■
DETECTING LEVEL (voltage pulse and two-wire current pulse)
Determine the appropriate detecting level referring to the flow chart below.
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.
Confirm open collector or
mechanical contact input.
Adjust the detecting level to
2.0V.
Voltage or two-wire current
pulse input?
No
Yes
*
1. Divide a two-wire current pulse input (mA) by 10 and convert it into voltage (V).
*
2. Rounded off to one decimal place.
Table 1
SW
PULSE AMPLITUDE
SENSITIVITY SCALE
0
1
2
3
50 – 100V p-p
25 – 50V p-p
10 – 25V p-p
5 – 10V p-p
1/20
1/10
1/5
1/2
4
5
6
1 – 5V p-p
0.5 – 1V p-p
0.1 – 0.5V p-p
1
5
10
7
Open collector
Mechanical contact
Two-wire current pulse
1
A specific sensitivity scale is applied according to the pulse
amplitude setting. The scaled input voltage is then com-
pared to the preset detecting level.
With DC coupling, the scaled H level voltage must be higher
than the detecting level so that the pulse state is accurately
detected.
• Setting Examples
Voltage Pulse (DC Offset = Pulse Amplitude / 2)
PULSE AMPLITUDE
(Vp-p)
AMPLITUDE
RANGE (Vp-p)
DETECTING
LEVEL (V)
50
50
30
50 – 100
25 – 50
25 – 50
1.3
2.5
1.5
25
15
10
10 – 25
10 – 25
5 – 10
2.5
1.5
2.5
7.5
5
3.5
5 – 10
1 – 5
1 – 5
1.9
2.5
1.8
2
1
0.5
1 – 5
0.5 – 1
0.1 – 0.5
1
2.5
2.5
Two-wire Current Pulse (DC Offset = Pulse Amplitude / 2)
PULSE AMPLITUDE
(mAp-p)
AMPLITUDE
RANGE
DETECTING
LEVEL (V)
15 (1.5Vp-p)
25 (2.5Vp-p)
Set to open collector,
mechanical contact or
two-wire current pulse
0.8
1.3
Set DC offset to 0V for 100Vp-p pulse input.
JPQ2
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Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-1579 Rev.3 P. 5 / 8