| 摘要 |
An interface module (200,300) comprises a field bus interface (231,331) and one or more communication interfaces (261,361) for connecting said interface module (200,300) to a respective communication interface (211B;311B;212B,213B,214B) of at least two switching devices (211;311;212,213,214), said interface module (200,300) being adapted to transmit a collective status or error message to said field bus interface (231,331) in response to receiving a status or an error message from any one of said communication interfaces (261,361).
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