Fail-Safe Blocks
Fail-Safe Systems
A5E00085588-03
8-11
Name Data Type Explanation Default
Outputs:
PASS_OUT F_BOOL Passivation output 0
QBAD F_BOOL 1=process value invalid, value
substitution active
0
QSIM F_BOOL 1=simulation active 0
Q F_BOOL Process value 0
QN F_BOOL Negating process value 1
Q_DATA BOOL DATA component of the process
value (for visualization)
0
QUALITY BYTE Value status (quality code) of
the process value
0
ACK_REQ BOOL Acknowledgment required for
reintegration
0
Addressing
You must assign the symbol of the corresponding digital input channel to the input
VALUE of the F channel driver.
Normal Value
The digital value is output at the output Q with the quality code (QUALITY) 16#80.
Simulation Value
A simulation value can be output at the output Q instead of the normal value read
from the module.
When the input parameter SIM_ON = 1, the value of the input parameter SIM_I is
output with the quality code (QUALITY) 16#60 and the output QSIM = 1 is set.
In the event of an error, the output of the simulation value takes precedence over
the output of the substitute value.
Substitute Value
In the case of an invalid digital value as a result of a communication error
(PROFIsafe) or channel fault (e.g. wire break), in the case of passivation and
during a startup (cold or warm restart), the substitute value 0 is output with the
quality code (QUALITY) 16#48 and the output QBAD = 1 is set. If the substitute
value is not caused by passivation, the output PASS_OUT = 1 is set as well to
passivate other channels.
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