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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
<Absolute position detection request>
QD75
<Current position data>
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.