3.4
I/O Modules (Optional)
3-39
[ d ] PI Latch Function
The PI latch function saves (latches) the current value to a memory register (IL
îš…îš…îš…îš…
+06)
on the
rising edge of an external signal.
Select either phase-Z or a discrete input as the external signal.
The following graph shows the number of occurrences from when PI latch signal is output to when PI
latch data is displayed.

When using a discrete input signal (DI latch), set the signal so that the signal remains ON for
5 to 60
µs.
External signal rising edge
detected point
PI latch data
0
Time (s)
PI latch completed
signal
External input signal
(either a discrete
signal or phase-Z)
PI latch detection
request signal
1 µs min.
Hardware latch
PINT PI latch data
PI latch register
display
Counter
current
value
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