Datasheet
34 Remote I/O
Position interface unit
Incremental encoder input unit
Item Specifications
Model NX-EC0112 NX-EC0122 NX-EC0212 NX-EC0222 NX-EC0132 NX-EC0142
Name Incremental encoder input unit
Number of channels 1 channel 2 channels 1 channel
Input signals Counter: Phases A, B and Z
External inputs: 3
Counter: Phases A, B and Z
External inputs: None
Counter: Phases A, B and Z
External inputs: 3
Input form Type NPN type
500 kHz
PNP type
500 kHz
NPN type
500 kHz
PNP type
500 kHz
Line driver, 4 MHz
Specifications
Voltage 20.4 to 28.8 VDC (24 VDC +20%/–15%)
ON voltage: 19.6 VDC min./3 mA min.
OFF voltage: 4.0 VDC max./1 mA max.
EIA standard RS-422-A line driver
levels
Impedance: 120 ±5%
Level input voltage: V
IT+
: 0.1 V min.
V
IT-
: 0.1 V min.
Hysteresis voltage: Vhys
(V
IT+
- V
IT-
): 60 Mv
Current 4.2 mA (24 VDC)
5 V power supply for
encoder
– Output voltage: 5 VDC ±5%
Output current: 500 mA max.
Maximum response
frequency
Phases A and B: Single-phase 500 kHz (phase difference pulse input × 4:
125 kHz), Phase Z: 125 kHz
Phases A and B: Single-phase 4 MHz
(phase differential pulse input × 4:
1 MHz), Phase Z: 1 MHz
Counting units Pulses
Pulse input method Phase difference pulse (multiplication × 2/4), pulse + direction inputs or up and down pulse inputs
Counter range –2,147,483,648 to 2,147,483,647 pulses
Counter functions Type Ring counter or linear counter
Controls Gate control, counter reset and counter preset
Latch function Two external input latches and one internal latch
Measurements Pulse rate measurement and pulse period measurement
External input
specifications
Input voltage 20.4 to 28.8 VDC
(24 VDC +20%/–15%)
– 20.4 to 28.8 VDC
(24 VDC +20%/–15%)
Input current 4.6 mA (24 VDC) – 3.5 mA (24 VDC)
ON voltage/ON current 15 VDC min./3 mA min. – 15 VDC min./3 mA min.
OFF voltage/OFF current 4.0 VDC max./1 mA max. – 5.0 VDC max./1 mA max.
ON/OFF response time 1 s max./2 s max. – 1 s max./1 s max.
Internal I/O common NPN PNP – NPN PNP
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 Photocoupler isolation Digital isolator
Unit power consumption 0.85 W max. 0.95 W max. 0.85 W max. 0.95 W max. 0.95 W max. 1.05 W max.
I/O power supply source Supplied from the NX bus. 20.4 to 28.8 VDC (24 VDC +20%/–15%)
Current consumption from I/O power supply None 30 mA
Current capacity of I/O power supply terminal 0.3 A max. per terminal for encoder
supply section and 0.1 A max. per
terminal for other sections
0.3 A max. per terminal 0.1 A max. per terminal
I/O refreshing method Free-run refreshing or synchronous I/O refreshing
*1
*1. 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)
Screwless push-in terminal
12 terminals (A + B)
Screwless push-in terminal
12 terminals x 2 [(A + B) x 2]
Dimensions (W x H x D) 12 × 100 × 71 mm 24 × 100 × 71 mm
Weight 70 g 130 g
Failure detection None
Protection None
A
Z
IOV
IOG
I0
I2
B
NC
IOV
IOG
I1
NC
IOG IOG
IOV IOV
Sensor 1
Sensor 2
Sensor 3
Encoder
Terminal wiring
NX-EC0112
Circuit layout
NX-EC0112
A
Z
IOV
IOG
I0
I2
B
NC
IOV
IOG
I1
NC
IOG IOG
IOV IOV
Sensor 1
Sensor 2
Sensor 3
Encoder
NX-EC0122NX-EC0122
A, B, Z
I0 to I2
IOG
Current limiter
IOV
I/O power supply +
I/O power supply
I/O power supply +
I/O power supply
Terminal block
Inter-
nal
cir-
cuits
Right-side
NX bus
connector
I/O power supply +
I/O power supply
Right-side
NX bus
connector
I/O power supply +
I/O power supply
Left-side
NX bus
connector
Left-side
NX bus
connector
Left-side
NX bus
connector
Current limiter
Inter-
nal
cir-
cuits
A, B, Z
I0 to I2
IOG
IOV
Terminal block