3.
SPECIFICATIONS
/MELSEC-A
I/O
interface electrical details
Pin Number
Circuit
x
Y.
I
Signal
.XIS
8x1s
1
Description
?A
Power supply (+)
5
to 24V DC (externel supply)
(1) Low indicates
servo
drive unit
is
serviceable.
12)
AD71 checks
the
drive unit ready signal prior to start.
If not reedy. the AD71 outputs a zeroing request.
(3) Arrange for drive unit errors, e.g. control power error
to set
this
signal high.
14) Switching this signal to high during positioning stops
the operation. Resetting the signal will not restart
omration
(1) Low to stop positioning. Signal duration 20ms or
(2) Input switches start signal (STARTI off (high). Start
more.
signal will not
then
restart.
(1) Switched to low by zero point actuator.
(2) For zeroing information,
see
Section 3.4.2, page 3-18.
Refer to Table 3.10.
lA
3A
Inching A phase
PULSER A
.-.-.
38
I
4A
..--
46
I
Inching
8
phase
PULSER
B
Refer to Table 3.10.
(1) Switched to low by encoders with zero-phase channel.
(21 For zeroing information, see Section 3.4.2, page 3.18.
1 OA
.
.
-.
Zero-phase signal
1 08
-
PGO
(1) Low while positioning.
(21 On (low) during feed
pulse
Output
and dwell. Used as
a brake release signal for servos with rnffhanical
brakes. Feed pulse output after this signal turns on.
Start
START
13R
I
Given before and after zeroing. Resets the deviation in the
servo
unit error detector.
-
2Oms (1st time)
2Oms
(2nd time)
Before feed
Dulse
Outout After feed
Dulse
outwt
14A
.--.
148
Error detector
clear
CLEAR
20A
(+)
24V power
(+)
5
to 12v powe
208
5
to 24V DC (external supply)
17A and 20A for 24V DC.
178 and 208 for
5
to 12V DC.
8
type
I
I
Forward and reverse feed pulses
PULSE
m-j
SIGN
7
I
I
1 1
n+E
4-
cu
.-
Direction sign
1
25ms-
-
+
direction travel
-
direction trave
SlGN
PULSE F
m-
i
1
~ ~ ~~~~~
J
Select A
or
B
type
by
parameter
setting.
(For
details, refer
to
Section
3.4.1.)
Table
3.1
1
AD71
I/O
Interface
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