Patent ID: 7089098

Claim:
An industrial truck having a first and a second controller ( 10 , 18 ) each of which has a device for a self-diagnosis ( 16 , 30 ) of sensors ( 12 , 20 ) and actuators ( 14 , 22 ) of the controller, the second controller being provided with a first, a second, and a third interface ( 27 , 29 , 32 ) said industrial truck comprising: a first and a second data line ( 26 , 28 ) between the first and the second controller, the first data line ( 26 ) opens into said first interface ( 27 ) of said second controller, the second data line opens into said second interface ( 29 ) of said second controller designed as a rapid-action bus system, wherein the first data line is provided for diagnostic and control commands and the second data line is provided for operating data of the vehicle, wherein both controllers use a different protocol for its diagnostic data, and the second controller comprises a translation device to which the diagnostic data of the first controller via the first interface ( 27 ) are applied, said translation device translates the diagnostic data of the first controller into the protocol of the second controller and applies the translated data to said third interface ( 32 ) of the second controller, the diagnostic data of a self-diagnosis of the second controller are also applied to said third interface ( 32 ), and the third interface ( 32 ) is provided to be connected to a separate diagnostic apparatus reading diagnostic data from the first and the second controllers according to the protocol of the second controller.