AMCI ANS1 ANYNET-I/O, Руководство пользователя

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Additional Functionality
3
33
Die Protection Monitors (continued)
Quick Check
This mode uses the Check Windows associated with the input. The input must be active for at least 500
microseconds while the position is within the window and must be inactive while outside of the window. If
the input is never active within the Check Window, a fault will be issued, and the count incremented, at the
falling edge of the Check Window. Faults outside of the Check Window are issued, and the count increments,
as soon as the input is high. The fault count will only increment once between the falling edges of consecu-
tive check windows.
Figure 3.6 shows how the Quick Check operates when the counter is set to continuously count.
Figure 3.6 Quick Check - Continuous Count Mode
a) No Fault. The input was low between the falling edge of previous check window and the leading edge of
this check window.
b) No Fault. The input was high for at least 500 microseconds during this check window.
c) A fault occurs because the input was not high for at least 500 microseconds during this check window.
d) The fault count increments because the input goes high between check windows. The counter increments
here because the fault at (c) occurred because of the input’s state prior to the falling edge of the last check
window.
e) Fault count increments on the falling edge of the check window because the input is high.
One Machine
Cycle
Die
Protection
Window
Die
Protection
Input
Fault
Output
Fault
Counter
0
a
0
a
2
d
0
b
1
c
3
e