4.
A2CcPU
/MELSEC-A
4.5
Devices
Devices indicate contacts, coils, timers, etc. used in the
PC
program operation.
4.5.1
Device
list
Table
4.10
shows
the devices and their ranges to be used with the
PC.
Devices indicated with an asterisk
(8)
can
be
set as appropriate by
setting the ranges with parameters using a peripheral device.
For details
of
parameter setting,
see
Section
4.3.
Dwice
Expknm
Applk.tion
Range
(Numbor
of
points)
Provides PC command and data from external device,
X
ea
pushbutton,
select
switch, limit switch, digital
InDut
(Number of
X
+
Y
=
512)
X,
YO
to
IFF
output
I
switch.
-1
Provides program control result
to
external device,
e.g.
solenoid, magnetic switch, signal light, digital display.
I
~ ~~~
Special relay
M9000
to
9255
(2561
--M
*
MO
to
999
(1OOO)
Internal relay
x
=
2048
Number of
Ms+Ls+Ss
LlooO
to
2047 (10481
Latch relay
L
Step
re,ay
Can be used by setting the
parameter
(01
Predefined auxiliary relay for special purpose and for
use in the
PC.
Auxiliary relay in the
PC
which cannot be output
directly.
Auxiliary relay in the PC which cannot be output
directly. Backed up during power failure.
Used in the same manner as an internal relay
(MI,
e.g.
as a relay indicating the stage number of a step-by-
step process operation program.
BO to
3FF (1024)
Annunciator
FO
to
255 (2561
Internal relay for data link which cannot
be
output.
May be used as an internal relay if not set for link
parameter.
by
a fault detection program, stores
a
corresponding
Used to detect
a
fault. When switched on during RUN
number in special register D.
100
ms timer
Up timers available in
100
ms,
10
rns
and
100
ms
T200
to
255
(561
10
ms timer
TO
to
199 (200)
100
ms retentive
Can
be
used by setting the parameter.
.
retentive types.
timer
(01
C
Up counters available in normal and interrupt
types.
CO
to
255 (2561
Counter
D
Data register
Memory for storing
PC
data.
DO
to
1023 (1024)
Special register
Predefined data memory for special purpose.
Dgooo
to
9255 (256)
I
I
W
I
Link register
I
WO
to
3FF
(10241
1
Data register for use with data link.
I
I
I
R
I
File register
1
Can be used by setting the parameter.(O)
I
for
data
link.
In
the
range
which
is
not
set
by
link
parameters, file registers can be used as data registers.
I
Table
4.10
Devh
List
(Continue)
Ll
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082384
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