic interrupt cycle after a cold or warm restart, the block
indicates by means of a value of 1 at the output COLDSTRT that a startup (cold or
warm restart) has been carried out. COLDSTRT remains present until the next call
of F_START.
The F_START must be called before the evaluating blocks.
I/Os
Name
Output: COLDSTRT
Error Handling
None
8-54
Data Type Explanation
F_BOOL Startup identifier (cold restart
or warm restart)
Default
1
Fail-Safe Systems
A5E00085588-03