Safety engineering
Safety functions
General information
40
EDS94AYAF EN 1.0
1.3
Safety functions
Detailed information on the safety functions and parameterisation can be found in the
software manual and online help for the safety module.
The following information is intended for a basic orientation.
1.3.1
General information
1.3.1.1
Stop functions
The stop functions are distinguished according to the cause of release:
ƒ
Standard stop (simple stop)
– Release by a safe input with the parameterised STO, SS1 or SS2 functions
– Release by activating the bits STO, SS1 or SS2 bits via the safety bus.
– In special operation the standard stop can be avoided by using the enable switch.
ƒ
Emergency stop
– Release by a safe input with the parameterised "Safe stop emergency" (SSE)
function.
– Release by activating the SSE bit via the safety bus.
– STO or SS1 can be set as emergency stop function to be executed.
– In special operation, the emergency stop
cannot
be avoided.
ƒ
Error stop
– Release as response to an error.
– In special operation, the error stop
cannot
be avoided.
1.3.1.2
Priorisation
Stop functions with priority influence the sequence of subordinated functions already
started.
ƒ
STO
The STO function has the highest priority over all other functions. Functions already
started (e.g. SS1 or SS2) are aborted and the drive is switched off.
ƒ
SS1
The SS1 function has priority over SS2. Considering the set stopping time for SS1 and
SS2 (C15305) and the SS1 mode (C15306), the drive is switched to torque−free
operation.
ƒ
Monitoring functions
The monitoring functions have equivalent priorities. They can be executed at the same
time.