Omron K3NP DATASHEET

Period Meter

K3NP

An Ideal Interface for Easily Measuring the
Time Interval

• 50-kHz input range and 0.08% accuracy for sophisticated
control.

• A wide selection of outputs: relay, transistor, BCD, linear, or
communications.

• Maximum/Minimum value hold, set value write protection, and
more.

• Banks with four comparative output values and four prescale
values.

• Set value teaching, linear output range teaching, and prescale
teaching are available using actual measured values.

• Prescale function available, which displays in units of actual
physical parameters (length, volume, etc.).

• Displays values in hours, minutes, and seconds in operating
modes 2 to 4.

• Built-in sensor power supply (12 VDC, 80 mA).

• Compact 1/8 DIN size.

• Conforms to EMC standards, EN61010-1 (IEC1010-1).

• UL/CSA approved.

Timers

®

Model Number Structure

■ Model Number Legend

Base Units and Output Boards can be ordered individually or as sets. Refer to the Output Board Combinations table on page 194.

Base Units

K3NP -

1234

1, 2. Input Sensors Codes

NB: NPN inputs/Voltage pulse inputs
PB: PNP inputs

3. Supply Voltage

1: 100 to 240 VAC
2: 12 to 24 VDC

4. Display

A: Basic
C: Set Value LED Display

5, 6, 7, 8. Output Type Codes

C1: 3 comparative relay contact outputs (H, PASS, L: SPDT)
C2: 5 comparative relay contact outputs (HH, H, L, LL: SPST-

NO; PASS: SPDT)

C5: 5 comparative relay contact outputs (HH, H, L, LL: SPST-

NC; PASS: SPDT)
T1: 5 comparative transistor outputs (NPN open collector)
T2: 5 comparative transistor outputs (PNP open collector)
B2: BCD output (NPN open collector) (see note)
B4: BCD output + 5 transistor outputs (NPN open collector)
L1: Linear output (4 to 20 mA) (see note)

Note: These output types are available on Basic Models only.

Output Boards

K31 -

5 678

Base Units with Output Boards

K3NP - -

2345678

1

L2: Linear output (1 to 5 VDC) (see note)
L3: Linear output (1 mV/10 digits) (see note)
L4: Linear output, 4 to 20 mA + 5 transistor outputs (NPN open

collector)

L5: Linear output, 1 to 5 V + 5 transistor outputs (NPN open col-

lector)

L6: Linear output, 1 mV/10 digits+ 5 transistor outputs (NPN

open collector)
L7: Linear output, 0 to 5 VDC (see note)
L8: Linear output, 0 to 10 VDC (see note)
L9: Linear output, 0 to 5 VDC + 5 transistor outputs (NPN open

collector)
L10: Linear output, 0 to 10 VDC + 5 transistor outputs (NPN open

collector)
FLK1: Communication RS-232C (see note)
FLK2: Communication RS-485 (see note)
FLK3: Communication RS-422 (see note)
FLK4: RS-232C + 5 transistor outputs (NPN open collector)
FLK5: RS-485 + 5 transistor outputs (NPN open collector)
FLK6: RS-422 + 5 transistor outputs (NPN open collector)

Period Meter K3NP B-193

Ordering Information

■ Base Unit

Input type NPN/Voltage pulse PNP

Supply voltage 100 to 240 VAC 12 to 24 VDC 100 to 240 VAC 12 to 24 VDC

Basic Models

These models provide a
present value LED and
front-panel control keys. Can
be connected to any Output
Board, or can be used for
display only without an
Output Board.

Set Value LED Models

These models provide a
present value LED, set value
LED, and front-panel control
keys. Can be connected to
Relay, Transistor, or
Combination Output Boards.

