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Wireless monitoring system

The present invention relates to a system for monitoring movable protection devices of machines or plants, comprising a safety switch and a remotely located relative to the safety switch safety evaluation unit (8), wherein the security switch and the safety evaluation unit (8) for transmitting data (14) and operating power (13) are formed between the safety switch and of the safety evaluation unit (8), wherein the safety switch an operating power of the safety switch only from the safety evaluation unit (8) is referring. In order to provide a system of the aforementioned kind which is of simple construction and reliable, the present invention proposes that a transfer of data (14) and operating power (13) (8) between the safety switch and the safety evaluation unit wirelessly only erfolgend.