Beckhoff AX8911, Документация

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Product description
AX8911 10 Version: 1.2.0
4 Product description
4.1 General description
AX8911 - TwinSAFE Drive Option for AX8000 Servo Drives
The AX8911 TwinSAFE Drive Option is an optional extension of the Beckhoff AX8000 Servo Drive series.
The AX8911 is intended for use in a servo drive from the AX8000 series, in which it is permanently installed.
There are 2 versions of the AX8911 option.
AX8xxx-x1xx axis module
The variant in the AX8xxx-x1xx axis module only provides the safety function STO (Safe Torque Off) or SS1
(Safe Stop 1) via the digital inputs of the AX8000 axis module or via a TwinSAFE (FSoE) connection.
AX8xxx-x2xx axis module
The variant in the AX8xxx-x2xx axis module also provides SafeMotion functions such as Safe Limited Speed
in addition to STO and SS1.
Attainable safety level
For the safety functions STO, SS1 and SBC (AX8xxx-x2xx), the AX8911 meets the requirements of
IEC 61508:2010 SIL 3, EN 62061:2005/A1:2013/A2:2015 SILCL3 and EN ISO 13849-1:2015 (Cat 4, PL e).
For the Safe Motion safety functions (all except STO, SS1 und SBC), the subsystem consisting of AX8911
and SICK EDS35/EDM35 OCT encoder meets the requirements of IEC 61508:2010 up to SIL 2,
EN 62061:2005/A1:2013/A2:2015 up to SILCL2 and EN ISO 13849-1:2015 up to Cat. 3, PL d.
If a higher safety level is required for the SafeMotion safety functions, a further, more diverse encoder signal
must be used together with the EDS35/EDM35 OCT encoder. This can be done, for example, by attaching
and using a second encoder.
CAUTION
Higher Performance Level for SafeMotion functions
The machine manufacturer or user is solely responsible for the execution and evaluation of the measures to
attain a higher Performance Level.
4.1.1 AX8911 with STO function (AX8xxx-x1xx)
Through the integration of the AX8911 Drive Option in the AX8000, the STO safety function can be enabled
via two digital inputs per channel of the servo drive or via Safety-over-EtherCAT (FSoE). The digital inputs
and the signals via FSoE are equivalent and are logically ORed internally. It is therefore sufficient to enable
the axis via either one of the two ways.
The respective axis is enabled if both of its digital inputs are logic 1 (24V
DC
). If at least one of the two digital
inputs is logic 0, then the STO safety function is active and the motor is switched torque-free.
Alternatively, the STO function of the axis can be accessed via Safety-over-EtherCAT (FSoE). The
respective axis is enabled if the STO signal via FSoE is logic 1. If the STO signal via FSoE is logic 0, the
STO safety function is active and the motor is switched torque-free.
The AX8911 Drive Option is typically addressed via FSoE. The digital inputs are intended for the
commissioning of the AX8000. It is also possible via the digital inputs to operate the AX8911 Drive Option
with a safety controller that doesn't support the FSoE protocol.