AMCI ANS1 ANYNET-I/O, User Manual

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Additional Functionality
3
31
Die Protection Monitors (continued)
Constant Check
This mode uses the Check Windows associated with the input. The input must be active while the position is
within the entire check window and must be inactive for at least 500 microseconds while outside of the win-
dow. Errors that occur within a check window are reported immediately. Faults that occur outside of a check
window are recognized at the leading edge of the check window. The fault count will only increment once
between the falling edges of consecutive check windows.
Figure 3.4 shows how the Constant Check operates when the counter is set to continuously count.
Figure 3.4 Constant Check - Continuous Count Mode
a) No Fault. The input was low for at least 500 microseconds between the falling edge of previous check
window and the leading edge of this check window.
b) No Fault. The input was high during the entire check window.
c) A fault occurs because the input was not high during the entire check window.
d) The fault count increments because the input was not low for at least 500 microseconds between the fall-
ing edge of previous check window and the leading edge of this check window.
e) The fault count does not increment because the fault count will only increment once between falling edges
of consecutive check windows. The count incremented at (d).
f) The fault count does not increment because the input was low for at least 500 microseconds between the
falling edge of previous check window and the leading edge of this check window.
g) The fault count increments because the input goes low during the check window and this is the first fault
between the falling edges of consecutive check windows.
One Machine
Cycle
Die
Protection
Window
Die
Protection
Input
Fault
Output
Fault
Counter
0
a
1
c
2
d
2
f
0
b
2
e
3
g