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CHAPTER 3 BEFORE USING I/O MODULE
3
3.2 Output Module
(3) Precautions for using the contact output module
When using the contact output module, consider the following.
• Relay life (contact switching life)
• Effects to relay life due to connected load
• Measures against back EMF
(a) Relay life (contact switching life)
Applicable module LY10R2, LY18R2A
The relay life depends on the operating environment. Select a module according to the operating environment.
The relay lives shown below are the actual service values, not the guaranteed values. Replace the module well
in advance since the actual switching life may be shorter than the one shown below.
Operating environment Switching life
Rated switching voltage/current, rated load 100 thousand times
200VAC 1.5A, 240VAC 1A (COS = 0.7) 100 thousand times
200VAC 0.4A, 240VAC 0.3A (COS = 0.7) 300 thousand times
200VAC 1A, 240VAC 0.5A (COS = 0.35) 100 thousand times
200VAC 0.3A, 240VAC 0.15A (COS = 0.35) 300 thousand times
24VDC 1A, 100VDC 0.1A (L/R = 7ms) 100 thousand times
24VDC 0.3A, 100VDC 0.03A (L/R = 7ms) 300 thousand times
200
100
70
50
30
20
10
7
5
3
2
0.1 0.2 0.3 0.5 0.7 1 2 3 5
Switching life
(10,000 times)
Switching current (A)
1
(L/R) : Time constant
cos
: Power factor
100VDC
30VDC =0ms
240VAC cos =0.2
120VAC cos =0.2
200VAC cos =0.7
100VAC cos =0.7
200VAC cos =0.35
100VAC cos =0.35
24VDC =7ms
=ms7