Выражение встречается в следующем контексте:
F402 DOUBLE MDT FAILURE SHUTDOWN
The master data telegram used for internal communications (MDT) between both controllers has not been received in the drive over the course of two sequential fieldbus cycles.
Cause:
1.There is interference in the internal communications between the two controllers.
2.The fieldbus master is no longer cyclically sending telegrams to the
drive. They are, however, being cyclilcally expected in phase 4.
Recovery:
1.Replace interface module (e.g., PBK, CAN, ... ) in the drive.
2.Switch master on and initiate cyclilcal communications. See Control Manual.

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