Filter
Top Products
76
8.5.1 Reading the counter function selection count value
The counter function selection count value refers to the count value that is stored when the counter function selection
is performed.
When the latch counter, sampling counter, or periodic pulse counter function is performed, the count value is stored in
the corresponding buffer memory areas listed in the table below.
The present value and the counter function selection count values are stored in the buffer memory areas in 32-bit
signed binary.
The buffer memory data is automatically updated by counting operation. The latest count value can be read from the
buffer memory.
● Read the present value and counter function selection count values by two words at a time. If the values are read by one
word at a time, the lower word data and the higher word data will be inconsistent when the count value is updated during
reading, and an incorrect count value may be read.
• Program example
• Inappropriate program example
The present value may change while CH1 Present value (L) (Un\G2) and CH1 Present value (H) (Un\G3) are
read.
● Although the storage addresses differ between the latch count value and periodic pulse count current value, the stored
values are always the same (updated simultaneously). Therefore, when the latch counter function or periodic pulse
counter function is executed, the latch count value and periodic pulse count current value do not hold their previous
values.
Description Present value
Counter function selection count value
Latch count
value
Sampling
count value
Periodic pulse
count
previous value
Periodic pulse
count current
value
Buffer memory address
CH1
Un\G2,
Un\G3
Un\G12,
Un\G13
Un\G14,
Un\G15
Un\G16,
Un\G17
Un\G18,
Un\G19
CH2
Un\G34,
Un\G35
Un\G44,
Un\G45
Un\G46,
Un\G47
Un\G48,
Un\G49
Un\G50,
Un\G51