Multiplex Blocks; F_Mux2_R - Siemens SIMATIC S7 F Manual

Fail-Safe Blocks
8.14

Multiplex Blocks

Block

F_MUX2_R

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
Inputs: K
IN0
IN1
Output: OUT
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#...)
75DAH
8-128
Description
Multiplexer 1 out of 2 for REAL values
Data Type Explanation
F_BOOL Selection input
F_REAL Value 1
F_REAL Value 2
F_REAL Output
Description
Error in the safety data format of the input K (error due to online
modification of the Safety Program or internal CPU fault)
Default
0
0.0
0.0
0.0
Fail-Safe Systems
A5E00085588-03