■ Available Output Board Combinations

Output type Output configuration Output boards Base units

Relay contact 3 outputs: H, PASS, L (SPDT) K31-C1 Yes Yes

5 outputs: HH, H, L, LL (SPST-NO), and PASS (SPDT) K31-C2 Yes Yes
5 outputs: HH, H, L, LL (SPST-NC), and PASS (SPDT) K31-C5 Yes Yes

Transistor 5 outputs (NPN open collector) K31-T1 Yes Yes

5 outputs (PNP open collector) K31-T2 Yes Yes

BCD (see note) 5-digit output (NPN open collector) K31-B2 Yes ---
Linear 4 to 20 mA DC K31-L1 Yes ---

1 to 5 VDC K31-L2 Yes --­1 mV/10 digits K31-L3 Yes --­0 to 5 VDC K31-L7 Yes --­0 to 10 VDC K31-L8 Yes ---

Communication boards
(see note)

Combination output and
communication boards

RS-232C K31-FLK1 Yes --­RS-485 K31-FLK2 Yes --­RS-422 K31-FLK3 Yes --­BCD output + 5 transistor outputs (NPN open collector) K31-B4 Yes Yes
4 to 20 mA + 5 transistor outputs (NPN open collector) K31-L4 Yes Yes
1 to 5 V + 5 transistor outputs (NPN open collector) K31-L5 Yes Yes
1 mV/10 digits + 5 transistor outputs (NPN open collector) K31-L6 Yes Yes
0 to 5 VDC + 5 transistor outputs (NPN open collector) K31-L9 Yes Yes
0 to 10 VDC + 5 transistor outputs (NPN open collector) K31-L10 Yes Yes
RS-232C + 5 transistor outputs (NPN open collector) K31-FLK4 Yes Yes
RS-485 + 5 transistor outputs (NPN open collector) K31-FLK5 Yes Yes
RS-422 + 5 transistor outputs (NPN open collector) K31-FLK6 Yes Yes

K3NP-NB1A K3NP-NB2A K3NP-PB1A K3NP-PB2A

K3NP-NB1C K3NP-NB2C K3NP-PB1C K3NP-PB2C

Basic Set Value

LED Display

Note: For details, refer to the Communication Operation Manual.

B-194 Period Meter K3NP

Specifications

■ Ratings

Supply voltage 100 to 240 VAC (50/60 Hz); 12 to 24 VDC
Operating voltage range 85% to 110% of supply voltage
Power consumption (see note) 15 VA max. (max. AC load with all indicators lit)

Sensor power supply 80 mA at 12 VDC±10%
Insulation resistance 20 MΩ min. (at 500 VDC) between external terminal and case.

Dielectric strength 2,000 VAC for 1 min between external terminal and case.

Noise immunity ±1,500 V on power supply terminals in normal or common mode ±1 µs, 100 ns for square-wave noise

Vibration resistance Malfunction: 10 to 55 Hz, 0.5-mm for 10 min each in X, Y, and Z directions

Shock resistance

Ambient temperature Operating: −10°C to 55°C (with no icing)

Ambient humidity Operating: 25% to 85% (with no condensation)
EMC (EMI) EN61326+A1 Industry

Approved standards UL508, CSA22.2;

Weight Approx. 400 g

Note: A K3NP with DC supply voltage requires approximately 1 A DC as control power supply current the moment the K3NP is turned ON. Do not

forget to take this into consideration when using several K3NP units. When the K3NP is not in measuring operation (e.g., the K3NP has been
just turned ON or is operating for startup compensation time), the display will read “00000” and all outputs will be OFF.

10 W max. (max. DC load with all indicators lit)

Insulation provided between inputs, outputs, and power supply.

Insulation provided between inputs, outputs, and power supply.

with 1 ns

Destruction: 10 to 55 Hz, 0.75-mm for 2 hrs each in X, Y, and Z directions

2

Malfunction: 98 m/s
Destruction: 294 m/s

Storage: −20°C to 65°C (with no icing)

Emission Enclosure: CISPR 11 Group 1 class A: CISRP16-1/-2
Emission AC Mains: CISPR 11 Group 1 class A: CISRP16-1/-2
(EMS) EN61326+A1 Industry
Immunity ESD: EN61000-4-2: 4 kV contact discharge (level 2)

Immunity RF-interference: EN61000-4-3: 10 V/m (amplitude-modulated,

Immunity Fast Transient Noise: EN61000-4-4: 2 kV (power line) (level 3)
Immunity Burst Noise: 1 kV line to line (I/O signal line)
Immunity Surge: EN61000-4-5: 1 kV line to line

Immunity Conducted Disturbance EN61000-4-6: 3 V (0.15 to 80 MHz) (level 2)
Immunity Voltage Dip/Interrupting EN61000-4-11: 0.5 cycles, 0, 180°, 100% (rated voltage)

Conforms to EN61326+A1, EN61010-1 (IEC61010-1)
Conforms to VDE0106/P100 (finger protection) when the terminal cover is mounted.

