Mitsubishi Electronics fx3u

/FX

3UC

PLC User's Manual - Positioning Control Edition

Built-in Positioning Functions

7 Absolute Position Detection System (Absolute Current Value Read)-ABS Instruction

7.2 List of Related Devices

B - 108

7.2 List of Related Devices

→ For details on the related devices, refer to Section 4.1 to Section 4.4.

1. Special auxiliary relays

The following table shows the related special auxiliary relays.

Note that Y000, Y001, Y002, and Y003 are devices that determine the pulse output destinations.

→ For details on PLSY (FNC57), PWM (FNC58), and PLSR (FNC59) instructions, refer to the

programming manual.

*1. Y002 is not available in 14-point and 24-point type FX3G PLC.

*2. Devices related to Y003 (pulse output destination) are only valid if two FX3U-2HSY-ADP adapters are

connected to the FX3U PLC.

2. Special data registers

The following table shows the related special data registers. Note that Y000, Y001, Y002, and Y003 are

devices that determine the pulse output destinations.

*1. Y002 is not available in 14-point and 24-point type FX3G PLC.

*2. Devices related to Y003 (pulse output destination) are only valid if two FX3U-2HSY-ADP adapters are

connected to the FX3U PLC.

7.3 Function and Operation

Connect an MR-H, MR-J2(S), or MR-J3 servo motor (with absolute position detection function) manufactured

by Mitsubishi to your system, and use this instruction to read out the absolute position (ABS) data. The data

will be converted into a pulse value before being read out.

1) For , specify the first number of the device that inputs the absolute position (ABS) data from the

servo amplifier. Number of occupied points: 3 ( , +1, +2)

2) For , specify the first number of the device that outputs the absolut e position (ABS) data control

signal to the servo amplifier. Be sure to use transistor outputs for the PLC outputs.

Number of occupied points: 3 ( , +1, +2)

3) For , specify the absolute position (ABS) data (32-bit value) storage device number to store the

data read out from the servo amplifier. Handle the absolute position (ABS) data as follows:

- To use the built-in pulse output function, be sure to specify the following current value registers for the

read-out ABS data:

*1. Y002 is not available in 14-point and 24-point type FX3G PLC.

*2. Devices related to Y003 (pulse output destination) are only valid if two FX3U-2HSY-ADP adapters are

connected to the FX3U PLC.

Device number Function Attribute Refer to

Y000 Y001 Y002*1 Y003*2

M8029 "Instruction execution complete" flag Read only Subsection

4.4.2

M8329 "Instruction execution abnormal end" flag Read only Subsection

4.4.2

Device number Function Data

length

Initial

value Refer to

Y000 Y001 Y002*1 Y003*2

D8340 Low-

order D8350 Low-

order D8360 Low-

order D8370 Low-

order

Current

value

(PLS)

32-bit 0 Subsection

4.4.1

D8341 High-

order D8351 High-

order D8361 High-

order D8371 High-

order

Y000 Y001 Y002*1 Y003*2

D8341,D8340 D8351,D8350 D8361,D8360 D8371, D8370

Command

input

FNC 155

DABS S

•