Beckhoff AX8911, Документация

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Safe Motion functions
AX8911 49 Version: 1.2.0
7.5 Safety function STO
For the use of the safety function STO (Safe Torque Off), see chapter Use of the STO function [
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29] .
7.6 Safety function SS1
AX8911 in AX8xxx-x1xx
The function SS1 (Safe Stop 1) is supported by a user-specific safety program on the AX8911 by
implementing a time delay of the STO signal. Alternatively, the time delay of the STO signal can be
implemented in the higher-level safety controller.
This corresponds to the safety function SS1-t (safe stop 1 time controlled) according to EN 61800-5-2:2017.
AX8911 in AX8xxx-x2xx
Safe Motion functions are available in the AX8xxx-x2xx, so that the stopping of the drive can be monitored.
To do this, the STO Signal is transferred to the FB Envelope, for example via an ESTOP FB. The time delay
of the input signal
SafeFunction is implemented in the Envelope function block. The function block receives
the safe speed as a further input and calculates the envelope at the time of the falling edge at the input
SafeFunction . If this envelope is violated by the actual speed, the output SafeFunctionOut is set immediately
to FALSE and the Error output of the FB to TRUE.
If the envelope is not violated, the switch-off takes place after reaching the defined minimum speed and after
the
Time after in target (ms) , but at the latest after reaching MaxTime(ms) .
This corresponds to the safety function SS1-r (safe stop 1 ramp monitored) according to EN 61800-5-2:2017.
Fig. 21: SS1 with Envelope FB
7.7 Safety functions SOS, SS2
The safety function SOS (Safe Operating Stop) or SS2 (Safe Stop 2) can be implemented in different ways.
On account of the use of the FB Envelope, the safety function SS2 described here corresponds to the safety
function SS2-r (safe stop 2 ramp monitored) according to EN 61800-5-2:2017.