Emerson ControlWave Instruction Manual page 137

B.3.4 Output Registers (2 byte signed registers, transmitted upper byte first)
Revised Aug-2015
ControlWave I/O Expansion Rack Instruction Manual
range 121 to 136 would be 128, so your Modbus command should
request register 128.
AI value register
I/O Slot
1 (101-120)
2 (121-140)
3 (141-160)
4 (161-180)
5 (181-200)
6 (201-220)
7 (221-240)
8 (241-260)
9 (261-280)
10 (281-300)
11 (301-320)
12 (321-340)
13 (341-360)
14 (361-380)
Range: 501-660 (20 per board)
Example: To read AO register 7 on board 5, find AO value register in
the second column of the table, below, then move down that column
until you reach the board 5 row to determine the range of AO value
register numbers, for that board, in this case (581-588). The seventh
coil in the range 581 to 588 would be 587, so your Modbus command
should request register 587.
I/O Slot
1 (501-520)
2 (521-540)
3 (541-560)
4 (561-580)
5 (581-600)
6 (601-620)
7 (621-640)
8 (641-660)
9 (661-680)
Open Modbus Interface
AO clamped
value register
(1-16)
(1-8)
101-116 101-108
121-136 121-128
141-156 141-148
161-176 161-168
181-196 181-188
201-216 201-208
221-236 221-228
241-256 241-248
261-276 261-268
281-296 281-288
301-316 301-308
321-336 321-328
341-356 341-348
361-376 361-368
HSC lower 16 bits
(1-12)
101-112
121-132
141-152
161-172
181-192
201-212
221-232
241-252
261-272
281-292
301-312
321-332
341-352
361-372
AO value register (1-8)
501-508
521-528
541-548
561-568
581-588
601-608
621-628
641-648
661-668
B-5