Electrical installation
Control terminals
Safe torque off
5
113
EDKCSEX064 DE/EN/FR 6.0
5.3.3 Safe torque off
The axis modules support the "safe torque off" safety function (formerly "safe
standstill"), "protection against unexpected start−up", in accordance with the
requirements of EN ISO 13849−1, Performance Level Pld. For this purpose, the
axis modules are equipped with two independent safety paths. The
Performance Level Pld is obtained if the output signal is additionally checked
with regard to correctness at X6/SO.
5.3.3.1 Implementation
In the axis module, the "safe torque off" connection is implemented with
optocouplers. The optocouplers isolate the following areas electrically from
each other:
ƒ The digital inputs and outputs:
– input X6/SI1 (controller enable/inhibit)
– input X6/SI2 (pulse enable/inhibit)
– brake output X6/B+, B−
– output X6/SO ("safe torque off" active/inactive)
ƒ The circuit for the internal control
ƒ The final power stage
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