JFR2
P. 5 / 8
EM-58
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DETECTING LEVEL
Determine the appropriate detecting level referring to the flow chart below.
A specific sensitivity scale is applied according to the pulse
amplitude setting. The scaled input voltage is then com-
pared to the detecting voltage level (0 – 5V).
The scaled H level voltage must be equal to or higher than
the detecting level so that the pulse state is accurately de-
tected. (Refer to the instruction manual for detailed infor-
mation about adjusting the detecting level.)
Table 1
SW
PULSE AMPLITUDE
SENSITIVITY SCALE
0
50 – 100V p-p
1/20
1
25 – 50V p-p
1/10
2
10 – 25V p-p
1/5
3
5 – 10V p-p
1/2
4
1 – 5V p-p
1
5
0.5 – 1V p-p
5
6
0.1 – 0.5V p-p
10
Open collector
7
Mechanical contact
1
Two-wire current pulse
START
Confirm the Sensitivity Scale in Table 1
below.
Assign the value in the following equation.
Detecting Level (V)
*
1
=
DC Offset (V)
*
2
×
Sensitivity Scale
Adjust the detecting level to the value
calculated above following the procedure
explained below.
Adjust the detecting level
appropriate for the sensor
excitation voltage.
Adjust the detecting level
to 0V appropriate for RS-
422 line driver pulse input.
Voltage pulse input or
2-wire current pulse input?
No
No
Yes
Open collector input?
Yes
*
1. Rounded off to one decimal place.
*
2. Divide a current input (mA) by 10 and
convert it into voltage (V).
Excitation
≥
10V DC
7 – 10V DC
5 – 7V DC
Detect. Level
2V
1.5V
1V
• Setting Examples
Voltage Input (DC Offset = Pulse Amplitude / 2)
PULSE
AMPLITUDE
DETECTING
AMPLITUDE (Vp-p)
RANGE (Vp-p)
LEVEL (V)
50
50 – 100
1.3
50
25 – 50
2.5
30
25 – 50
1.5
25
10 – 25
2.5
15
10 – 25
1.5
10
5 – 10
2.5
7.5
5 – 10
1.9
5
1 – 5
2.5
3.5
1 – 5
1.8
2
1 – 5
1
1
0.5 – 1
2.5
0.5
0.1 – 0.5
2.5
Current Input (DC Offset = Pulse Amplitude / 2)
PULSE
AMPLITUDE
DETECTING
AMPLITUDE (mAp-p)
RANGE
LEVEL (V)
15 (1.5Vp-p)
Set to open collector,
0.8
25 (2.5Vp-p)
mechanical contact or
1.3
two-wire current pulse
Set DC offset to 0V for 100Vp-p pulse input.
