Rockwell Automation 1746-NI16V SLC 500 Analog Input Modules User Manual User Manual
Page 43
Publication 1746-UM001A-US-P
Preliminary Operating Considerations 4-7
The 1746-NI16 module sequentially samples the channels in a
continuous loop according to the following diagram. The next
channel in the order is sampled if any channel is disabled.
The following table shows the module update time. The module
update time is different depending on the number of channels
enabled and filter frequency. The fastest module update time occurs
when only one channel is enabled on each A/D chip (channels 0, 4, 8,
and 12). The slowest module update time occurs when 16 channels
are enabled.
.
Channel Sample Order
Channel 0
Channel 4
Channel 8
Channel 9
Channel 1
Channel 6
Channel 2
Channel 13
Channel 12
Channel 5
Channel 10
Channel 7
Channel 3
Channel 14
Channel 11
Channel 15
Filter Frequency
(Hz)
Update Time
16-Ch (ms)
(1)
(1)
Assuming all of the enabled channels have the filter frequency shown in the first column.
Update Time
12-Ch (ms)
Update Time
8-Ch (ms)
Update Time
4-Ch (ms)
6
630
473
314
7
10
380
285
190
4
20
194
145
96
4
40
100
75
50
4
60
69
52
34
4
80
54
39
26
4
100
37
27
18
4
250
18
13
9
4