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MELSEC-Q
1 GENERAL SPECIFICATIONS AND PRECAUTIONS FOR USE
(7) 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
Applicable module: QY10, QY10-TS, QY18A
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.
100VAC cos =0.35
120VAC cos =0.2
240VAC cos =0.2
200VAC cos =0.7
100VAC cos =0.7
200
100
70
50
30
20
10
7
5
3
2
1
0.1 0.2 0.3 0.5 0.7 1 2 3 5
30VDC =0ms
200VAC cos =0.35
24VDC =7ms
100VDC
=7ms
Switching life (10,000 times)
Switching current (A)
(L/R): Time constant
cos : Power factor
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