4.A2CCPU
---------------------
MELSEC·A
4.5
Devices
Devices indicate contacts, coils, timers, etc. used in
the
PC program opera- I
tion.
4.5.1 Device
list
Table 4.11 shows the devices
and
their ranges to be used with
the
PC.
Devices indicated with an asterisk (*) can be set as appropriate by setting
the
ranges with parameters using a peripheral device.
For details of parameter setting, see Section
4.4.
Table
4.11
Device
List
Device
Application
Range
(Number
of
pointe)
Explanat.lon
Provides
PC
command
and
data
from
external
X
Input
device, e.g. pushbutton,
select
switch, limitswitch,
digital switch.
X, YOto 1FF (Number of X + Y = 512)
Provides program control
resultto
external device,
Y
Output
e.g.
solenoid,
magnetic
switch,
aignallight,
digital
display.
Special
relay M9000 to 9255 (256)
Predefined auxiliary relay
for
special purpose and
for
use in
the
PC.
f--
M
•
Internal relay MOto 999 (1000)
Auxiliary relay in
the
PC
which
cannot
be
output
directly.
• L
Latch relay
Ll000
to
2047
(1048)
Number
of
Auxiliary
relay
in
the
PC
which
cannot
be
output
Ms + Ls + directly. Backed up
during
power failure.
S.
=2048
Can be used by setting
Used in
the
same manner as an Internal relay (M),
•
S Step relay
e.g. as a relay
indicating
the stage
number
of a
the
parameter (0)
step-by-step process operation program.
Internal relay
for
data link
which
cannot
be output.
B Link relay BOto 3FF (1024) May be used as an internal relay if not set
for
link
parameter.
Used to detect a fault. When
switched
on
during
F
Annunciator
FOto 255 (256)
RUN by a
fault
detection program, stores a
corresponding
number
in special register D.
100 msec
timer
TOto 199 (200)
*
T
10 msec
timer
T200 to 255 (56)
Up timers available in 100 msec, 10 rnsec
and
100
msec retentive types.
100 msec
Can be used by setting
the
retentive
timer
paramater. (0)
C
Counter
COto 255 (256)
Up
counters
available
in
normal
and
interrupt
type
e.
Data register
DO
to 1023 (1024) Memory for storing PC data.
-
0
Special
09000 to 9255 (256)
Predefined
data
memory
for
special purpose.
register
W
Link
register WOto 3FF (1024)
Data register
for
use with
data
link.
Can be used by setting the
Used for
data
link. In
the
ranger
which
In
not
set
•
R File register
by link parameters,
file
registers can be used as
parameter. (0)
data registers
4-58
•
•
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