Hardware first notch filter – Rockwell Automation 1794-IT8,D17946.5.7 Thermocouple/Millivolt Input Module User Manual
Page 29

4–3
Writing Configuration to and Reading Status from your Module with a Remote I/O Adapter
Publication 1794-6.5.7 – April 1997
You select input scaling using the designated words of the write
block transfer instruction. Refer to the Bit/Word description for write
word 0, bits 00 and 01.
A hardware filter in the analog to digital converter lets you select a
frequency for the first notch of the filter. Selection of the filter
influences the analog to digital output data rate and changes the
module throughput. Module throughput is a function of the number
of inputs used and the first notch filter. Both of these influence the
time from a thermocouple input to arrival at the backplane.
Throughput in Normal Mode
A/D Filter First Notch
Frequency
(effective resolution)
10Hz
(16-bits)
25Hz
(16-bits)
50Hz
(16-bits)
60Hz
(16-bits)
100Hz
(16-bits)
250Hz
(13-bits)
500Hz
(11-bits)
1000Hz
(9-bits)
Number of channels
scanned
System Throughput (in ms and s)
1
325
145
85
75
55
37
31
28
2
650
290
170
150
110
74
62
56
3
975
435
255
225
165
111
93
84
4
1.3s
580
340
300
220
148
124
112
5
1.625s
725
425
375
275
185
155
140
6
1.95s
870
510
450
330
222
186
168
7
2.275s
1.015s
595
525
385
259
217
196
8
2.60s
1
1.16s
680
600
440
296
248
224
1
Default setting
Hardware First Notch Filter
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