9
UK
In case of operation as 3-wire unit only A2 must be used as output
(OSSD). Otherwise the safety function of the sensor will be impaired or
prevented.
► Connect output A1 to supply voltage�
► Make absolutely sure to exclude cross faults and short circuits between the
supply voltage and output A2 by means of appropriate installation!
The indicated values regarding the safety function (→ 10 Technical data) remain
unchanged�
8 Operation
8.1 Switching status of the outputs
8.1.1 The safe state
The safe state is when at least one of the outputs A1 and A2 (OSSD) is switched
off (zero-current state: logic "0")�
If one of the outputs A1 and A2 is switched off, the subsequent safety-related logic
unit must bring the complete system into the state defined as safe�
8.1.2 The switched state
If the damping element is in the enable zone and if there is no sensor error, both
outputs A1 and A2 (OSSD) are enabled (logic "1")�
8.1.3 Output data
The output data are based on the input data to EN 61131-2 type 1 or 2:
logic "1"
≥ 15 V
2���15 mA
≥ 11 V
15���30 mA
logic "0"
≤ 5 V
leakage current 0�2 mA
8.1.4 Cross faults
• A cross fault between both outputs (A1 and A2) is detected by the fail-safe
sensor and leads to switching off the outputs (OSSD) at the next safety
request� The outputs A1 and A2 remain switched off until the error has been
removed�
• A cross fault between one of the two outputs (A1 or A2) and the supply voltage
leads to switching off the other output (A2 or A1) in case of a safety request�
