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Safety system

  • US 9,645,555 B2
  • Filed: 10/04/2013
  • Issued: 05/09/2017
  • Est. Priority Date: 10/10/2012
  • Status: Active Grant
First Claim
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1. A safety system comprisinga safety unit (10);

  • at least one safety related participant (22) which comprises a protective device (24) and a first interruptible signal transmission path and a second interruptible signal transmission path which can be interrupted together on the occurrence of a non-secure state of the protective device (24); and

    at least one test signal path (36) which starting from an output (X1) of the safety unit (10) runs through the at least one safety related participant (22) to a safety input (I1) of the safety unit (10) and which comprises at least one of the first and the second interruptible signal transmission paths,whereinthe safety related participant (22) comprises an interruption switch (66) arranged in the test signal path (36) and an evaluation unit (50) which is connected to the first signal transmission path and/or to a first switching signal output of the protective device (24) controlling the interruption of the first signal transmission path, which evaluation unit is connected to the second signal transmission path and/or to a second switching signal output of the protective device (24) controlling the interruption of the first signal transmission path and which evaluation unit is configured to check whether the first and the second signal transmission path together are interrupted or are controlled for interruption and to open the interruption switch (66) when the first and the second interruptible signal transmission paths together are not interrupted or controlled for interruption;

    the safety related participant (22) comprises an interconnection module (26) connected to the protective device (24) of the safety related participant via which interconnection module the safety related participant (22) is integrated in the safety system;

    the first and/or the second interruptible signal transmission path of the safety related participant (22) comprise(s) a switch (96a, 96b) arranged in the protective device (24) which switch is integrated in the test signal path (26) via a forward line (98a, 98b) and a return line (100a, 100b), wherein the forward line (98a, 98b) and the return line (100a, 100b) are arranged in an interconnection line (28) connecting the protective device (24) and the interconnection module (26); and

    /or whereinthe first and/or the second interruptible signal transmission paths of the safety related participant (22) comprise(s) a switch (105a, 105b) arranged in the interconnection module (26) which switch is connected to the switching signal output of the protective device (24) controlling the interruption of the switch (105a, 105b) via a switching signal line, wherein the switching signal line is arranged in an interconnection line (28) connecting the protective device (24) and the interconnection module (26).

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