Rockwell Automation 1606-XLSPRED Power Supply Reference Manual - Manual (Page 6)

All parameters are specified at 24V, 2.5A, 230Vac input, 25ªC ambient and after a 5 minutes run-in time unless noted otherwise.
6 Rockwell Automation Publication 1606-RM035A-EN-P — April 2014
Bulletin 1606 Switched Mode Power Supplies
5. Lifetime Expectancy and MTBF
The redundancy module has two input channels which are completely independent from each other. Each control
circuit, auxiliary voltage source, or other circuitry in the module is designed separately for each input. The dual input
redundancy module can be considered as two single redundancy modules combined together in one housing. The only
common point is the circuit trace that ties the two separate circuits together at the output.
The MTBF figures below are for the entire dual input module. If the MTBF number of only one path is needed, simply
double the value from the table.
The redundancy module does not include electrolytic capacitors. Therefore, the lifetime expectancy is extremely high.
Input / output
current conditions Input: 2x5A
Output: 10A
Lifetime expectancy *) min. 25 years at 24V and 40°C
min. 25 years at 24V and 25°C
MTBF **) SN 29500, IEC 61709 84 868 000h at 24V 40°C
125 266 000h at 24V 25°C
MTBF **) MIL HDBK 217F 71 454 000h at 24Vand 40°C (Ground Benign GB40)
81 453 000h at 24Vand 25°C (Ground Benign GB25)
*) The Lifetime expectancy shown in the table indicates the minimum operating hours (service life).
**) MTBF stands for Mean Time Between Failure, which is calculated according to statistical device failures, and indicates reliability of a
device. It is the statistical representation of the likelihood of a unit to fail and does not necessarily represent the life of a product.
The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g. 1 000 000h means that
statistically one unit will fail every 100 hours if 10 000 units are installed in the field. However, it can not be determined if the failed unit
has been running for 50 000h or only for 100h.