Rockwell Automation 1771-CFM,D17716.5.99 CONFIGURABLE FLOWMET - Manual (Page 59)

Appendix
A
Publication 1771Ć6.5.99 - December 1995
Specifications
This appendix contains the frequency accuracy and general
specifications of the CFM module.
The following table lists typical application configurations and their
associated frequency accuracy for the CFM module when used:
•
to emulate a 1771-QRC or 1771-QRD module
•
as a CFM module
Important: The accuracy in all configurations will vary with
input frequency, mode of operation and frequency
sample time.
QRC / QRD module emulation
CFM module
Frequency Frequency range
Maximum frequency error (Hz or %)
CFM module
configured for
Frequency
sampling time
Frequency range
(0Ć120,000Hz) 25 ° C 40 ° C 60 ° C
QRC operation constant @ 12ms
0 -
6,001 -
14,001 -
6,000
14,000
15,800
± 1Hz ➀
± 1Hz ➀
± 1Hz ➀
± 1Hz ➀
± 1Hz ➀
± 0.007%
± 1Hz ➀
± 0.015%
± 0.015%
QRD operation constant @ 1s
0 -
6,001 -
6,000
10,000
± 1Hz ➀
± 0.080%
± 1Hz ➀
± 0.090%
± 1Hz ➀
± 0.10%
CFM module
Totalizer &
100ms
0 -
11 -
2,001 -
18,001 Ć
10
2,000
18,000
120,000
± 1Hz ➀
± 10Hz
± 0.180%
± 0.100%
± 1Hz ➀
± 10Hz
± 0.180%
± 0.120%
± 1Hz ➀
± 10Hz
± 0.20%
± 0.150%
Totalizer &
Nonresettable Totalizer ➁
Mode 500ms
0 -
51 -
8,001 -
20,001 -
50
8,000
20,000
120,000
± 1Hz ➀
± 2Hz
± 0.03%
± 0.025%
± 1Hz ➀
± 2Hz
± 0.03%
± 0.0275%
± 1Hz ➀
± 3Hz
± 0.035%
± 0.03%
1000ms
0 -
6,001 -
6,000
120,000
± 1Hz ➀
± 0.020%
± 1Hz ➀
± 0.025%
± 1Hz ➀
± 0.030%
4ms
0 -
6,001 -
14,001 -
6,000
14,000
120,000
± 1Hz ➀
± 1Hz ➀
± 0.0150%
± 1Hz ➀
± 1Hz ➀
± 0.020%
± 1Hz ➀
± 0.020%
± 0.025%
HighĆresolution
Frequency
10ms
0 -
6,001 -
14,001 -
20,001 -
6,000
14,000
20,000
120,000
± 1Hz ➀
± 1Hz ➀
± 1Hz ➀
± 0.007%
± 1Hz ➀
± 1Hz ➀
± 0.007%
± 0.007%
± 1Hz ➀
± 0.015%
± 0.015%
± 0.015%
Frequency
(time only)
Mode 100ms
0 -
6,001 -
14,001 -
20,001 -
6,000
14,000
20,000
120,000
± 1Hz ➀
± 1Hz ➀
± 1Hz ➀
± 0.005%
± 1Hz ➀
± 1Hz ➀
± 0.007%
± 0.007%
± 1Hz ➀
± 0.015%
± 0.015%
± 0.015%
1000ms
0 -
6,001 -
14,001 -
20,001 -
6,000
14,000
20,000
120,000
± 1Hz ➀
± 1Hz ➀
± 1Hz ➀
± 0.005%
± 1Hz ➀
± 1Hz ➀
± 0.007%
± 0.007%
± 1Hz ➀
± 0.015%
± 0.015%
± 0.015%
Direction Sensor Mode not applicable
0 -
2,001 -
30,001 -
2,000
30,000
120,000
± 1Hz ➀
± 0.550%
± 2.500%
± 1Hz ➀
± 0.550%
± 2.500%
± 1Hz ➀
± 0.550%
± 2.500%
➀ Specified 1Hz is worst case Ċ typical performance is expected to be better than ± 1Hz.
➁ In Totalizer and Nonresettable Totalizer modes, frequencies input slightly above 1/Minimum Frequency Sampling Time may result in an inaccurate frequency (approximately
twice the actual frequency) because the incoming pulses and sample time are not synchronized.
What This Appendix
Contains
Frequency Accuracy