User`s manual

7-28
(7) Life of relays of the relay output module
The relay's life of the module (JW-204SA/214SA), which uses a relay in output circuit, varies
depending on the kind of loads (difference of the power rate of the signal on the contact point is AC
or DC and its current value). The following shows characteristic curves of the relay contact point.
Note 1: The above chart shows standard values.
Depending on the environment of usage (ambient temperature and humidity), different life
may result.
Note 2: When the signal to the contact point is DC, the life of relays varies according to the load rise
characteristics (time constant: T) of the load. The load rise characteristics of the load after the
contact point is turned ON are determined by inductance: L and resistance: R
For the time constant of the load used, see below:
In case of resistance load: T < 1ms
In case of small size relay: T =7 ms
In case of large current L load and magnet: T = 40ms
In case of the L load with a diode for surge countermeasure, the life of relays may be similar to the
case of T < 1ms.
Note 3: Use the relay output module, with the contact switching life of more than 100,000 times and
within the current capacity of less than 2A.
T＝
R
L
Max. 2,000,000 times
200
100
70
50
30
10
7
5
3
1
0.1 0.3 0.5 0.7 1 2 3 4 5
30 VDC T = 0
30 VDC T = 7 ms
30 VDC T = 60ms
30 VDC T = 40ms
120 VAC COSφ=1
250 VAC COSφ=1
120 VAC COSφ= 0.
4
250 VAC COSφ= 0.
4
Switching current (A)
No. of switching (x 10,000 times)