Configurable diagnosis unit for a variable-speed electrical power drive system configured to be suitable for use in safety-related applications, - wherein the diagnosis unit has at least two signal inputs, wherein the respective input signals of each signal input contain both at least one piece of status information and at least one piece of configuration information, - wherein the diagnosis unit has a diagnosis module configured to be suitable in such a way that it logically checks the status information of the input signals of the signal inputs and monitors the behaviour thereof over time and has two or more independent function blocks that are active such that said function blocks determine parameters monitored by the diagnosis module, - wherein the diagnosis unit has a configuration module which is configured to be suitable in such a way that it evaluates the configuration information of the input signals of the signal inputs and selects the active function blocks of the diagnosis module depending on the associated evaluation result, - wherein the diagnosis unit has a plurality of output modules, wherein each output module links a logical output status of the diagnosis module to the input signals of the signal inputs and generates at least one output signal therefrom, wherein each output module is configured to be suitable in such a way that a change in the status information in a particular input signal of a particular signal input leads to a change in the logical output status of the particular output module, wherein the configuration module is configured to be suitable in such a way that a change in the configuration information in the particular input signal of a particular signal input leads to a change, adapted to said change, in the relevant selection of the active function blocks, wherein unselected function blocks of the diagnosis module are switched off in particular to save energy, wherein a change in the configuration information in the input signal of the particular signal input leads to a change, adapted to said change, in the monitored parameters through the selection of the active function blocks by the diagnosis module, wherein a function block configured as a reporting block collects status information on the other function blocks (5a, 5b, 5c and 5d) and provides said information to a safety shutdown device and to a signal electronics by means of one of the output modules, in particular by means of an output signal regarding the status feedback of the diagnosis unit. - wherein the diagnosis unit has at least two signal inputs, wherein the respective input signals of each signal input contain both at least one piece of status information and at least one piece of configuration information, - wherein the diagnosis unit has a diagnosis module configured to be suitable in such a way that it logically checks the status information of the input signals of the signal inputs and monitors the behaviour thereof over time and has two or more independent function blocks that are active such that said function blocks determine parameters monitored by the diagnosis module, - wherein the diagnosis unit has a configuration module which is configured to be suitable in such a way that it evaluates the configuration information of the input signals of the signal inputs and selects the active function blocks of the diagnosis module depending on the associated evaluation result, - wherein the diagnosis unit has a plurality of output modules, wherein each output module links a logical output status of the diagnosis module to the input signals of the signal inputs and generates at least one output signal therefrom,