A shared memory for sharing data between external terminals such as a PC or a server has a restriction on the starting order of an external terminal, and when a shared memory is realized by an Ethernet connection, the time of access to the shared memory or the time of data updating is not guaranteed A shared memory network is required.A shared memory 6 is mounted on a TSN switch 4 capable of being connected to a TSN network in which access time is guaranteed. As a result, the access to the shared memory 6 and the time of data updating are ensured, and the security function is secured by the filtering function, and the shared memory 6 of the Ethernet (registered trademark) connection having no restriction of the starting order of the external terminal 11 can be realized.Diagram
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