
Chapter 3. Instructions
3-4
3.1.10 Counter instructions
Mnemonic
symbol
Function
No.
Ladder symbol
Unit
Contents of processing
CPU
Page
CTU
-
-
○
4
-
37
CTD
-
-
○
4 – 38
CTUD
-
○
4 – 39
CTR
-
○
4 – 41
U CTU
R <S>
Count
Pulse
Reset
↓
↑
Setting value
Counter relay
C xxx
v
Reset
Count
Pulse
Current
value
Output
Setting
value
D CTD
R <S>
Count
Pulse
Reset
↓
↑
Setting value
Counter relay
C xxx
v
Reset
Count
Pulse
Current
value
Output
Setting
value
Reset
Up
Pulse
Current
value
Output
Down
Pulse
Setting
value
U CTUD
R <S>
Up
Pulse
Reset
↓
↑
Setting value
Counter relay
C xxx
v
D
Down
Pulse
Output
Reset
Count
Pulse
Current
value
D CTR
R <S>
Count
Pulse
Reset
↓
↑
Setting value
Counter relay
C xxx
v