| 摘要 |
<p>The present invention relates to a safety device comprising a safety module (11), a data bus (12) and one or several transmitters (15, 16, 17, 18, 19, 20). The safety module transmits a pulse train (one dynamic signal) over said bus (12) constituting a loop, whereby the pulse train is connected to each of said transmitters, wherein the pulse is phase inverted.</p> |
