Latched Strobe Input Function
Any of the four hardware inputs (9–12) not used by an Encoder provides a latched
strobe input function (Figure 1-3). These inputs are shared with the four configurable
hardware outputs controlled by range comparators 5–8. In addition to the functions
described below, the status of each input 9–12 is reported as a %I bit.
The rising or falling edge (configurable) of each input latches the latest encoder position
as a strobe value (reported via %AI data) and sets a %I strobe status bit. The strobe latch
%I bit is reset by a corresponding %Q bit controlled by the PLC. Once the strobe data is
latched, another strobe input will not change the data until the %I strobe status bit is
reset. A configuration option allows range comparator 5–8 outputs to be used as
additional enable bits for the latched strobe functions. Range comparator 5 can be
configured to enable the input 9 strobe latch. Range comparator 6 can be configured to
enable the input 10 strobe latch, etc.
Time Measurement Function
The input time measurement function (Figure 1-3) provides two timers using input pairs
9–10 and 11–12. Each timer can be configured to operate in two modes:
Single Input Timer Operation (default mode)
One edge of the second input (10 or 12) of each pair starts a timer with 1 ms resolution.
The opposite edge of the same input halts the timer. The timer value is reported to the
PLC using one word of %AI data for each timer. The input edge configured to set the
strobe latch for inputs 10 or 12 is also used to start the associated timer.
Dual Input Timer Operation
The second input (10 or 12) of each pair starts a timer with 1 ms resolution. The first
input (9 or 11) of each pair halts the timer. The timer value is reported to the PLC using
one word of %AI data for each timer. The input edge configured to set the strobe latch
for each input is also used to start/stop the associated timer
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