Rockwell Automation Publication 2080-UM004C-EN-E - March 2015 35
High Speed Counter – 2080-MOT-HSC Appendix 4
User Defined Function
Blocks
RA_HSCPlugIn
The purpose of this UDFB is to get high speed counter accumulator value and
current pulse frequency.
1001 1000 999 Hz 1000 Hz 0.10%
9,999 10,000 100.01 Hz 100.00 Hz 0.010%
99,999 100,000 10.00010 Hz 10.00000 Hz 0.001%
(1) This table does not represent accuracy per pulse but repeatability. This repeatability can be applied in No
Filter setting.
Maximum Cyclic Rate Errors
Update Time
Value Scalar
Frequency
100 Hz 1 kHz 10 kHz 100 kHz 1 MHz
1 NA NA 20.02% 20.02% 0.210%
10 NA 20.11% 2.020% 0.210% 0.030%
100 20.01% 2.110% 0.220% 0.031% 0.012%
1000 3.010% 0.310% 0.040% 0.013% 0.010%
10,000 1.210% 0.130% 0.022% 0.011% 0.010%
For low frequency pulses, filter times should be set appropriately to
avoid extra pulses from a noisy environment. For high frequency pulses,
shielded cable must always be used.
Per Pulse Errors
(1)
Real pulses
(note 1.9999 can
be rounded to 2)
Pulses
reported by
module
Real
Frequency
Reported
Frequency
% Error
RA_HSCPlugIn
FBEN
SlotID
NoiseFilter
Mode
FBENO
IDCheck
Start
Stop
Initialized
Accumulator
Rate
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