Hardware First Notch Filter; Throughput In Normal Mode - Allen-Bradley 1794-IT8 User Manual

Writing Configuration to and Reading Status from your Module with a Remote I/O Adapter

Hardware First Notch Filter

A/D Filter First Notch
Frequency
(effective resolution)
Number of channels
scanned
1
2
3
4
5
6
7
8
1
Default setting
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

10Hz 25Hz 50Hz
(16-bits) (16-bits) (16-bits)
325 145 85
650 290 170
975 435 255
1.3s 580 340
1.625s 725 425
1.95s 870 510
2.275s 1.015s 595
1
2.60s 1.16s 680
60Hz 100Hz
(16-bits) (16-bits)
System Throughput (in ms and s)
75 55
150 110
225 165
300 220
375 275
450 330
525 385
600 440
4–3
250Hz 500Hz 1000Hz
(13-bits) (11-bits) (9-bits)
37 31 28
74 62 56
111 93 84
148 124 112
185 155 140
222 186 168
259 217 196
296 248 224
Publication 1794-6.5.7 – April 1997