4. Functional safety engineering
Festo.P.BE-CMMS-ST-G2-HW-EN 1008NH 81
Safety function as per
EN 61800-5-2
PILZ* component Switch-off behaviour Stop category as
per
EN 60204-1
STO Safe torque off PNOZ X2P
(Relay outputs forced:
– 2 safety contacts no
delay
Connection options for:
– EMERGENCY OFF
pushbuttons
– Protective door limit
switches
– Start button)
0
SS1 Safe Stop 1 PNOZ XV2P
(Relay outputs forced:
– 2 safety contacts no
delay
– 2 safety contacts
relapse delayed
Connection options
identical to X2P;
Fixed or adjustable
relapse delay;
Cancelling the time delay
via Reset button)
1
*or comparable safety switch device with corresponding safety contacts
Table 4.2 Overview of the safety function in accordance with EN 61800-5-2
An overview of the various stop categories is provided by the Table
4.3.
Stop category Type Handling
0 Uncontrolled shutdown through
immediate switching off of the energy.
EMERGENCY OFF or EMERGENCY STOP
1 Controlled shutdown through switching
off of the energy when a standstill has
been reached.
EMERGENCY STOP
2 Controlled shutdown without switching
off the energy in standstill.
Not suitable for EMERGENCY OFF or
EMERGENCY STOP
Table 4.3 Stop categories
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