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3 SPECIFICATIONS
3.2 Function List
Name
Linear counter function
Ring counter function
Coincidence output function
Coincidence detection
interrupt function
Preset function
Disable count function
Latch counter function
Counter
function
Sampling counter function
selection
Periodic pulse counter
function
The functions can be used in combination. However, only either one of the linear counter function or ring
counter function can be used, and only one of the four counter functions can be selected.
3 - 4
The QD62(E/D) functions are listed below.
Values from –2147483648 to 2147483647 can be counted. If the
count exceeds the range, this function detects an overflow.
Repeatedly executes counting between the ring counter
maximum and minimum values.
Compares the coincidence output point of any preset channel
with the present counter value, and outputs the ON/OFF signal.
Generates an interrupt signal to the PLC CPU when coincidence
is detected, and starts the interrupt program.
Rewrites the present counter value to any numeric value.
Performs preset using the sequence program or external preset
input.
Stops the pulse count while the count enable command is being
executed.
Stores the present counter value at the time the counter function
selection start command signal is input in the buffer memory.
Counts the pulses that are input during the preset sampling time
period from the time the counter function selection start
command is input, and stores the count in the buffer memory.
While the counter function selection start command signal is
being input, stores the present value in the buffer memory at
preset interval.
Function
MELSEC-Q
Reference section
Section 5.2.1
Section 5.2.2
Section 5.3
Section 5.4
Section 6.2
Section 6.3
Section 6.4
Section 6.5
3 - 4
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