Rockwell Automation 1794-IJ2XT FLEX I/O Frequency Input Modules User Manual User Manual
Page 35
Publication 1794-6.5.11 - September 2011
Install Your FLEX I/O Frequency Input Module 25
Resolution % is defined as:
Accuracy % is defined as:
% Resolution =
100
Count frequency x minimum frequency sample time
% Accuracy = 100
1 -
Minimum frequency sample time
2
Minimum
frequency sample
time
1
count frequency
+
Resolution and Accuracy
Accuracy
Minimum
Frequency
Sample
Time (ms)
Sampling
Accuracy
Time
Base
Accuracy
Worst
Case
Total
Accuracy
Deviation in Hz Due to
Total Accuracy
Resolution
1.0…3276.7
Frequency
Range
(in Hz)
1…32767
Frequency
Range
(in Hz)
2
0.02%
0.0225%
0.0425
0.1…1.4
1…14
0.01%
4
0.01%
0.0225%
0.0325
0.1…1.1
1…11
0.005%
5
0.008%
0.0225%
0.0305
0.1…1.0
1…10
0.004%
10
0.004%
0.0225%
0.0265
0.1…0.9
1…9
0.002%
20
0.002%
0.0225%
0.0245
0.1…0.8
1…8
0.001%
50
0.0008%
0.0225%
0.0233
0.1…0.8
1…8
0.0004%
100
0.0004%
0.0225%
0.0229
0.1…0.8
1…8
0.0002%
200
0.0002%
0.0225%
0.0227
0.1…0.7
1…7
0.0001%
500
0.00008%
0.0225%
0.02258
0.1…0.7
1…7
0.00004%
1000
0.00004%
0.0225%
0.02254
0.1…0.7
1…7
0.00002%
Input Map
Bit
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
Word
Read
0
Frequency 0…32,767 or 0.0…3,276.7 Channel 0
1
% Full Scale 0.0…3,276.7% Channel 0 or Acceleration -32,768…32,767 Channel 0
2
Frequency 0…32,767 or 0.0…3,276.7 Channel 1
3
% Full Scale 0.0…3,276.7% Channel 1 or Acceleration -32,768…32,767 Channel 1
4
R
R
Direction
Ch 0
GS
Ch 0
F/A
Ch 0
WO
Ch 0
MPA
Ch 0
R
R
Direction
Ch 1
GS
Ch 1
F/A
Ch 1
WO
Ch 1
MPA
Ch 1