MELSEC-A
3. SPECIFICATIONS
3 - 8
3.3 Functions
The following table lists the high-speed counter module functions.
Name Description Refer To
Coincidence output function
Outputs an ON/OFF signal in a specified output status, comparing
it with the present value.
Section
6.1
Preset function
Counting alternates between the preset value and the ring counter
value.
The preset operation can be done either by a sequence program or
by an external preset input.
Section
7.1
Ring counter function Counting alternates between the preset value and the ring counter.
Section
8.1
Counter function selection
Count disable function Stops counting pulses while the count enable command is ON.
Section
9.2
Latch counter function
Stores the present value of the counter into the remote registers
when the signal of the counter function selection start command is
input.
Section
9.3
Sampling counter function
After the signal of the counter function selection start command is
input, input pulses are counted during a preset sampling period
and stored into the remote registers.
Section
9.4
Periodic pulse counter function
While the signal of the counter function selection start command is
input, input pulses are stored into the remote registers at preset
intervals.
Section
9.5
POINT
(1) These functions can be used together. However, only one function can be
selected from the counter function selection.
(2) The preset function and counter function selection can be executed not only
through a sequence program, but also through external input.
• To use the preset function, apply voltage to the PRESET terminal.
• To use a function from the counter function selection, apply voltage to the
F.START terminal.
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