Fail-Safe Blocks
Fail-Safe Systems
8-128 A5E00085588-03
8.14 Multiplex Blocks
Block Description
F_MUX2_R Multiplexer 1 out of 2 for REAL values
8.14.1 F_MUX2_R
Function
This block outputs one of the inputs IN0 or IN1, depending on the selection input K,
at the output OUT:
• K = 0: OUT = IN0
• K = 1: OUT = IN1
I/Os
Name Data Type Explanation Default
Inputs:
K F_BOOL Selection input 0
IN0 F_REAL Value 1 0.0
IN1 F_REAL Value 2 0.0
Output:
OUT F_REAL Output 0.0
Error Handling
In the event of an error that is critical to safety, the system function SFC F_CTRL
is called. This records the event in the Diagnostic Buffer and requests a switch to
the reserve CPU if the error occurred only on the master CPU. For non-redundant
systems or a common-cause error occurring in both CPUs, the shutdown logic can
be configured to either disable the erred F-run-time group or the entire Safety
Program.
Error Information in Diagnostic Buffer
Error Code (W#16#...) Description
75DAH
Error in the safety data format of the input K (error due to online
modification of the Safety Program or internal CPU fault)
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