MANUGENX5 - Version 1.01 24.03.2021
© 2021 0N3 s.r.l. - Subject to change without notice
23
4 Safety specifications
4.1
Safety parameters
4.1.1
General Safety parameters
The following general parameters have been considered for the PFHd evaluation:
Part
Mean number of
annual operations
Working days
per year
Working hours
per day
Working hours
per year
Resulting cycle
period
Emergency Stop
Push Button
48,000 cycles / year
240
16
3840
1.152s = 19.2min
Enabling Device
Push Button
12,000 cycles / year
240
16
3840
288s = 4.8min
State Selector
switch
1,920 cycles / year
240
16
3840
7200s = 120min
!
DANGER!
• The number of mean annual operations indicated in the previous table cannot be exceeded because
the declared PFHd is guaranteed only if this number is respected.
4.1.2
Safety functions parameters
The following parameters apply:
Safety function
Safety function
mode
SIL
(IEC 61508)
PFHd
(IEC 61508)
Performance level
(EN 13849-1)
Safe Stop
High demand or
continuous mode
SIL3
6*10
-8
1/h
PLd, Cat.3
Enabling Device
Push Button
High demand or
continuous mode
SIL3
6*10
-8
1/h
PLd, Cat.3
Selector
switch
High demand or
continuous mode
SIL1
1.5*10
-6
1/h
PL=b, Cat.B
Maximum reaction time for all three safety functions is 350ms. Reaction time is measured between the following events:
•
ES and ED functions => from push button change of state to new stable relay contact state
•
SS function => from state selector switch change of state to new stable output driver state
