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MELSEC-
A
12 CONTROL AUXILIARY FUNCTIONS
Condition 1: Number of output pulses
(a) This is the number of pulses that can be output to the servo amplifier when
positioning is performed 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 to the servo amplifier.
[–32768 (number of feedback pulses)] [number of output pulses] [32768 (number of feedback pulses) – 1]
(b) The address increasing direction from the zero point is positive and the
address decreasing direction from the zero point is negative.
Zero point
0
Negative pulse output
Positive pulse output
-214748364.8 214748364.7
Unit: m
(c) The following indicates the number of output pulses that changes depending
on the number of feedback pulses.
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) Any of the following positioning addresses can be specified for the D75P2.
When the unit is mm: –214748364.8 ( m) to 214748364.7 ( m)
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 when 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 for different units, the
following example uses the unit of mm.