Datasheet

40 Remote I/O
Load cell input unit
Item Specifications
Model NX-RS1201
Name Load cell input unit
Number of inputs 1 input
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
*1. Accuracy when the load cell and the load cell input unit are connected with the 6-wire connection.
Nonlinearity ±0.01% (full scale)
*2
*2. The value for when the load cell unit is used in the following conditions: Full scale: 0.0 to 5.0 mV/V or -5.0 to 0.0 mV/V. Ambient temperature: 25ºC. Setting of dig-
ital filtering: Default.
Zero drift ±0.1 V/ºC RTI
Gain drift ±10 ppm/ºC
A/D converter resolution 24 bits
Conversion cycle 125 s
Warm-up period 30 minutes
Dielectric strength 510 VAC between isolated circuits for 1 minute at a leakage current of 5 mA max.
Insulation resistance 20 M min. between isolated circuits (at 100 VDC)
Isolation method Between the input and the NX bus: Power = Transformer, Signal = Digital isolator
Unit power consumption 1.70 W max.
I/O power supply source No supply
Current consumption from I/O power supply No consumption
Current capacity of I/O power supply terminal Without I/O power supply terminals
I/O refreshing method Free-run refreshing or synchronous I/O refreshing
*3
*3. The I/O refreshing method is automatically set according to the connected communication unit and CPU unit.
Terminal block type Screwless push-in terminal
16 terminals (A + B with FG)
Dimensions (W x H x D) 12 × 100 × 71 mm
Weight 70 g max.
Terminal wiring
NX-RS1201
Circuit layout
NX-RS1201
SHLD
SIG 
SIG +
S 
S +
EXC +
EXC +
I/O power supply +
I/O power supply 
I/O power supply +
I/O power supply 
EXC 
EXC 
SHLD
Diagram of the 6-wire connection between the Unit and a load cell.
Diagram of the 4-wire connection between the Unit and a load cell.
SHLD
NC
SHLD
EXC EXC
SIG S
EXC+ EXC+
SIG+ S+
NC
NC NC
Load cell
Shield
Ground of 100 Ω or less
A1 B1
A8 B8
SHLD
NC
SHLD
EXC EXC
SIG S
EXC+ EXC+
SIG+ S+
NC
NC NC
Load cell
Ground of 100 Ω or less
A1 B1
A8 B8
Shield
AD conversion
circuit
Power supply
circuit
Terminal
block
NX bus
connector
(left)
NX bus
connector
(left)
DIN Track contact plate
(Unit back surface)
Load cell
input unit
Load cell
input unit