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36
Safety Time Control Device SCB
19. Safety parameters
Calculation of characteristic values for the relay contacts under the following assumptions:
DC-13; DC 24 V
Load per contact
-
≤
1 A
≤
2 A
T
M
[Year]
-
20
20
n
op
[Max. cycles per year]
-
≤
100,000
≤
10,000
Load per contact
≤
0.5 A
≤
1 A
≤
2 A
T
M
[Year]
20
20
20
n
op
[Max. cycles per year]
≤
65,000
≤
20,000
≤
5,000
AC-15; AC 250 V
Application
Output
Contact
EN ISO 13849-1
IEC 62061 / IEC 61508
PL
Category PFH
d
[1/h]
SIL
PFD
AVG
PFH [1/h]
Single channel E-Stop
(Fig. 10)
Semiconductor
c
1
1.14E-06
1
1.22E-04
1.39E-09
Relay
c
1
1.14E-06
1
7.78E-04
8.88E-09
Dual channel E-Stop
without cross-circuit moni-
toring (Fig. 9)
Semiconductor
d
3
1.03E-07
2
2.26E-05
2.58E-10
Relay
d
3
1.03E-07
2
3.65E-05
4.21E-10
Dual channel E-Stop with
cross-circuit monitoring
(Fig. 8, 11, 12)
Semiconductor
e
4
7.04E-09
3
2.23E05
2.55E-10
Relay
e
4
2.47E-08
3
3.62E-05
4.18E-10
Safety parameters according to EN ISO 13849-1, IEC 62061 und IEC 61508
ATTENTION!
According to CNB/M/11.050, a request for the safety function is recommended at the following
intervals:
•
Once a month for applications up to PL e with Cat. 3 respectively Cat. 4 or SIL 3 with HFT = 1
•
Once a year for applications up to PL d with Cat. 3 or SIL 2 with HFT = 1
Safety parameters for use in furnaces in continous mode accorting to EN 50156-1 und EN 746-2
Application
Output
Contact
IEC 62061 / IEC 61508
SIL
PFD
avg
PFH [1/h]
T
M
[Jahr] PTI [Jahr]
Single channel E-Stop (Fig. 10)
Semiconductor
1
1.22E-04
1.39E-09
20
20
Relay
1
1.65E-04
1.89E-09
20
20
Dual channel E-Stop without cross-
circuit monitoring (Fig. 9)
Semiconductor
2
2.26E-05
2.58E-10
20
20
Relay
2
2.35E-05
2.68E-10
20
20
Dual channel E-Stop with cross-circuit
monitoring (Fig. 8, 11, 12)
Semiconductor
3
2.23E-05
2.55E-10
20
20
Relay
3
2.32E-05
2.65E-10
20
20
