Delta Electronics Programmable Logic Controller DVP-PLC - Manual (Page 48)

2 Functions of Devices in DVP-PLC
DVP-PLC Application Manual
2-20
(ii) When DHSZ instruction uses new added high-speed counters, it can only use one group of SV in the
comparator.
(iii) The number of SVs in high speed comparison instructions offered by SA/SX series MPU will not decrease
owing to the increasing of high-speed counters.
(iv) If the output device of the high-speed comparison instruction DHSCS requires high-speed output, it is
recommended you use Y10 or Y11 for the output. If you use other general devices, the output will delay
for 1 scan period for its setup or clearing. For example, if I0x0 interruption is set, C243 will correspond to
I020, C245 to I040, and C250 and C255 to I060.
(v) The high speed comparison instruction DHSCR is able to clear the counter, but only the counters used in
the same instruction, e.g. DHSCR K10 C243 C243. This function only applies to 4 special high-speed
counters C243, C245, C250 and C255.
5. Counting modes:
a) The 2-phase 2 inputs counting mode of the high speed counters in ES/EX/SS (V5.5 and above) and
SA/SX/SC series MPU is set by special D1022 with normal frequency, double frequency and 4 times
frequency modes. The contents in D1022 will be loaded in in the first scan when PLC is switched from STOP
to RUN.
Device No. Function
D1022 Setting up the multiplied frequency of the counter
D1022 = K1 Normal frequency mode selected
D1022 = K2 or 0 Double frequency mode selected (default)
D1022 = K4 4 times frequency mode selected
b) Multiplied frequency mode (qr indicates the occurrence of counting)
Counting mode Counting wave pattern
1
(Normal
frequency)
A-phase
B-phase
Counting up Counting down
2
(Dou
ble
freque
ncy)
A-phase
B-phase
Counting up Counting down
2-ph
ase 2 inp
uts
4
(4 times
freque
ncy)
A-phase
B-phase
Counting up Counting down
EH/EH2/SV series MPU supports high speed counters. C235 ~ C240 are program-interruption 1-phase high