Mitsubishi MELSEC Q Series Programming Manual page 351

Program Example
(1) This program uses C0 (Up/Down counter) to count the number of times X0 goes from OFF
to ON after X20 has gone ON.
[Ladder Mode]
[Operation]
X20
X0
X1
C0 present value
C0 contact
Up Down
0 1 2 3 4 5 6 7 6 5 4 3 2 1 0 1 2 3 2 1 0
[List Mode]
Instruction
Step
Up
- - - - - 1 1
UDCNT1
Device
6-149
1
2
3
4
4
6
7
8