Mitsubishi Electric MELSEC Q Series User Manual page 90

(1) Buffer memory areas for error occurrence data
Pointer No.
Pointer No.
Md.12
Error code
Md.13
Error occurrence
(Year: Month)
Md.14
Error occurrence
(Day: Hour)
Md.15
Error occurrence
(Minute: Second)
Item
88
Md.16
Error history pointer
5
4
3
2
1
0
132
128
124
120
133
129
125
121
134
130
126
122
135
131
127
123
A set of buffer memory data is organized as an error history record
with a pointer number.
Ex.
Buffer memory
address
Error history records are stored from the pointer No.1 up to No.15.
After 16 records are stored, the next record will be assigned the pointer No.0.
(The new record replaces the older record.)
184
Stores the pointer number that is next to the one for
the latest error history record.
11
10
9
8
7
6
156
152
148
144
140
136
157
153
149
145
141
137
158
154
150
146
142
138
159
155
151
147
143
139
Pointer No.0 = Buffer memory addresses 120 to 123
Pointer No.1 = Buffer memory addresses 124 to 127
Pointer No.2 = Buffer memory addresses 128 to 131
Pointer No.15 = Buffer memory addresses 180 to 183
15
14
13
12
180
176
172
168
164
160
181
177
173
169
165
161
182
178
174
170
166
162
183
179
175
171
167
163