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Unformatted text preview: sensor designs are used, where the black connection
is not, as in the case of standard sensors, for the output of the switching signal, but
in this case for receiving the testing clock. The sensors are supplied with voltage by
the function monitor via the brown connections. The blue connections serve as the
outputs of the sensors to the function monitor.
The sensors are continually reprogrammed from normally open to normally closed
function in accordance with the rhythm of the clock frequency. The pulses from the
pulse line (BK) and the signal line (BU) are connected in the function monitor in such
a way that the clock pulses are filtered out logically and the appropriate switching
status of the sensors is available at the signal outputs.
The fault-free status is signalled via a positive output signal on a common error
message output. In the case of a fault, e.g. line break, short circuit or damage to a
sensor, the error message output and the signal output of the sensor concerned are
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- Spring '12