Delta DVP-PLC, Applications Manual

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7 Application Instructions API 50-99
D V P - P L C A P P L I C AT I O N M A N U A L
7-18
Program Example 2:
1. Use DHSZ instruction for high/low speed stop control. C251 is an A-B phase high speed counter and DHSZ only
performs comparison output when there is a C251 counting pulse input. Therefore, even when the present value
in the counter is 0, Y10 will not be On.
2. When X10 = On, DHSZ will require that Y10 has to be On when the present value in the counter ≤ K2,000. To
solve this requirement, you can execute DZCPP instruction when the program was first RUN and compare
C251 with K2,000. When the present value in the counter ≤ K2,000, Y10 will be On. DZCPP instruction is a
pulse execution instruction and will only be executed once with Y10 being kept On.
3. When the drive contact X10 = Off, Y10 ~ Y12 will be reset to Off.
X10
RST C251
ZRST Y10 Y12
M1000
DCNT C251 K10000
X10
DZCPP K2000 K2400 C251 Y10
DHSZ K2000 K2400 C251 Y10
4. The timing diagram
2,000
2,400
0
X10
Y10
Y11
Y12
0
high speed
forward
low speed
forward
Stop
Speed of variable speed
transmission equipment
Present value in
counter C251
Program Example 3:
1. Program Example 3 is only applicable to EH/EH2/SV series MPU.
2. The multiple set values comparison mode: If
D
of DHSZ instruction designates a special auxiliary relay M1150,
the instruction will be able to compare (output) the present value in the high speed counter with many set
values.