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Appendices
NX-series Position Interface Units User’s Manual (W524)
A-1 Datasheets
A
A-1-2 Incremental Encoder Input Units
NX-EC0212
Unit name Incremental Encoder Input Units Model NX-EC0212
Number of channels
2 channels
Type of external con-
nections
Screwless clamping terminal block
(12 terminals)
I/O refreshing method
*1
Free-Run refreshing, synchronous I/O refreshing, or task period prioritized refreshing
Indicators
Refer to NX-EC0212 and
NX-EC0222 on page 6-10.
Input signals
Counter: Phases A, B, and Z
External Inputs: None
Input form Voltage input (24 V)
Counting unit Pulses
Pulse input method
Phase differential pulse (multiplication x2/4), pulse + direction inputs, or up and down pulse
inputs
Counter range −2,147,483,648 to 2,147,483,647 pulses
Counter functions
Counter type Ring counter or linear counter
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
Voltage input specifications
Input voltage
20.4 to 28.8 VDC (24 VDC
+20%, −15%)
ON voltage
19.6 VDC min./3 mA min.
Input current 4.2 mA typical (24 VDC) OFF voltage 4.0 VDC max./1 mA max.
Maximum response
frequency
Phases A and B: Single-phase 500 kHz (phase differential pulse input x4: 125 kHz), Phase Z:
125 kHz
Internal I/O com-
mon processing
NPN
External input specifications
Input voltage
---
ON voltage/ON cur-
rent
---
Input current
---
OFF voltage/OFF
current
---
ON/OFF response
time
---
Internal I/O com-
mon processing
---
Dimensions 12 × 100 × 71 mm (W×H×D) Isolation method Photocoupler isolation
Insulation resistance
20 MΩ min. between isolated cir-
cuits (at 100 VDC) Dielectric strength
510 VAC between isolated circuits
for 1 minute with leakage current of
5 mA max.
I/O power supply
method
Supplied from the NX bus.
20.4 to 28.8 VDC (24 VDC
+20%, −15%)
Current capacity of
I/O power supply ter-
minals
IOV: 0.3 A max. per terminal
IOG: 0.3 A max. per terminal
NX Unit power con-
sumption
0.85 W max.
Current consump-
tion from I/O power
supply
None
Weight 70 g max.
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