(10G) for 3 times each in X, Y, and Z directions

2

(30G) for 3 times each in X, Y, and Z directions

8 kV air discharge (level 3)

80 MHz to 1 GHz) (level 3)

2 kV line to ground (power line)

Timers

Period Meter K3NP B-195

■ Characteristics

Input signal No-voltage contact (30 Hz max., ON/OFF pulse width: 15 ms min.)

Measuring accuracy
(at 23±5°C)

Measuring modes and
ranges

Max. displayed digits 5 digits (0 to 99999)
Display 7-segment LED
Polarity display Not available
Zero display Leading zeros are not displayed.
Prescale function

HOLD functions Max. value (peak) hold, Min. value (bottom) hold
External control HOLD (Process value held)

Other functions Variable linear output range (for models with linear outputs only) (see note)

Output configuration Relay contact output (3 or 5 outputs)

Delay in comparative
outputs (at transistor output)

Linear output response time 40 ms max.
Degree of protection Front panel: NEMA4 for indoor use (equivalent to IP66)

Memory protection Non-volatile memory (EEPROM) (possible to rewrite 100,000 times)

Note: The linear output range cannot be set when connected to a 1 mV/10-digit Linear Output Board.

Voltage pulse (50 kHz max., ON/OFF pulse width: 9 µs min., ON voltage: 4.5 to 30 V/OFF voltage: −30 to 2 V)
Open collector (50 kHz max., ON/OFF pulse width: 9 µs min.)

Connectable Sensors

ON residual voltage: 3 V max.
OFF leakage current: 1.5 mA max.
Load current: Must have switching capacity of 20 mA min.

±0.08%rdg±1 digit

Operating mode 1: Passing speed 10 ms to 3,200 seconds
Operating mode 2: Cycle 20 ms to 3,200 seconds
Operating mode 3: Time difference 10 ms to 3,200 seconds
Operating mode 4: Elapsed time 10 ms to 3,200 seconds
Operating mode 5: Length measurement 0 to 4G count (32-bit counter)
Operating mode 6: Interval 0 to 4G count (32-bit counter)

Programming via front-panel key inputs. (0.0001 x 10
Can be set using prescale value teaching.

RESET (Maximum/minimum data reset)
BANK (Selection of one bank out of 4 banks of set values)

(Selection of one bank out of 4 banks of prescale values)

Remote/Local processing (available for communications output models only)
Maximum/Minimum value data reset with front panel keys
Comparative output pattern selection
Time unit display
Security

Transistor output (NPN and PNP open collector), BCD (NPN open collector)
Parallel BCD (NPN open collector) + transistor output (NPN open collector)
Linear output (4 to 20 mA, 1 to 5 V) + transistor output (NPN open collector)
Communication functions (RS-232C, RS-485, RS-422)
Communication functions (RS-232C, RS-485, RS-422) + transistor output (NPN open collector)

20 ms max.

Rear case: IEC standard IP20
Terminals: IEC standard IP00

Must be able to dependably switch a load current of 5 mA max.

−9

to 9.9999 x 109, decimal point can be set freely)

B-196 Period Meter K3NP

■ Input/Output Ratings

Relay Contact Output

(Incorporating a G6B Relay)

Item Resistive load (cosφ = 1) Inductive load (cosφ = 0.4, L/R = 7 ms)
Rated load 5 A at 250 VAC; 5 A at 30 VDC 1.5 A at 250 VAC, 1.5 A at 30 VDC
Rated carry current 5 A max. (at COM terminal)
Max. contact voltage 380 VAC, 125 VDC
Max. contact current 5 A max. (at COM terminal)
Max. switching capacity 1,250 VA, 150 W 375 VA, 80 W
Min. permissible load

(P level, reference value)
Mechanical life 50,000,000 times min. (at a switching frequency of 18,000 times/hr)
Electrical life

(at an ambient temperature of 23°C)

Transistor Output

Rated load voltage
Max. load current 50 mA

Leakage current 100 µA max.

