7 - 21
7 Digital Output Units
NX-series Digital I/O Unit User’s Manual (W521)
7
-6 Precau
tion
s when
Using
th
e Relay Ou
tpu
t Un
it
s
7
7-6
Precautions when Using the Relay
Output Units
This section describes precautions when using the Relay Output Units.
The service life of Relay Output Units depends on the type of load, contact current and ambient temper-
ature.
Use the following diagrams to calculate the relay service life based on the operating conditions, and
replace the NX Unit before the end of its service life.
Contact Current vs. Service Life Characteristic
Precautions for Correct Use
The above chart shows the life characteristics for individual relays. Do not exceed the specifi-
cations of the Relay Output Units. If a switching capacity exceeding the specifications is used,
the reliability and life expectancy of other parts will be reduced and the NX Unit may malfunc-
tion.
Relay Service Life
Service life (
×10 times)
4
Switching frequency: 20 operations/minute
500
300
200
100
50
30
20
5
3
2
1
10
5
3
2
1
10
0.5
0.3
0.2
0.1
Contact current (A)
Service life curve
24 VDC/250 VAC
Resistance loads
24
VAC
Summary of Contents for NX-IA3117
Page 34: ...Sections in this Manual 32 NX series Digital I O Unit User s Manual W521...
Page 52: ...1 Features and System Configuration 1 18 NX series Digital I O Unit User s Manual W521...
Page 56: ...2 Specifications 2 4 NX series Digital I O Unit User s Manual W521...
Page 152: ...5 I O Refreshing 5 36 NX series Digital I O Unit User s Manual W521...
Page 204: ...8 Digital Mixed I O Units 8 8 NX series Digital I O Unit User s Manual W521...
Page 224: ...9 Troubleshooting 9 20 NX series Digital I O Unit User s Manual W521...
Page 230: ...10 Inspection and Maintenance 10 6 NX series Digital I O Unit User s Manual W521...
Page 337: ...I 1 I NX series Digital I O Unit User s Manual W521 Index...
Page 340: ...I 4 NX series Digital I O Unit User s Manual W521 Index...
