| 摘要 |
In order to monitor two clock signals in a manner which is reliable in terms of signal technology against one of them remaining off or drifting away etc., for example in areas of stringent safety requirements, it is proposed that the clock signals (clock 1, clock 2) be offset in time with respect to one another and trigger associated monostable multivibrators (MF1, MF2). The monostable multivibrators (MF1, MF2) generate imaging signals (e1, e2) of defined pulse length which are applied to a non-equivalence comparator (1) which is reliable in signal technology terms and supplies an output signal (AV) which is monitored by a downstream-connected RS memory (2) which is reliable in signal technology terms. The output of said RS memory (2) is connected via amplification means (3, 4), which are reliable in signal technology terms, to a switching element (5) which influences an energy flow or signal flow and is reliable in signal technology terms. In a further embodiment, the clock signals (clock 1, clock 2) are offset equidistantly in time in error-free operation, the imaging signals (e1, e2) of the monostable multivibrators (MF1, MF2) which are triggered by the rising edges of the clock signals (clock 1, clock 2) being at the same interval and having the same pulse length. <IMAGE>
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