BCD Output

I/O signal name Item Rating

Inputs REQUEST, HOLD, MAX, MIN, RESET Input signal No-voltage contact input

Outputs DATA, POLARITY, OVERFLOW,

DATA VALID, RUN

Note: Logic method: negative logic

10 mA at 5 VDC

100,000 times min. (at a rated load switching frequency of 1,800 times/hr)

12 to 24 VDC

+10%

/

–15%

Input current with no-voltage input 10 mA
Signal level ON voltage: 1.5 V max.

Rated load voltage
Max. load current 10 mA

Leakage current 100 µA max.

OFF voltage: 3 V min.
12 to 24 VDC

+10%

/

−15%

Timers

Linear Output

Item 4 to 20 mA 1 to 5 V 1 mV/10 digits (see note)
Resolution 4,096
Output error ±0.5% FS ±1.5% FS
Permissible load resistance 600 Ω max. 500 Ω min. 1 KΩ min.

Note: For the 1 mV/10-digit output, the output voltage changes for every 40 to 50 increment in the display value.

■ Communications Specifications

Item RS-232C, RS-422 RS-485
Transmission method 4-wire, half-duplex 2-wire, half-duplex
Synchronization method Start-stop synchronization
Baud rate 1,200/2,400/4,800/9,600/19,200/38,400 bps
Transmission code ASCII (7-bit)
Communications Write Comparative set value, prescaling value, remote/local programming, reset control of maximum/mini-

Read Process value, comparative set value, maximum value, minimum value, model data, error code, and

For details, refer to Communication Operation Manual.

mum values, and other setting mode items excluding communications conditions.

others

Period Meter K3NP B-197

Connections

■ Terminal Arrangement

Output unit

Output
unit

Input
unit

Terminal Numbers

18 19 20 21 22 23 24 25 26

10 11 12 13 14 15 16 17

1 2 3 4 5 6 7 8 9

Input Unit

12 VDC
80 mA

Signal input terminal

NPN Inputs

External
sensor
power
supply (+)

Input A

Input B

External
sensor
power
supply (−)

+12 V

10

820 Ω

1

820 Ω

2

11

GND

Input unit

100 to 240 VAC
or 12 to 24 VDC

Note: Check the power supply specifications of the

model used before connecting the power supply.
Recommended 24VDC power supply;
eg. OMRON S8VS

Voltage Pulse Inputs

+12 V

10 k Ω

3

Input A

Input B

10 k Ω

4

11

GND

590 Ω

590 Ω

+12 V

Internal circuits

Note: Terminals 7 to 13 are connected internally.

Terminals 7 and 11 are mutually isolated.

When inputting the external control signals through the open
collector:

Transistor Inputs:
ON: Residual voltage must be 3 V max.
OFF: Leakage current must be 1.5 mA max.
The switching capacity must be 20 mA or greater.

When the external signal input is short-circuited, a voltage of
approximately 5 V will be applied to between the terminals 5 to
7 and the COM terminal, and a current of approximately 18 mA
(nominal value) will flow.

PNP-input Models

External
sensor
power
supply (+)

Input A

Input B

External
sensor
power
supply (−)

+12 V

10

1

820 Ω

590 Ω

+12 V

2

820 Ω

11

GND

590 Ω

GND

Internal circuits

GND

820 Ω

820 Ω

GND

GND

+12 V

590 Ω

+12 V

590 Ω

Internal circuits

(NPN Linear 2-wire Output)

10 1 1

1234

+12 V

INA INB

0 V

Note: When the contact is short-

NPN output sensor

Note: Connect the + side of the NPN

linear 2-wire input to terminal 1
and the − side to terminal 11.

B-198 Period Meter K3NP

Contact Output Voltage Output PNP Open Collector OutputNPN Open Collector Output

10 11

1234

INA INB GND

Contact

circuited, a current of approxi­mately 13 mA will flow at a volt­age of approximately 12 V.

Input resistance: 10 kΩ

10 11

+12V

1234

INA INB

0 V

Voltage pulse output sensor

Note: With voltage pulse input

not from a 3-wire sensor,
connect the + side to ter­minal 3 and the − side to
terminal 11.

