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PLC User's Manual - Positioning Control Edition
Built-in Positioning Functions
6 Mechanical Zero Return (DSZR/ZRN Instruction)
6.3 Zero Return (ZRN Instruction)
B - 105
A
Common Items
B
Built-in
Positioning
Functions
Apx.
Example
Connection
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
related relay (special auxiliary relay, special data register) below.
→ For details on related flags, refer to Section 4.1 to Section 4.4, or Subsection 6.2.2.
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 is turned on, the speed will be reduced to the creep
speed specified by .
4) If the near-point signal (DOG) specified by is turned off, the pulse outputting operation will be
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.
→ For details on "Instruction execution complete" flag, refer to Subsection 4.7.4.
*1. Note that the zero return speeds shown in the following table will not apply.
Pulse output destination device Zero return speed
= Y000
D8347,D8346
= Y001
D8357,D8356
= Y002
D8367,D8366
= Y003
D8377,D8376
D
S
1
S
3
S
2
S
3
Maximum speed
(D8344,D8343)
Zero return speed
*1
Deceleration
time
(D8349)
Bias speed
(D8342)
Acceleration
time
(D8348)
DOG
Creep speed
CLEAR signal
Y004
Front endRear end
1 ms or less
20 ms + 1scan time (ms)
S
2
•
ON
"Instruction
execution
complete" flag
M8029
When the instruction is turned off, M8029 is turned off.
S
1
•
S
3
•
D
1
D
1
D
1
D
1