Omron HOME SECURITY SYSTEM - MOTION SENSOR FQM1-CM001 Operation Manual page 189

Pulse Inputs
Example 3:
Latching High-speed
Counter PV
ON
Latch Input 1
Enable Bit
OFF
ON
Latch input 1
OFF
ON
Count Latched
Flag
OFF
High-speed
Counter PV
0
Latch register
value 1
166
In this example, pulse input 1 operates a high-speed counter, the high-speed
counter PV is latched, and the captured high-speed counter PV is read. When
the Latch Input 1 Enable Bit is ON and the latch input 1 is turned OFF → ON
externally, the high-speed counter PV is captured to the latch register and the
Count Latched Flag is turned ON during the next I/O refreshing.
The Count Latched Flag is used as a trigger for the PRV(881) instruction to
read the captured high-speed counter PV and the Count Latched Flag is then
turned OFF.
If latch input 1 is turned ON again while the Count Latched Flag is still ON
(before the captured PV has been read by the PRV(881) instruction), the old
captured PV will be refreshed with the new captured PV.
PRV instruction
execution
Clear Latch
Start Latch
Latch Input 1 Count Latched
Enable Bit Flag
A610.08 A608.08
PRV instruction
execution
PRV
#0001 Dummy read of
#0002 latch register
W000
Latch Input 1
A610.08
Enable Bit
PRV
#0001 Read latched high-speed
#0002 counter PV.
D00000
Section 7-5