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Safety Device Function Blocks Section 3-5
Timing Chart
3-5-8 User Mode Switch
Basic Function The User Mode Switch function block is used to monitor an operating mode
switch in the user system or device.
Diagram
General Description The User Mode Switch function block is used to monitor an operating mode
switch in the user system or device.
The operating mode switch that can be connected with this function block
must be a 1-of-N type switch (i.e., one of N contacts is ON). The function
block supports a maximum of eight inputs and corresponding outputs.
The output corresponding to the input that is active is turned ON. If an error is
detected for the function block, however, all outputs will turn OFF.
Startup All errors are turned OFF and all timers are reset at the start of operation.
Outputs are turned ON or OFF according to the input status.
Optional Output
Settings
The number of I/O can be increased on the In/Out Setting Tab Page in the
function block property dialog box.
The number of inputs and the number of outputs will be the same.
IDLE to RUN
500 ms 500 ms
500 ms
Discrepancy
Time
Input1
(Pair1-NO)
Output
Enable
Discrepancy
Error Pair1
Input2
(Pair1-NC)
Input3
(Pair2-NO)
Fault
Present
Input4
(Pair2-NC)
Discrepancy
Error Pair2
Default Maximum Number of I/O
Parameter Setting range Default
setting
Number of
inputs
2 to 8 2
Number of
outputs
2 to 8 2