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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.

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