+12V

10 11

1234

INA INB

0 V

PNP output sensor

Output Units

K31-C1: Relay (3 Outputs)

Outputs (5 A max. at 250 VAC)

H PASS L

18 19 20 21 22 23 24 25 26

K31-C5: Relay (5 Outputs)

18 19 20 21 22 23 24 25 26

Outputs (5 A max. at 250 VAC)

H

HH PASS L

LL

K31-T2: Transistor (PNP Open Collector)

Outputs (50 mA max. at 24 VDC)

HH H PASS L LL COM

18 19 20 21 22 23 24 25 26

K31-L1, L2, L3,-L4, -L5, -L6, -L7, -L8, -L9,

-L10: Linear

(Terminals 21 to 26 are provided only on K31-L4,

-L5, -L6, -L9, -L10.)

L1, L4: 4 to 20 mA
L2, L5: 1 to 5 V
L3, L6: 1 mV/10 digit
L7, L9: 0 to 5 VDC
L8, L10: 0 to 10 VDC

+ −

18 19 20 21 22 23 24 25 26

Outputs (50 mA max. at 24 VDC)

HH H PASS L LL COM

K31-C2: Relay (5 Outputs)

Outputs (5 A max. at 250 VAC)

HH PASS L

18 19 20 21 22 23 24 25 26

LLH

K31-T1: Transistor (NPN Open Collector)

Outputs (50 mA max. at 24 VDC)

18 19 20 21 22 23 24 25 26

HH H PASS L LL COM

K31-B2, -B4: BCD (NPN Open Collector)

(Terminals 32 to 36 are provided only on K31-B4.)

4

10

DATA OVERFLOW

DATA VALID

RUN

COMMON

REQUEST

MAX. REQ.

MIN. REQ.

HOLD

RESET

POLARITYHHH

PASSLLL

10310

COMMON

4

48

20

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37

1 2 3 4 5 6 7 8 9 10111213141516171819

12 4812 48 12 48 12 48 12

COMMON

0

10

1

10

2

10

K31-FLK1: RS-232C

14

15 16 17 18 19 20 21 22 23 24 25

12345678910111213

Timers

Note: With K31-L4/-L5/-L6/-L9/-L10 models, terminals 19

and 26 are connected internally.

K31-FLK2, -FLK5: RS-485

(Terminals 21 to 26 are provided only on K31-FLK5.)

Terminator

ON

RS-485

+ −

18 19 20 21 22 23 24 25 26

Outputs (50 mA max. at 24 VDC)

OFF

HH H PASS L LL COM

• D-sub 37P Connectors for BCD output (attachment)

Plug: XM2A-3701
Hood: XM2S-3711

• D-sub 25P connectors for RS-232C output (K31-FLK1) (order

separately)
Plug: XM2A-2501
Hood: XM2S-2511

• D-sub 9P connectors for RS-422 output (K31-FLK3 and K31-

FLK6) (order separately)
Plug: XM2A-0901
Hood: XM2S-0911

• D-sub 9P connectors for RS-232C output (K31-FLK4) (order

separately)
Plug: XM2D-0901
Hood: XM2D-0911

SD

RD

SG

K31-FLK3, -FLK6: RS-422

(The right connector is provided only on K31-FLK6)

Output NPN Tr.
(50 mA max. at 24 VDC)

SDB

LL

6

789

12345

H

HH

COM

PASS

L

Terminator

ON

OFF

RS-422

RS-422

RDA

6

789

1

2345

RDB

SDA

SG

K31-FLK4: RS-232C + Transistor (NPN Open Collector)

Output NPN Tr.

RS-232C

87

9

5

4321

SG

SD

(50 mA max. at 24 VDC)

6

RD

87

9

5

4321

L

PASS

COM

LL

6

H

HH

Period Meter K3NP B-199

■ Block Diagram

Power supply
for sensor

Sensor A

Sensor B

GND

Control input

Control power
supply

Input circuit

Control input
circuit

Power supply
circuit

Frequency
measurement
circuit

Waveform
adjustment
circuit

Voltage stabilizing
circuit

Voltage stabilizing
circuit

Voltage stabilizing
circuit

Key
switch

8-bit
microcomputer

Power supply for
sensor (input circuit)

Frequency measurement circuit
Waveform adjustment circuit

8-bit microcomputer

Control input circuit

LED

Output
circuit

B-200 Period Meter K3NP