Delta DVP-20PM

3 Devices
present value of the counter will be cleared. If a power cut occurs when a latching counter counts, the
present value of the counter and the state of the contact of the counter will be retained, and the latching
counter will not continue counting until power is restored.
4. If a counter counts up from the present value 2,147,483,647, the next value following 2,147,483,647
will be -2,147,483,648. If a counter counts down from the present value -2,147,483,648, the next value
following -2,147,483,648 will be 2,147,483,647.
Example:
LD X10
OUT M1255
LD X11
RST C255
LD X12
DCNT C255 K-5
LD C255
OUT Y0
C255
Y0
X12
C255 K-5DCNT
X11
C255RST
X10
M1255
1. M1255 is driven by X10. The state of M1255 determines whether C255 counts up or counts down.
2. If X11 is turned form OFF to ON, the instruction RST will be executed, the present value of C255 will
become 0, and the contact will be OFF.
3. If X12 is turned form OFF to ON, the present value of the counter will increase by one or decrease by
one.
4. If the present value of the counter C255 increases from K-6 to K-5, the contact C255 will be turned form
OFF to ON. If the present value of the counter C255 decreases from K-5 to K-6, the contact C255 will
be turned from ON to OFF.
5. If users move a value greater than the setting value of C255 to C255 by means of the instruction MOV,
the contact C255 will be ON, and the present value of the counter will become the setting value next
time X11 is turned from OFF to ON.
X10
X11
X12
The output
contact is ON.
Y0,C208
Contact
C208 counts.
Present value
Increasing IncreasingDecreasing
0
1
2
3
4
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
0
-7
-6
-5
-4
-3
DVP-20PM Application Manual
3-11