·Some details are not shown. Please refer to specification sheets for all information.


Plug-in Signal Conditioners M-UNIT

(field-programmable; built-in excitation)

Functions & Features
• Converts pulse rate into convenient engineering unit for display on a totalizing counter or meter
• Various outputs
• Sensor excitation
• Scaling factor is user-programmable by simply setting input and output frequencies via handheld programmer PU-2x
• Isolation up to 2000 V AC
Typical Applications
• Positive displacement flowmeters or turbine flowmeters
• Converts dry contact pulse signals from a rotating machine into an engineering unit

MODEL: JPR2–[1][2][3][4]–[5][6]

• Code number: JPR2-[1][2][3][4]-[5][6]
Specify a code from below for each of [1] through [6].
  (e.g. JPR2-4P1N-K/Q)
• Use Ordering Information Sheet (No. ESU-1580). Default setting (table below) will be used if not otherwise specified.
• Specify the specification for option code /Q
  (e.g. /C01/S01)

INPUT – Field-selectable
Open collector
Mechanical contact
Voltage pulse
Two-wire current pulse
RS-422 line driver pulse

1: 5 V DC @ 120 mA
4: 12 V DC @ 60 mA
7: 24 V DC @ 25 mA

A: Open collector (max. 100 kHz)
M: 5 V pulse (max. 100 kHz)
N: 12 V pulse (max. 100 kHz)
P: 24 V pulse  (max. 100 kHz)
J: RS-422 line driver pulse (max. 100 kHz)
R: Noncontact AC/DC switch (max. 20 Hz)
( ) = Max. frequency

1: No conversion to one-shot
3: One-shot output (std. pulse width 50 msec.)
(Specify when optional pulse width is required.)

N: The same as the input
R: Inverted

AC Power
K: 85 – 132 V AC
DC Power
S: 12 V DC
R: 24 V DC
V: 48 V DC
P: 110 V DC

blank: none
/Q: With options (specify the specification)

SPECIFICATIONS OF OPTION: Q (multiple selections)
COATING (For the detail, refer to M-System's web site.)
/C01: Silicone coating
/C02: Polyurethane coating
/C03: Rubber coating
/S01: Stainless steel

1) The JPR2 is not designed to output uniform pulses even when the input wave is uniform. It is not applicable to certain types of application.
2) The JPR2 converts the pulse counts, not frequency. For the frequency conversion purpose, model JFR2 is recommended.

• Programming Unit (model: PU-2x)
• PC configurator software (model: JXCON)
Downloadable at M-System’s web site.
A dedicated cable is required to connect the module to the PC.  Please refer to the internet software download site or the users manual for the PC configurator for applicable cable types.

Construction: Plug-in
Connection: M3.5 screw terminals
Screw terminal: Chromated steel (standard) or stainless steel
Housing material: Flame-resistant resin (black)
Isolation: Input or sensor exc. to output to power
Input monitor LED: Red LED blinks according to the input.
Excitation adjustment: 5 – 24 V DC
Software programming: Programming Unit (model: PU-2x);
(Refer to the users manual of JXCON for the adjustments configurable with JXCON)
• Input and output pulse set count (frequency)
• Sampling time
• Input pulse edge
• Max. frequency limit
• Others
Adjustments: With DIP and Rotary switches.
• Pulse amplitude
• Input type
• Noise filter
(Refer to the instruction manual for details)
Sampling time: 0.01 – 100 sec.
Buffer counter capacity: 4 294 967 295 counts
Input pulse sensing: DC coupled

