Safety engineering
Safety functions
Cascading
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EDS94AYAE EN 6.0
1.3.13 Cascading
1.3.13.1 Description
Cascading / CAS
This function enables a synchronised shutdown of an entire drive system.
ƒ The function can only be activated via parameter setting. For this purpose set the
"CAS: cascading" parameter to "Cascading with SD−In4".
ƒ With activated function:
– The SD−In4 safe input is used as cascading input and cannot be used as universal
input anymore.
– The SD−Out1 safe output is used as cascading output and cannot be parameterised
as universal feedback output anymore.
– A stop function (emergency stop, SSE) released by cascading cannot be overruled
in special operation through the enable switch.
ƒ The cascade trips with every STO, irrespective of which safety module adopts the
STO status and for which reason.
ƒ All safety modules of the cascade can only be enabled if all cascading inputs (SD−In4)
are in the OFF state (emergency stop has been enabled).
ƒ For the restart of the drive system, the AIS restart acknowledgement must be
executed simultaneously for all safety modules of the cascade.
ƒ The restart is executed with a delay of 100 ms after the acknowledgement has been
recognised.
ƒ Cascading is designed for max. 100 drives.
ƒ During special operation, the drives of the cascade can only change from the
SS2/SOS stop function to acceptance. An STO or SS1 as stop function would trigger
the entire drive system every time and thus impede acceptance.
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