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NX-RS[][][][]

NX-series Load Cell Input Unit

NX-RS[][][][]

Build a cost saving weighing/ measurement system by using load cells

Item list of NX-RS[][][][]

about this Product Family

Related Contents

last update: October 11, 2016

General Specification

Item Specification
Enclosure Mounted in a panel
Grounding methods Ground of 100 Ω or less
Operating
environment		 Ambient operating temperature 0 to 55°C
Ambient operating humidity 10 to 95% RH (with no icing or condensation)
Atmosphere Must be free from corrosive gases.
Ambient storage temperature -25 to 70°C (with no icing or condensation)
Altitude 2,000 m max.
Pollution degree Pollution degree 2 or less: Conforms to JIS B 3502 and IEC 61131-2.
Noise immunity Conforms to IEC 61000-4-4, 2 kV (power supply line)
Overvoltage category Category II: Conforms to JIS B 3502 and IEC 61131-2.
EMC immunity level Zone B
Vibration resistance Conforms to IEC 60068-2-6.
5 to 8.4 Hz with amplitude of 3.5 mm,
8.4 to 150 Hz, acceleration of 9.8 m/s2
100 min each in X, Y, and Z directions
(10 sweeps of 10 min each = 100 min total)
Shock resistance Conforms to IEC 60068-2-27, 147 m/s2, 3 times each in X, Y,
and Z directions
Applicable standards * cULus: Listed (UL61010-2-201), ANSI/ISA 12.12.01, EU: EN 61131-2,
RCM, KC: KC Registration

* Ask your OMRON representative for the most recent applicable standards for each model.

Function Specification

Supported: Functions that are used in target applications
-: Functions that are not used in target applications

Function Application Description
Weight
measurement
*1		 Force
measurement
*2
I/O refreshing
ethod
setting *3		 Supported. Supported. Sets Free-Run refreshing, synchronous I/O refreshing,*4 or task
period prioritized refreshing*5 for the I/O refreshing*6 method.
Actual load
calibration		 Supported. Supported. This is a user calibration function that is performed by placing an
actual load on the load cell.
Equivalent input
calibration		 Supported. Supported. This is a user calibration function that is performed by inputting
the rated output, rated capacity, and zero balance values of the
load cell.
Gravity
acceleration
correction		 Supported. - This function corrects errors in the gross weight values that occur
due to the difference of gravity acceleration at each site when the
site where the actual load calibration of the device is executed
and the installation site are different.
Digital filtering Supported. Supported. This function uses the digital filter to remove noise components
that are contained in input signals to suppress fluctuations of
measurement values. You can use the digital low-pass filter and
moving average filter.
Zero set/
zero reset		 Supported. Supported. The zero set function corrects the gross weight value/force
measurement value to be the zero point within the set range at
a desired time.
The zero reset function resets the zero point correction that is
performed with the zero set function.
Zero tracking Supported. - This function automatically corrects the zero point within the set
range.
Zero point range
over detection		 Supported. Supported. This function detects when the gross weight value/force
measurement value exceeds the set zero point range.
Tare subtraction Supported. - This function subtracts the tare weight value from the gross weight
value to acquire the net weight value. There are two types of this
function: one-touch tare subtraction and digital tare subtraction.
One-touch tare
subtraction		 Supported. - This function stores the gross weight value at the specified timing
as the tare value and subtracts it from a given gross weight value
to acquire the net weight value.
Digital tare
subtraction		 Supported. - This function subtracts the preset digital tare value from the gross
weight value to acquire the net weight value.
Stable detection Supported. - This function detects whether the gross weight value is stable.
Over range/under
range detection		 Supported. Supported. This function detects when the input signal exceeds the input
conversion range.
Sensor
disconnection
test		 Supported. Supported. This function tests if the cable that connects the Load Cell Input
Unit and load cell is disconnected. During the sensor
disconnection test, you cannot measure the weight or force.
Input value
refreshing
stop		 Supported. Supported. This function stops refreshing the input value in a specified period.
Peak hold/
bottom hold		 - Supported. This function continues holding the peak value or the bottom
value of the force measurement value in a specified period.
Data tracing Supported. Supported. This function records the values in REAL data in the buffer of the
Load Cell Input Unit and exports the data to a CSV file.
These values indicate the gross weight values/force
measurement values before and after the digital filtering in a
specified period.
Decimal point
position setting		 Supported. Supported. This function sets the number of digits which is displayed after the
decimal point for each DINT data.