Excitation: Shortcircuit protection; approx. 440 mA (max.) at shortcircuit
Max. frequency: 100 kHz
(10 Hz for mechanical contact input)
Minimum pulse width time requirement: 5 μsec.; 50 msec. for mechanical contact (for both ON and OFF)
Open Collector & Mechanical Contact
Input requirements
(Excitation: Sensing)
5 V: Approx. 4 V / 1.0 mA
12 V: Approx. 9 V / 2.3 mA
24 V: Approx. 16 V / 4.7 mA
Resistance at ON : ≤ 200 Ω
Resistance at OFF : ≥ 200 kΩ
Detecting level: 1 V with 5 V excitation
2 V with 12 V/24 V excitation.
(Detecting voltage in the internal circuit)
For open collector or mechanical contact input, be sure to re-adjust the voltage back to 1 V (excitation 5 V) or 2 V (excitation 12 V/24 V) if it has been changed for other input types.
Detecting pulse edge: OFF (input monitor LED ON) to ON (input monitor LED OFF) or ON to OFF
Voltage Pulse
: Square or sine
Input impedance: ≥ 10 kΩ
Pulse amplitude: 0.1 – 100 Vp-p (square)
1 – 100 Vp-p (sine or similar)
Max. voltage between input terminals: 50 V
Detecting level: 0 – 5 V (Detecting voltage in the internal circuit.)
Detecting pulse state: A pulse rise detected when the input voltage goes above the detecting level (input monitor LED ON); a pulse sink detected when it goes below the level (input monitor LED OFF).
Two-wire Current Pulse
Input resistance
: Receiving resistor 100 Ω
Input range: 0 – 25 mA
Minimum pulse amplitude: 10 mA
Detecting level: 0 – 5 V
(Detecting voltage in the internal circuit.)
Detecting pulse state: The input resistor (100 Ω) converts the current signal (0 - 25 mA) into 0 – 2.5 V. A pulse rise detected when the voltage goes above the detecting level (input monitor LED ON); a pulse sink detected when it goes below the level (input monitor LED OFF).
RS-422 Line Driver Pulse
Receiver: Conforms to RS-422

Output pulse: No. of input pulse × scaling factor (scaling factor = output pulse set count / input pulse set count)
Scalable range: 1/1 000 000 to 1 000 000
■ Open Collector: 50 V DC @ 50 mA (resistive load)
Saturation voltage: 0.6 V DC
Maximum frequency: 100 kHz
Voltage Pulse
H level
: Rating (5, 12 or 24 V) ±10 %
L level: ≤ 0.5 V
Load resistance: ≥ 1 kΩ (5 V), ≥ 2.4 kΩ (12 V),
≥ 4.8 kΩ (24 V)
Maximum frequency: 100 kHz
Noncontact AC/DC Switch: 120 V AC or 120 V DC @200 mA (resistive load)
ON resistance: 3 Ω
Maximum frequency: 20 Hz
Rise time: 5 msec.
Sink time: 3 msec.
RS-422 Line Driver Pulse
: Conforms to RS-422
Maximum frequency: 100 kHz

No conversion to one-shot: Duty ratio approx. 50 %; Internal digital computation calculates the pulse width.
One-shot Output: Preset pulse width ±20 %
Optional pulse width: 30 μsec. – 300 msec.

Power input
AC: Operational voltage range 85 – 132 V,
47 – 66 Hz, approx. 6 VA
DC: Operational voltage range: Rating ±10 %, or 85 – 150 V for 110 V rating; ripple 10 %p-p max.; Approx. 3.3 W (140 mA at 24 V)
Operating temperature: -5 to +60°C (23 to 140°F)
Operating humidity: 30 to 90 %RH (non-condensing)
Mounting: Surface or DIN rail
Weight: 400 g (0.88 lb)

Response time: Sampling time + 50 msec.
The response time equals the interval between the first input pulse and the first output pulse.
Insulation resistance: ≥ 100 MΩ with 500 V DC
Dielectric strength: 2000 V AC @ 1 minute (input or sensor excitation to output to power to ground)


Refer to the instruction manual for detailed procedures.




Input frequency
: 2 Hz
Sampling time: 0.5 sec.
Pulse rate: 3/2
Output pulse width: Duty ratio approx. 50 %
Max. output frequency: 1 kHz

1) The JPR2 counts the number of pulses during the sampling time (period). In the example, 1 count in 0.5 sec. time.
2) Converts the number in the preset rate. In the example, 1 pulse × 3/2 = 1.5 pulses
3) Outputs the converted pulses in the next sampling period.
If certain pulses are not output within the time frame due to a fraction or the max. output frequency limit, they are output in the following sampling period. In the example, 1 pulse is output in the second period, two pulses are output in the third to adjust the fraction.

M-System Co., Ltd.