Mitsubishi Electronics fx3u

/FX

3UC

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

Common Items

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 FX3U 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 FX3U/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