Delta Electronics Programmable Logic Controller DVP-PLC - Manual (Page 491)

9 Application Instructions API 150-199
DVP-PLC Application Manual 9-19
API Mnemonic Operands Function
156 D ZRN Zero Return
Controllers
ES/EX/SS SA/SX/SC EH/SV
Bit Devices Word Devices Program Steps Type
OP X Y M S K H KnX KnY KnM KnS T C D E F
S
1
* * * * * * * * * * *
S
2
* * * * * * * * * * *
S
3
* * * *
D *
ZRN: 9 steps
DZRN: 17 steps
PULSE 16-bit 32-bit
ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV
Operands:
S
1
: Zero return speed S
2
: Creep speed S
3
: Near p oint signal (DOG) D: Pulse output device (please use
transistor output module)
Explanations:
1. When S
1
and S
2
are used in device F, only 16-bit instruction is applicable.
2. S
1
and S
2
of SC series MPU only support device K, H and D. S
3
of SC series MPU only supports device X10
and X11.
3. Flag: see remarks of API 155 ABSR and API 158 DDRVI for more details.
4. S
1
is the starting speed of zero return operation. For EH/EH2/SV series MPU, the 16-bit instruction can
designate the range of the speed, which is 10 ~ 32,767Hz and the range designated by the 32-bit instruction is
10 ~ 200,000Hz. If the designated speed is slower than 10Hz, the zero return will operate at 10Hz and when
the designated speed is faster than 200KHz, the zero return will operate at 200KHz. For SC series MPU, the
32-bit instruction can designate the range of speed , which is 100 ~ 100,000Hz. If the designated speed is
slower than 100Hz, the zero return will operate at 100Hz, and when the designated speed is faster than
100KHz, the zero return will operate at 100KHz.
5. S
2
is the designated low speed after the near point signal (DOG) is On. EH/EH2/SV series MPU can designate
the range of S
2
, which is 10 ~ 32,767Hz and SC series MPU can designate the range 100 ~ 100,000Hz.
6. S
3
is the designated near point signal (DOG) input (input from A contact). In EH/EH2/SV series MPU, if devices
other than the external output device (X10 ~ X17), e.g. X, Y, M, S are designated, they will be affected by the
scan period, resulting in dispersion of the zero point. In addition, please note that the MPU cannot designate
the same input points X10 ~ X17 as those designated by DCNT and PWD instructions. SC series MPU can
only designate X10 and X11 and cannot designate the same input points as those designated by DCNT
instruction.
7. EH series MPU has two groups of A/B phase pulse output, CH0 (Y0, Y1) and CH1 (Y2, Y3); EH2/SV series
MPU has four groups of A/B phase pulse output, CH0 (Y0, Y1), CH1 (Y2, Y3), CH2 (Y4, Y5) and CH3 (Y6, Y7).
See remarks for the setup methods.
8. Zero return output device in different models
Model SC MPU EH MPU EH2/SV MPU
Zero return output Y10, Y11 Y0, Y2 Y0, Y2, Y4, Y6
9. When executing API 158 DRVI (releative positioning) or API 159 DRVA (absolute positioning), PLC will
automatically store the increasing or decreasing forward/reverse pulses in the present value registers. For