Mitsubishi A1SD75M1, User Manual

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12 - 61
MELSEC-A
12 CONTROL AUXILIARY FUNCTIONS
Condition 1. Number of output pulses
(a) It indicates the number of pulses that can be output to the servo amplifier
when positioning is started from the zero point in the absolute position
detection system. In the absolute position detection system, pulses within
the range of the following expression can be output.
[ 32768 (number of feedback pulses)] [number of output pulses] [32768 (number of feedback pulses) 1]
(b) The direction in which the address increases from the zero point is positive,
and the direction in which the address decreases from the zero point is
negative.
Zero point
0
Negative pulse output
Positive pulse output
-214748364.8 214748364.7
Unit :
µ
m
(c) The number of output pulses changes depending on the number of
feedback pulses as indicated below.
•
When the number of feedback pulses is 8192 (pulse):
268435456 (pulse) to 268435455 (pulse)
•
When the number of feedback pulses is 16384 (pulse):
536870912 (pulse) to 536870911 (pulse)
Condition 2. Positioning address
(a) The positioning addresses that can be specified for the AD75 are as
indicated below.
•
When the unit is mm: 214748364.8 (µm) to 214748364.7 (µm)
•
When the unit is inch: 21474.83648 (inch) to 21474.83647 (inch)
•
When the unit is pulse: 2147483648 (pulse) to 2147483647 (pulse)
•
When the unit is degree:0° to 359.99999°
[Calculation of positioning address and concept of absolute position detection system]
Calculate the positioning address with the following expression.
(Positioning address) = (movement amount per pulse) (number of output pulses)
+ (zero point address) ......................................... Expression 1
1. Concept in the case where the unit is mm, inch or pulse
The range that satisfies Condition 1 and Condition 2 can be used as the
positioning address of the absolute position detection system.
The range that does not satisfy Condition 1 and Condition 2 cannot be used as
the positioning address of the absolute position detection system.
Since the concept of the positioning address is the same, an example of the case
where the unit is mm is given below.