1. A method for establishing communication schedules for a distributed real-time computer system comprising nodal computers, comprising the steps of: a) creating a grid (RAS) which contains all of the parameters necessary to enable basic communication between nodes (KR 1. .. KR 5 ) of a cluster (CLU), characterized in that b) deriving nodal communication schedules (KPG; KP 1 , KP 2 ) for all nodes planned to be used as invariant components (KR 2 ; KR 2 , KR 3 ) from said grid (RAS) and all parameters of the grid are copied and node-specific parameters are added, and c) deriving cluster communication schedules (CP 1 , CP 2 ; CL 1 , CL 2 ) from said nodal communication schedules (KPG; KP 1 , KP 2 ), which contain, in addition to all parameters of the grid and the node-specific parameters of the invariant components, those parameters which are relevant to the remaining nodes of the cluster.