Mitsubishi Electric MELSEC-A Series User Manual page 191

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