Mitsubishi FX3G Series User Manual page 141

FX /FX /FX PLC User's Manual - Positioning Control Edition
3G 3U 3UC
Built-in Positioning Functions
1. Zero return operation
Zero return operation is described below assuming that Y000 is specified as the pulse output destination
device . If Y001, Y002, and Y003 are specified, it is necessary to change the output number of each
D
related relay (special auxiliary relay, special data register) below.
1) Execute the ZRN instruction to carry out zero return.
2) Transfer operation will be performed at the zero return speed specified by
3) If the near-point signal (DOG) specified by
speed specified by
4) If the near-point signal (DOG) specified by
immediately stopped.
5) If the CLEAR signal output function (M8341) is enabled (set to ON), the CLEAR signal (Y004) will be
turned on within 1 ms after stopping the pulse outputting operation, and will be kept ON for "20 ms + 1
scan time (ms)".
6) The current value register (D8341, D8340) will be reset to "0" (will be cleared).
7) "Instruction execution complete" flag will be turned on, and the zero return operation will be completed.
CLEAR signal
Y004
"Instruction
execution
complete" flag
M8029
*1. Note that the zero return speeds shown in the following table will not apply.
Pulse output destination device
→ For details on related flags, refer to Section 4.1 to Section 4.4, or Subsection 6.2.2.
.
S
2
→ For details on "Instruction execution complete" flag, refer to Subsection 4.7.4.
Creep speed •
S
2
DOG
Rear end
1 ms or less
20 ms + 1scan time (ms)
ON
When the instruction is turned off, M8029 is turned off.
= Y000
D
1
= Y001
D
1
= Y002
D
1
= Y003
D
1
6 Mechanical Zero Return (DSZR/ZRN Instruction)
is turned on, the speed will be reduced to the creep
S
3
is turned off, the pulse outputting operation will be
S
3
Deceleration
time
(D8349)
Maximum speed
(D8344,D8343)
Zero return speed
•
S
1
•
S
3
Front end
Zero return speed
D8347,D8346
D8357,D8356
D8367,D8366
D8377,D8376
6.3 Zero Return (ZRN Instruction)
.
S
1
Acceleration
time
(D8348)
*1
Bias speed
(D8342)
B - 103
A
B
Apx.