MSA SUPREMATouch MCP 20, Operating Manual, Page: 103 / 241

103
Special conditions to comply with the requirements of DIN EN 61508 for SIL 1-3 according to TÜV
GB
SUPREMATouch
9.2 Additional conditions to fulfill the requirements of IEC 61508 for a certain SIL
In addition to the general conditions the following criteria must be met for a specific SIL:
SIL 1:
The installation must be carried out in accordance with configuration 1 in chapter 9.4 "Configura-
tions".
SIL 2:
The installation must be carried out in accordance with configuration 2 in chapter 9.4 "Configura-
tions".
For configuration 2 when using the MRO8 and/or MRO8 TS modules the contacts of the relays for
the same alarm (Alarm A and Alarm B) of subsystem A and B have to be interconnected serially
or processed safety-related.
(By using the MRO16 TS modules this interconnecting is already internally realized.)
SIL 3:
The installation has to be carried out in accordance with configuration 3 in chapter 9.4 "Configu-
rations".
Two independent sensors have to be used in the same area. The sensors in the same area have
to be connected to different MAI20 (analogue input) modules.
For configuration 3 when using the MRO8 and/or MRO8 TS modules the contacts of the relays for
the same alarm (Alarm A and Alarm B) of subsystem A and B have to be interconnected serially
or processed safety-related.
(By using the MRO16 TS modules this interconnecting is already internally realized.)
9.3 Possible Configurations and Acquirable SILs
The following table shows which configuration has to be selected to fulfill the requirements of a
special SIL.
(LDM = Low Demand Mode; HDM = High Demand or Continuous Mode)
Depending on the selected configuration the following safety-relevant parameters have to be
considered while implementing the safety loop:
Safety-relevant parameters without using the MLE10 Modules
SIL 1 SIL 2 SIL 3
LDM HDM LDM HDM LDM HDM
Configuration 1 X X X
Configuration 2 X X X
Configuration 3 X X X X X X
PFH PFD SFF λ
DU
λ
DD
HFT
Configuration 1 3.8*10
-7
(4 % of SIL1)
< 2*10
-3
(2.1% of SIL1)
97 % 393 fit 4555 fit 0
Configuration 2 2.5*10-8 (3 % of SIL2)
1.3*10
-4
(1.3% of SIL2)
97 % 393 fit 4555 fit 1
1
Configuration 3 8.2*10-9 (8 % of SIL3)
4.0*10
-5
(4.0% of SIL3)
97 % 393 fit 4555 fit 1