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12 CONTROL SUB FUNCTIONS
Servo amplifier
<Absolute position detection request>
Current position
Data transmission
data
[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.
I/O module
Servo ON signal
ABS transmission
mode
ABS request
Transmission data
preparation completed
ABS bit0
ABS bit1
Fig. 12.34 Absolute position signal transmission procedure
Refer to Chapter 14 "Dedicated instructions" for details of the dedicated instructions.
PLC CPU
[Dedicated
instruction]
<Current position data>
ABRST1
ABRST2
ABRST3
ABRST4
12 - 52
MELSEC-Q
QD75
Md.20
Current feed value
Md.21
Machine feed value
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Troubleshooting
