Omron HOME SECURITY SYSTEM - MOTION SENSOR FQM1-MMA21 - Manual (Page 181)

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Pulse Inputs Section 7-5
High-speed Counter Movement (Mode 1) Specifications
Note (1) When using mode 1 with a circular counter, set the maximum circular val-
ue to 10 or higher.
(2) In mode 1, the Motion Control Module outputs the change as the differ-
ence in the count measured each sampling period. The output change
varies, so determine how to manage the output value in the user program
when the counter is reset or the INI(880) instruction is executed to
change the PV during sampling.
Monitoring a High-speed
Counter’s Frequency
(Mode 2) Mode 2 is supported by high-speed counter 1 only.
This function monitors the input pulse’s frequency from the high-speed
counter movement value. The frequency is stored in A604 and A605. Status
Flag A608.06 can be checked to determine whether or not the frequency is
being measured.
Note (1) The frequency value stored in the Auxiliary Area is refreshed during the
Motion Control Module’s I/O refreshing.
(2) The frequency measurement can be performed only with high-speed
counter 1. The frequency cannot be measured with high-speed counter 2.
(3) When measurement is started, the measurement direction (A610.03)
must be specified to match the direction of the input pulses being mea-
sured.
The pulse input’s counter data display must be set to frequency measurement
(mode 2) in the System Setup in advance.
Item Specifications
Applicable pulse
input Either pulse 1 (high-speed counter 1) or pulse 2 (high-speed
counter 2) can be used.
Displayable move-
ment 0000 0000 to FFFF FFFF
Note The software can generate the range of values shown
above, but some hardware may not be able to display
the full range due to input limitations.
Sampling time Can be set to the cycle time or a fixed time between 1 and
9,999 ms.
Operating conditions In the System Setup, set the pulse input’s counter data display
to counter movements (mode 1) and specify the sampling
time.
Word Bits Function Details
A604 and
A605 00 to 15 High-speed Counter 1
Monitor Data Contains the frequency measure-
ment.
The frequency calculated from the
high-speed counter PV is stored in
8-digit hexadecimal (0000 0000 to
0007 A120 hex = 0 to 500 kHz).
A608 06 High-speed Counter 1
Status Flag Measuring Flag
OFF: The high-speed counter fre-
quency measurement opera-
tion is stopped.
ON: The high-speed counter fre-
quency is being measured.
System Setup Function Details
Pulse Input Tab
Page
Counter data display
Specifies the counter 1 mea-
surement mode. 2 hex: Frequency (mode 2)