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The STO safety function can also be requested through active, fail-safe outputs of a PLC or with contacts as in Chap-
ter9.6.1 Passive circuit X41, Page 19, but with an external power supply. For an external power supply, only PELV power
circuits and PELV power sources may be used. The voltage source must provide a nominal voltage of 24 VDC (an abso-
lute minimum output voltage of 22 VDC) with at least 0.5 A.
9.6.3 Shut down of STO safety function X41
Fig. 9-3:
If the STO safety function is not required in a controller, the function can also be deactivated by means of jumpers in a
connector as shown in the circuit diagram Fig. 9-3:.
Caution
Never temporarily use the connections shown here for another system whose risk assessment re-
quires an STO safety function.
The risk of forgetting is given.
9.6.4 Connection X42
Fig. 9-4:
The connection to X42 at the last controller in a system is only required if the feedback contact FB is evaluated. Otherwise,
the X42 interface can also remain open. For termination - which means closing the feedback path - use termination con-
nector 961893PT.
10 Operation and use
10.1 Obligation of the operator
Check the functioning of the safety device at defined time
intervals. It is the responsibility of the operator to choose
the type of test and the time intervals during the required
time period. The test shall be carried out in such a way that
the proper functioning of the safety device is demonstrated
in the interaction with all the associated components. The
maximum interval between two tests may not exceed a
duration of T
, see 4 Technical Specifications, Page 10.
PTI
20
10.2 Overvoltage and polarity reversal
protection
The control inputs STO-A and STO-B are protected against
overvoltages and against the polarity reversal of the control
voltage, see also Chapter4 Technical Specifications,
Page 10.
The 24 VDC auxiliary voltage supplied at X41 is short-cir-
cuit proof. However, a short circuit or overload leads to the
failure of alll the internal logic voltages and thus to the fail-
ure of the primary function.
P2552HW | 2021-04
Apex Tool Group
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