| 摘要 |
<p>The invention relates to a method for distributing event-triggered (ET) and time-triggered (TT) messages in a distributed real-time system by means of a distributor unit that comprises a low-level relay unit (LLVME) and a high-level relay unit (HLVME), wherein communication ports of the distributor unit to other relay units and/or end systems of the real-time systems are attached to the LLVME. The invention further relates to such a distributor unit and to a real-time system comprising such a distributor unit. According to the invention, the LLVME has access to a global time base and is configured to differentiate between ET messages and TT messages, wherein the LLVME forwards an ET message that is incoming at one of its ports to the HLVME such that the HLVME can carry out the analysis and temporal scheduling of said ET message before it delivers this ET message back to the LLVME for issue at the designated output ports of the LLVME, and, prior to the known issuing of a TT message, the LLVME transmits a pause frame to the HLVME such that no ET message is scheduled to be transmitted by the HLVME during this anticipated and scheduled TT message transmission slot, and wherein the LLVME delivers an incoming TT message directly for issue at the designated output ports in accordance with the known time plan.</p> |
