Siemens SIMATIC S7 F Manual page 202

Fail-Safe Blocks
Outputs:
Addressing
You must assign the symbol of the corresponding digital output channel to the
output VALUE of the F channel driver.
Normal Value
The process value at the input I is made available for the associated F module
driver (F_M_DOx). 16#80 is output as the quality code (QUALITY).
Simulation Value
At the output, a simulation value can be output instead of the value at the input I
(e.g. for hardware tests).
When the input parameter SIM_ON = 1, the value of the input parameter SIM_I is
made available to the associated F module driver (F_M_DOx). 16#80 is output as
the quality code (QUALITY), and the output QSIM = 1 is set.
When SIM_MOD=0, the output of the simulation value takes precedence over the
output of the normal value and passivation, but not over the substitution value 0 in
the event of an error.
When SIM_MOD=1, the output of the simulation values always takes precedence
over the output of the normal value and passivation, regardless of any module
error. (QBAD=0) This mode would be useful to simulate "error-free operation even
without the hardware DO modules.
8-14
Name Data Type Explanation
PASS_OUT F_BOOL
QBAD F_BOOL
QSIM F_BOOL
CHADDR F_WORD
VALUE BOOL
QUALITY BYTE
ACK_REQ BOOL
Passivation output
1=process value invalid,
value substitution active
1=simulation active
Address of the channel in
the F module driver
Must be interconnected with
the symbolic address of the
channel from HWCONFIG
across the margin of the
chart
Value status (quality code) of
the output value
Acknowledgment required
for reintegration
Default
0
0
0
Interconnected
automatically
0
0
0
Fail-Safe Systems
A5E00085588-03