Beckhoff PS1111-2403-0002, Documentation

Page: 19 / 31

Technical data, mounting, wiring
PS1111-2403-0002 19 Version: 1.0
3.10 Lifetime expectancy
The lifetime expectancy shown in the table indicates the minimum number of operating hours (service life)
and is determined by the lifetime expectancy of the built-in electrolytic capacitors. The lifetime expectancy is
stated in operating hours and is calculated according to the specifications of the capacitor manufacturer.
Please note: The manufacturer of the electrolytic capacitors only guarantees a maximum life of up to 15
years (131,400h). Any number exceeding this value represents a calculated theoretical service life which can
be used to compare devices.
AC 100V AC 120V AC 230V
Lifetime
expectancy 39,000h 64,000h 102,000h At 24V, 3.8A and +40°C
260,000h 292,000h 309,000h At 24V, 1.9A and +40°C
91,000h 147,000h 287,000h At 24V, 3.8A and +25°C
640,000h 720,000h 815,000h At 24V, 1.9A and +25°C
3.11 MTBF
MTBF stands for M ean T ime B etween F ailure, which is calculated from the statistical failure rate of the
components and indicates the reliability of a device. It is a statistical representation of the probability of
equipment failure and does not necessarily represent the service life of a product.
The MTBF number is a statistical representation of the probability of equipment failure. An MTBF number of
1,000,000h, for example, means that statistically, if there are 10,000 devices in use, one device will fail every
100 hours. However, it is not possible to say whether the failed device has been in operation for 50,000
hours or only 100 hours.
For these device types the MTTF value ( M ean T ime T o F ailure) is identical to the MTBF value.
AC 100V AC 120V AC 230V
MTBF SN 29500,
IEC 61709 1,174,000h 1,273,000h 1,507,000h At 24V, 3.8A and 40°C
2,251,000h 2,406,000h 2,752,000h At 24V, 3.8A and +25°C
MTBF MIL HDBK
217F 751,000h 760,000h 698,000h At 24V, 3.8A and 40°C; Ground Benign GB40
1,085,000h 1,099,000h 1,018,000h At 24V, 3.8A and 25°C; Ground Benign GB25
219,000h 224,000h 220,000h At 24V, 3.8A and 40°C; Ground Fixed GF40
288,000h 294,000h 293,000h At 24V, 3.8A and 25°C; Ground Fixed GF25