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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
-,
- C O
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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