Datasheet
24 Remote I/O
Digital I/O unit (with Fujitsu connector)
Item Specifications
Model NX-MD6121-6
Name DC input/transistor output unit
Capacity 16 inputs/16 outputs
Output section (CN1)
Internal I/O common NPN
Rated voltage 12 to 24 VDC
Operating load voltage 10.2 to 28.8 VDC
Maximum value of load
current
0.5 A/point, 2 A/NX unit
Maximum inrush current 4.0 A/point, 10 ms max.
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON/OFF response time 0.1 ms max./0.8 ms max.
Input section (CN2)
Internal I/O common For both NPN/PNP
Rated input voltage 24 VDC (15 to 28.8 VDC)
Input current
*1
*1. Typical rated current at 24 VDC.
7 mA
ON voltage 15 VDC min.
ON current 3 mA min.
OFF voltage 5 VDC max.
OFF current 1 mA max.
ON/OFF response time 20 s max./400 s max
Input filter time No filter, 0.25 ms, 0.5 ms, 1 ms (default), 2 ms, 4 ms, 8 ms, 16 ms, 32 ms, 64 ms, 128 ms, 256 ms
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
Unit power consumption 0.70 W max.
I/O power supply method Supply from external source
I/O current consumption 30 mA max.
Current capacity of I/O power
supply terminal
Without I/O power supply terminals
I/O refreshing method Switching synchronous I/O refreshing and free-run refreshing
Terminal block type 2 Fujitsu connectors
24 terminals
Dimensions (W x H x D) 30 × 100 × 71 mm
Weight 95 g max.
Disconnection/short-circuit
detection
Not supported
Protective function Not supported
Terminal wiring
Circuit layout
NX-MD6121-6
CN1 (left) output circuit
OUT0
to OUT15
COM0
+V0
+V0
COM0
Internal circuits
Connector
NX-MD6121-6
CN1 (left) output terminal
V0
NC
NC
OUT15
OUT13
COM0
OUT14
OUT12
OUT10
OUT9
OUT8
OUT11
B10
B8
B6
B9
B7
B5
B3
B2
B1
B4
A10
B11 A11
B12 A12
BA
A8
A6
A9
A7
A5
A3
A2
A1
A4
Signal nameSignal name
12 to 24 VDC
+V0
NC
NC
OUT7
OUT5
COM0
OUT6
OUT4
OUT2
OUT1
OUT0
OUT3
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
CN2 (right) input circuit
IN0
to
IN15
COM1
COM1
Input indicator
3.3 k
Internal circuits
Connector
CN2 (right) input terminal
Signal nameSignal name
A3
A5
A7
A4
A6
A8
A10
A11
A12
A9
B3
A2 B2
A1 B1
AB
B5
B7
B4
B6
B8
B10
B11
B12
B9
IN0
IN2
IN4
IN1
IN3
IN5
IN7
COM1
NC
NC
NC
IN6
IN8
IN10
IN12
IN9
IN11
IN13
IN15
COM1
NC
NC
NC
IN14
24 VDC
NX bus
connector
(left)
NX bus
connector
(right)
I/O power
supply
I/O power
supply –
I/O power
supply
I/O power
supply –
NX bus
connector
(left)
NX bus
connector
(right)
I/O power
supply
I/O power
supply –
I/O power
supply
I/O power
supply –
Connector
pin
Connector
pin
• Be sure to wire both pins A9 and B9 (COM0) of CN1.
• Be sure to wire both pins A10 and B10 (V0) of CN1.
• The polarity of the input power supply of CN2 can be connected in either direction.
• Be sure to wire both pins A9 and B9 (COM1) of CN2, and set the same polarity for both pins.