APPENDICES
MELSEC-A
I
Table
3.1
List
of
Special
Registers
(Continued)
Related
Related
Number
Name
Stored
Explanation
Special
S_1aI
Data
Relaya
Reglslers
•
Information of I/O modules and remote terminal modules
00:
connected
to
the
A2C is
stored
corresponding
to
station
Absence
number.
of
remote
•
Information
of I/O
modules
and remote
terminal
modules
terminal
is
for
input,
output
and
remote
terminal
module
modules
identification
and
expressed
in 2
bits.
Initial
•
00 :
Absence
of I/O
modules
or
remote
terminal
comrnunica-
modules, or initial communication is
disabled.
I/O
tion
•
01
:
input
module
or remote
terminal
module
09133
module
disabled
•
10 :
Output
module
to
and
01:
•
11 :
Remote
terminal
09140
remote
Input
•
Data
structure
terminal
- -
module
module
or
b15b14
b13b12
b11b10
es b8 b7 ee
b5
b4
b3
b2
b1
bO
infor-
remote
Station Station
Station Station Station
Station Station Station
terminal
09133
mation
6 7 6
5
4
3 2 1
module
Station
Station Station Station Station
Station
Station
Station
10:
16 15 14
13
12
11 10 9
Output
10
Station
Station
Station
Station
Station Station Station Station
module
24 23
22 21
20
19 16
17
11:
Station Station Station Station Station Station Station Station
Remote
56 55
54 53
52
51 50
49
terminal
09140
Station
Station
Station Station Station Statlon
Stalon
Statlon
64
63 62 61 60 59 56 57
•
The
number
of
times
of
retry
performed
to
the
I/O
module
or
remote
terminal
module
which
caused
communication
error
is
stored.
(Retry is
performed
the
number
of
times
set in
09174.)
•
When
normal
communication
is
restored,
the
count
number
becomes
O.
•
Station
numbers
of I/O
modules
are
remote
terminal
modules
are as
follows.
b15
to b8 b7 to bO
09141
Station
2
Station
1
09142
Station
4
Station
3
Station
6
Station
5
09141
D9171
Station
62 I
Station
81
to
Retry
Number
of
09172
Station
84
Station
83
09172
counter
retries
-
09174
•
The
retry
counter
for
one
station
consists
of 8
bits.
b(n + 7)
bjn
+ 6)
b(n
+ 5)
bIn
+ 4) bIn + 3) b(n + 2)
bIn
+ 1)
bIn
+ 0)
0/1
-,
-CO
Number
of
times
Number
of
times
1,
Error
•
"n" is
determined
by
the
station
number
of I/O
modules
and
remote
terminal
modules.
1,3,
5, 7...61, 63
odd
stations:
bO to b7 (n
~
0)
2,4,6,
8... 62, 64 even
stations:
b8 to
b15
(n
=8)
APP-17
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