*1. It is used to measure the weight in the unit of kg or t.
*2. It is used to measure the force in the unit of N or kN.
*3. Select with the Communications Coupler Unit setting. Refer to the NX-series Load Cell Input Unit User’s Manual
       (W565) for details on the setting method.
*4. You can select this option only when the Unit is used with an EtherCAT Coupler Unit with EtherCAT communications
       in DC Mode.
*5. You can select this option only when the Unit is used with an EtherCAT Coupler Unit NX-ECC203 with EtherCAT
       communications in DC Mode.
*6. This is the data exchange with the Controller.

Individual Specifications

Load Cell Input Unit

NX-RS1201

Unit name Load Cell Input Unit Model NX-RS1201
Number of points 1 point External connection
terminals		 Screwless clamping terminal block
(16 terminals)
I/O refreshing
method		 Free-Run refreshing, synchronous I/O refreshing, or task period prioritized refreshing
Indicators TS indicator
3538_sp_3_1		 Input range -5.0 to 5.0 mV/V
Input conversion
range		 -5.5 to 5.5 mV/V
Load cell excitation
voltage		 5 VDC ± 10%, Output current:
60 mA max.
Zero point adjustment
range		 -5.0 to 5.0 mV/V
Gain point adjustment
range		 -5.0 to 5.0 mV/V
Accuracy
*1		 Nonlinearity ±0.01% (full scale) *2
Zero drift ±0.1 μV/°C RTI
Gain drift ±10 ppm/°C
A/D converter
resolution		 24 bits
Warm-up period 30 minutes Conversion cycle 125 μs
Dimensions 12 (W) × 100 (H) × 71 (D) Isolation method Between the input and the NX bus:
Power = Transformer,
Signal = Digital isolator
Insulation
resistance		 20 MΩ min. between isolated
circuits (at 100 VDC)		 Dielectric strength 510 VAC between isolated circuits
for 1 minute at a leakage current
of 5 mA max.
I/O power supply
method		 No supply Current capacity of I/O
power supply terminal		 Without I/O power supply terminals
NX Unit power consumption • Connected to a CPU Unit
2.05 W max.
• Connected to a Communications
Coupler Unit
1.70 W max.		 Current consumption
from I/O power supply		 No consumption
Weight 70 g max.
Circuit layout 3538_sp_3_2
Installation
orientation
and restrictions		 Installation orientation:
• Connected to a CPU Unit: Possible in upright installation.
• Connected to a Communications Coupler Unit: Possible in 6 orientations.
Restrictions: No restrictions
Terminal
connection
diagram

Diagram of the 6-wire connection between the Unit and a load cell.
3538_sp_3_3
 


Diagram of the 4-wire connection between the Unit and a load cell.
3538_sp_3_4

*1. Accuracy for when the load cell and the Load Cell Input Unit are connected with the 6-wire connection.
*2. The value for when the Load Cell Unit is used under the following conditions.
       Full scale: 0.0 to 5.0 mV/V or -5.0 to 0.0 mV/V
       Ambient temperature: 25°C
       Setting of digital filtering: Default

Version Information

Connecting with CPU Units

Refer to the user's manual for the CPU Unit for the CPU Unit to which NX Units can be connected.

NX Unit Corresponding versions *
Model Unit version CPU Unit Sysmac Studio
NX-RS1201 Ver.1.0 Ver.1.13 or later Ver.1.17 or higher

* Some Units do not have all of the versions given in the above table. If a Unit does not have the specified version, support is provided by the oldest available version after the specified version. Refer to the user’s manuals for the specific Units for the relation between models and versions.

Connecting with Coupler Units

NX Unit Corresponding versions *
EtherCAT EtherNet/IP
Model Unit
version		 Communications
Coupler Unit		 NJ/NX-series CPU
Units or NY-series
Industrial PCs		 Sysmac
Studio		 Communications
Coupler Unit		 Sysmac
Studio
NX-RS1201 Ver.1.0 Ver.1.0 or later Ver.1.05 or later Ver.1.16 or
higher		 Ver.1.0 or later Ver.1.16 or
higher

*. Some Units do not have all of the versions given in the above table. If a Unit does not have the specified version,
       support is provided by the oldest available version after the specified version. Refer to the user’s manuals for
       the specific Units for the relation between models and versions.

last update: October 11, 2016

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