Справочник Пользователя для Mitsubishi Electronics QD75D

12 - 52

MELSEC-Q

12 CONTROL SUB FUNCTIONS

[3] Absolute position signal transmission procedure

(1) Figure 12.34 shows the outline of the absolute position signal transmission

procedure between the servo amplifier and the PLC system (PLC CPU,

QD75, I/O module).

Refer to the operation manual of the servo amplifier for details on the

communication between the servo amplifier and the PLC system.

(2) Errors during communication

(a) If the system expires during communication, an error "ABS transmission

timeout" (error code: 213) will occur.

(b) If the transmission data causes a sum error, an error "ABS transmission

SUM" (error code: 214) will occur.

Refer to Section 15.2 "List of errors" for the remedial method to be taken
when an error occurs.

PLC CPU

[Dedicated
instruction]

ABRST1

ABRST2

ABRST3

ABRST4

Servo amplifier

I/O module

Servo ON signal

ABS transmission
mode

ABS request

Transmission data

preparation completed

ABS bit0

ABS bit1

Current position
data

Data transmission

QD75

Md.20
Current feed value
Md.21
Machine feed value

Fig. 12.34 Absolute position signal transmission procedure

Refer to Chapter 14 "Dedicated instructions" for details of the dedicated instructions.