Справочник Пользователя для Mitsubishi Electronics AJ65BT-D75P2-S3

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MELSEC-A

12 CONTROL AUXILIARY FUNCTIONS

[3] Absolute position signal transfer procedure

(1) The outline of the absolute position signal transfer procedure

between the servo amplifier and D75P2 is shown in Fig. 12.33.

For details of communication between the servo amplifier and PLC system, refer
to the servo amplifier side instruction manual.

(2) About errors during communication

(a) A time-out that occurs during communication results in error "ABS transfer

time-out" (error code: 213).

(b) A transfer data sum error results in error "ABS transfer check sum" (error

code: 214).

For remedies, etc. at error occurrence, refer to section "14.3 List of errors".

D75P2

Servo ON signal

Transmission data ready
ABS bit0
ABS bit1

Current feed value

Machine feed value

Md.30

[RWrn+0 to 1, RWrn+8 to 9]

Servo amplifier

Current position

data

ABS transfer mode
ABS request

Fig. 12.33 Absolute position signal transfer procedure

[4] Precautions during control

(1) When the absolute position detection system has been configured, absolute

position restoration must be performed at least once after power on or reset.
Also, the servo amplifier will not switch on unless absolute position restoration
is completed.

(2) For use in the absolute position detection system, the following control cannot

be performed.



Infinite length feed control in which control is performed in the given

direction only, e.g. a turntable



Control in which the movement amount from the zero point address

exceeds the Condition 1 and Condition 2 ranges given below

When performing positioning in the absolute position detection system, use
the positioning address within the range that satisfies Condition 1 and
Condition 2 given on the next page.
If the positioning address is used in the range that does not satisfy Condition 1
and Condition 2, a normal current value cannot be restored at the time of
absolute position restoration and therefore the positioning address cannot be
used in the absolute position detection system.