Rockwell-automation 1771-IFE ANALOG INPUT MODULE Manual de usuario Pagina 36
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4–4 Configuring Your Module
-%#,#(' 0 *-*/
The module has hardware-based high frequency filters on all
channels to reduce the effect of electrical noise on the input signal.
Software digital filtering is meant to reduce the effect of process
noise on the input signal. Digital filtering is selected using BTW
word 3, bits 00-07.
The digital filter equation is a classic first order lag equation
(Figure 4.1). Using a step input change to illustrate the filter
response (Figure 4.2), you can see that when the digital filter
constant time elapses, 63.2% of the total response is reached. Each
additional time constant achieves 63.2% of the remaining response.
Figure 4.1
Digital Filter Equation
Y
n
= Y
n-1
+
t
t + TA
(X
n
- Y
n-1
)
Where:
')*+',(-,)-, #%,*)$.(%,!
')*.#(-+(-,)-, #%,*
,&(-%"''%-),,#&+('+
')*+',#')-,-' #%,*
#!#,% #%,* ,#& ('+,', +('+
Figure 4.2
Digital Filter Lag Equation Illustration
#& #' ('+
+
+
+
' #%,* ')-,
&)%#,-
Digital filter time constant values of 0.00 BCD to 0.99 BCD (0.00
BCD = no filter; 0.99 BCD = maximum filter) are set in bits 00
through 07 of word 3 of the block transfer write instruction. If an
invalid digital filter value is entered (i.e., 0.1F), bit 02, word 1 of the
block transfer read instruction will be set. If an invalid digital filter
value is entered, the module will not perform digital filtering. If you
use the digital filtering feature, the filter time constant value chosen
will apply to all input signals.
Digital Filtering
- 1
- 2
- 3
- Table of Contents 4
- Chapter 4 5
- Chapter 5 5
- Chapter 6 5
- Chapter 7 5
- 3"+)#!2).- 7 6
- Using This Manual 7
- Conventions 8
- Related Products 8
- Product Compatibility 9
- Related Publications 9
- Overview of the Analog 10
- Input Module 10
- How Analog Modules 11
- Communicate with 11
- Programmable Controllers 11
- Accuracy 12
- Chapter Summary 12
- 13
- Before You Install Your 14
- Electrostatic Damage 14
- Power Requirements 14
- Locating the Module in the 15
- I/O Chassis 15
- Setting the Configuration 15
- Plugs on the Module 15
- Setting the Series A/B 17
- Simulation Jumper 17
- Key the Backplane 18
- Connector 18
- Installing the Analog 19
- Wiring Your Analog 20
- < 22
- < 23
- Grounding 25
- Indicator Lights 26
- 27
- PLCĆ2 Programming 28
- PLCĆ3 Programming 29
- PLCĆ5 Programming 30
- Module Scan Time 31
- 33
- Input Range Selection 34
- Input Type 35
- Data Format 35
- Digital Filtering 36
- Real Time Sampling 37
- Scaling Ranges 38
- Default Configuration 40
- Write Configuration Block 41
- 42
- 43
- Block Transfer Read 44
- Calibrating Your Module 46
- Checking Module 47
- Calibration 47
- Calibrating your Input 48
- Gain Calibration 49
- 51
- &$(%$(" 53
- CheckingModule 54
- Operation 54
- 36+2 %8)59.-8 (81: 55
- Checking for Common 57
- Mode Voltages 57
- Troubleshooting a Bad 58
- 61
- Differences Between Series A 63
- Programming Examples 64
- PLCĆ3 Family Processor 65
- / 66
- PLCĆ5 Family Processors 67
- Data Table Formats 68
- SignedĆmagnitude Binary 69
- Two's Complement Binary 70
- PLCĆ2/20 Processors) 71
- Setting the Block Length 73
- (Multiple GET Instructions 73
- 74
- Analog Block Transfer Read 75
- Analog Block Transfer Write 76
- IndexI–2 78
- AllenĆBradley 79
- Publication Problem Report 79
- BUSINESS REPLY MAIL 80
- Support Services 81
- (8;5.@3./ ;/9;/</7=+=387 82
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