Dual voltage inputs (24v or 5v), Dual voltage inputs (24v or 5v) -7 – Rockwell Automation System Design for the Control of Electrical Noise User Manual
Page 83

Publication GMC-RM001A-EN-P — July 2001
High Speed Registration Inputs
9-7
Dual Voltage Inputs (24V or 5V)
Where the input is split into 5V and 24V, with inputs sharing the same
common, it is important that the 5V input is not left floating. In the
figure below, the 24V and 5V inputs are shorted together and fed at
5V.
Figure 9.5
Registration filter circuit (24V/5V)
The on-delay and off-delay times are shown in the table below.
R1
R2
C
+5V
+24V
+24V
Common
Common
To Registration Inputs
From Detector
R1
k ohm
R2
k ohm
C
nF
Delay
On
µ
s
Delay
Off
µ
s
Noise
Attenuation
factor
@ 1MHz
Noise
Attenuation
@1MHz
dB
0.100
0.390
220
22
2
14
23
0.100
0.390
220
22
5
30
29
0.100
0.390
220
22
10
65
36
0.100
0.390
220
22
22
139
43
0.100
0.390
470
47
47
295
49
0.100
0.390
1000
100
100
649
56
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