The purpose of this document is to give detailed informations about the lifetime of batteries inside the Quantum CPUs. The estimation of these lifetimes are based on data from components manufacturers.
The lifetime information is estimated for:
-
Two ambient temperatures for the PLC location:
-
Three different usage cases of the CPU: 92%, 66% and 33% of PLC power-up time. These values are for the following customer configurations:
-
92%: PLC powered up all year long except during one month of maintenance,
-
66%: PLC powered up all year long except during all weekends plus one month of maintenance,
-
33%: PLC powered up all year long 12 hours a day, except during all weekends plus one month of maintenance.
The table below presents the lifetime of CPU battery:
|
Power-up time
|
92%
|
66%
|
33%
|
|
|
Typical
|
Minimum
|
Typical
|
Minimum
|
Typical
|
Minimum
|
|
Lifetime in Years
|
27.1
|
10.4
|
11.0
|
4.0
|
6.4
|
2.70
|
Minimum Lifetimes of the CPU Battery, in a Powered Down PLC
In a powered down PLC, the minimum lifetimes of the main battery is 1.5 years at 60 °C and 4.6 years at 25 °C.
