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PLC User's Manual - Positioning Control Edition
Built-in Positioning Functions
6 Mechanical Zero Return (DSZR/ZRN Instruction)
6.2 DOG Search Zero Return (DSZR Instruction)
B - 93
A
Common Items
B
Built-in
Positioning
Functions
Apx.
Example
Connection
2) For , specify the zero-phase signal input number in the range of X000 to X007. To specify the logic
of this zero-phase signal, turn the "Zero point signal logic reverse" relay on or off as shown in the
following table.
If the same input is specified for both the near-point signal and the zero-phase signal, the logic of the zero-
phase signal will be specified by the device of the near-point signal (DOG), and not by one of the following
devices. In this case, the operation will be performed at the front and rear ends of the near-point signal
(DOG) without using the zero-phase signal. This is similar to the operation of the ZRN instruction.
3) For , specify a pulse output number in the range of Y000 to Y003.
4) For , specify the rotation direction signal output device number.
When a high-speed output special adapter is used as a destination for pulse output on a FX
3U PLC, use
the output shown in the following table for rotation direction signals.
When a built-in transistor output is used as a destination for pulse output on a FX
3U/FX3UC/FX3G PLC,
use transistor output for signals rotation direction.
The rotation direction ON/OFF status of the specified device is shown in the following table.
During instruction execution, however, do not use the output for other purposes.
5) Zero return direction
To specify the zero return direction, turn "zero return direction specification" relay on or off as shown in
the following table.
Pulse output
destination device
"Zero point signal logic
reverse" flag
Description
= Y000
M8346
OFF: Positive logic (Turning on the input will turn on the
near-point signal.)
ON: Negative logic (Turning off the input will turn on the
near-point signal.)
= Y001
M8356
= Y002
M8366
= Y003
M8376
High-speed output special
adapter connection position
Pulse output
Rotation direction
output
1st adapter
= Y000
= Y004
= Y001
= Y005
2nd adapter
= Y002
= Y006
= Y003
= Y007
ON/OFF status of device
specified by
Rotation direction (increase/decrease current value)
ON
Forward rotation (Outputting pulses from will increase the
current value.)
OFF
Reverse rotation (Outputting pulses from will decrease the
current value.)
Pulse output
destination device
"Zero return direction
specification" relay
Description
= Y000
M8342
To perform zero return in the
forward rotation direction: Turn on the relay.
To perform zero return in the
reverse rotation direction: Turn off the relay.
= Y001
M8352
= Y002
M8362
= Y003
M8372
S
2
D
1
D
1
D
1
D
1
D
1
D
2
D
1
D
2
D
1
D
2
D
1
D
2
D
1
D
2
D
2
D
2
D
1
D
1
D
1
D
1
D
1
D
1