3 Functions of Devices in DVP-PM
DVP-PM Application Manual
3-11
specified as SV, it will occupy 2 consecutive data registers.
3. PV in the general purpose counter will be cleared when power of DVP-PM is OFF. If the counter is a latched
(accumulative) type, PV and the contact status will be retained, and PLC will resume counting after power is ON
again.
4. When PV reaches up to 2,147,483,647, the next PV will turn to -2,147,483,648. When PV reaches down to
-2,147,483,648, the next PV will turn to 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. X10 drives M1255 to determine whether C255 is a count-up or count-down counter.
2. When X11 goes from OFF to ON, RST instruction will be executed, PV in C255 will be cleared, and the
associated contact will be reset.
3. When X12 goes from OFF to ON, PV in the counter will count up (plus 1) or down (minus 1).
4. When PV in C255 changes from K-6 to K-5 (PV≧SV), the contact of C255 will go from OFF to ON. When PV in
C255 changes from K-5 to K-6 (PV≦SV), the contact of C255 will go from ON to OFF.
5. If you use MOV instruction or PMSoft to send a value bigger than SV to the present value register of C0, when
X1 goes from OFF to ON, the associated contact of counter C0 will be ON and its PV will equal SV.
X10
X11
X12
Contacts Y0,C255
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
Counting up Counting up
Counting down
PV in C255
Status if Y0 was ON
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