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Absolute position detection system – MITSUBISHI ELECTRIC MELSERVO MR-J2S- A User Manual

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15. ABSOLUTE POSITION DETECTION SYSTEM

(4) Differences between A1SD75 and A1SD71

The sequence programs shown in (2) of this section differ from those for the A1SD71 in the following
portions. 1) to 20) in the following sentences indicate the numbers in the programs given in (2) of this
section.
(a) Devices used

Since the A1SD75 is a one-slot module which occupies 32 I/O points, the I/O devices are different,
as indicated by 1) and 2), from those of the two-slot A1SD71 which occupies 48 point. The A1SD75
uses the devices indicated in the following table, and its D registers and M contacts are different as
indicated by 3) and 4).

Devices

Device name

Axis 1

Axis 2

Axis 3

Application

Bit device

:Data at ON

Data register

:Stored data

X0

A1SD75 ready

Not ready/ WDT error

X4

X5

X6

BUSY

BUSY(running)

Input

XA

XB

XC

Error detection

Error detection

Y10

Y11

Y12

Positioning start

Start being requested

Y13

Y14

Y1C

Axis stop

Stop being requested

Y16

Y18

Y1A

Forward rotation jog start

Forward rotation being started

Y17

Y19

Y1B

Reverse rotation jog start

Reverse rotation being started

Output

Y1D

Programmable controller ready

Programmable controller CPU
normal

M0

Parameter setting completion flag

Setting complete

M1

Flash ROM registration processing
flag

Processing

M2

M3

M4

Axis error reset requesting flag

Requesting

M100

A1SD75 normal flag

A1SD75 normal

M101

Initial error reset completion flag

Error reset complete

M102

All BUSY signal OFF flag

All BUSY signal OFF

internal relay

M103

A1SD75 operable flag

Operable

D100

Flash ROM registration results

Registration results

D101

D102

D103 Axis error code

Error code

D104

D105

D106 Axis warning code

Warning code

Data register

D107

D108

D109 Axis error reset results

Axis error reset results

(b) ABS sequence program example

1) Initial setting

To reset the error of the A1SD75, the program 5) is added to reset all output signals at start-up.
The axis error reset buffer memory address is changed from 201 to 1154 (axis 1) and the slot
number from H0001 (slot number 1) to H0000 (slot number 2) 6).

2) Absolute position polarity, A1SD75 rotation direction setting detection

The slot number and buffer memory of the X-axis rotation direction parameter reading area are
changed from [FROMP H0001 K7872 D8 K1] to [FROMP H0000 K5 D8 K1] 8).
The rotation direction parameter masking area is changed from [WAND H0004 D8] to [WAND
H0001 D8] 9).

3) Reversing absolute position polarity

The rotation direction judging area is changed from [

=

D8 K4] to [

=

D8 K1] 10).

4) Reading checksum 6 bits, reading ABS data 32 bits

The 4 bits reading area is changed from [MOV K1 X30D5] to [MOV K1X20 D5] 11).

5) Restoring absolute position data

The slot number and buffer address of the A1SD75 home position address reading area are
changed from [DFROP H0001 K7912 D9 K1] to [DFROP H0000 K72 D9 K1] 12)