MTBF

MTBF stands for Mean Time Between Failure, 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 (Mean Time To Failure) is identical to the MTBF value.

The redundancy module has two input channels that are fully independent of each other. Each control loop, each auxiliary voltage source or other circuits in the module are designed separately for each input. The redundancy module with two inputs can be regarded as two separate redundancy modules combined in one housing. The only common point is the track that connects the two separate circuits with each other at the output.

The following MTBF numbers refer to the complete dual input module. If the MTBF number is only required by one path, you simple double the value from the table.

Input/output current conditions

Input:
2x 5 A

Output: 10A

Input:
2x 10 A

Output: 20A

 

MTBF

SN 29500,
IEC 61709

10,050,000h

7,895,000h

At 24 V and +40 °C

16,777,000h

13,403,000h

At 24 V and +25 °C

MTBF

MIL HDBK 217F

2,030,000h

1,890,000h

At 24 V, +40 °C
Ground Fixed GF40

2,801,000 h

2,588,000 h

At 24 V, +25 °C
Ground Fixed GF25

441,000h

404,000h

At 24 V, +40 °C,
Ground Benign GB40

604,000h

548,000h

At 24 V, +25 °C,
Ground Benign GB25