Magnitude data – Rockwell Automation 1426 PowerMonitor 5000 Unit User Manual
Page 380
380
Rockwell Automation Publication 1426-UM001F-EN-P - November 2013
Appendix D
PowerMonitor 5000 Waveform Capture and Compression (M6 model)
Where X(h) is the value (magnitude or angle) of the harmonic at order h.
Magnitude Data
Bytes 0…63 contain 32-bit encoded magnitudes V(h) and I(h) for h = DC thru
15. Byte 64 contains the exponent offset for use in the 12-bit encoded data that
follows. The remaining bytes hold the remaining harmonic magnitude values
in12-bit encoding.
Table 198 - 12-bit Encoding
Byte offset 0
Byte offset 1
Byte offset 3
Low 8 bits of X(h)
High 4 bits of X(h)
Low 4 bits of X(h+1)
High eight bits of
X(h+1)
Byte offset
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Data Info
DC
1st Harmonics RMS
2nd
3rd
Byte offset
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Data Info
4th
5th
6th
7th
Byte offset
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
Data Info
8th
9th
10th
11th
Byte offset
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
Data Info
12th
13th
14th
15th
Byte offset
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
Data Info
Exp
16th & 17th
18th & 19th
20th & 21st
22nd & 23rd
24th & 25th
Byte offset
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
Data Info
26th & 27th
28th & 29th
30th & 31st
32nd & 33rd
34th & 35th
36th
Byte offset
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
Data Info
& 37th
38th & 39th
40th & 41st
42nd & 43rd
44th & 45th
46th &
Byte offset
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
Data Info
47th
48th & 49th
50th & 51st
52nd & 53rd
54th & 55th
56th & 57th
Byte offset
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
Data Info
58th & 59th
60th & 61st
62nd & 63rd
64th & 65th
66th & 67th
68th
Byte offset
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
Data Info
& 69th
70th & 71st
72nd & 73rd
74th & 75th
76th & 77th
78th &
Byte offset
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
Data Info
79th
80th & 81st
82nd & 83rd
84th & 85th
86th & 87th
88th & 89th
Byte offset
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
Data Info
90th & 91st
92nd & 93rd
94th & 95th
96th & 97th
98th & 99th
100th
Byte offset
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
Data Info
& 101st
102nd & 103rd
104th & 105th
106th & 107th
108th & 109th
110th &
Byte offset
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
Data Info
111th
112th & 113th
114th & 115th
116th & 117th
118th & 119th
120th & 121st
Byte offset
224
225
226
227
228
229
230
231
232
Data Info
122nd & 123rd
124th & 125th
126th & 127th