Mitsubishi Electric MELCEC Q Series User Manual page 235

APPENDICES
Number Name
D9141
D9142
D9143
D9144
D9145
D9146
D9147
D9148
D9149
D9150
D9151
D9152
D9153
D9154
D9155
Number of
D9156
times of retry
D9157
execution
D9158
D9159
D9160
D9161
D9162
D9163
D9164
D9165
D9166
D9167
D9168
D9169
D9170
D9171
D9172
Table App.2.2 Special Register List (continued)
Description
• Stores the number of retries executed to I/O modules
or remote terminal modules which caused
communication error.
(Retry processing is executed the number of times set
at D9174.)
• Data becomes 0 when communication is restored to
normal.
• Station number setting of I/O modules and remote
terminal modules is as shown below.
Number of retries
• Retry counter uses 8 bits for one station.
b(n+7)
0/1
* "n" is determined by station number of I/O module or
remote terminal module.
Odd number stations: b0 to b7 (n = 0)
Even number stations: b8 to b15 (n = 8)
Details
b15 to b8 b7
D9141 Station 2
D9142 Station 4
D9143 Station 6
D9171 Station 62 Station 61
D9172 Station 64 Station 63
b(n+6) b(n+5) b(n+4) b(n+3) b(n+2) b(n+1) b(n+0)
Number of retries
0: Normal
1: Station error
App - 41
Applicable CPU
to b0
Station 1
Station 3
Station 5
Usable with
—
A2C and A52G.