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Appendix C
Regulatory Approvals
DG Safety Relay Ratings
118
SIL Rating
The DG safety relay meets the requirements of SIL in accordance with IEC/
EN 61508 and SIL CL 3 in accordance with IEC/EN 62061.
Table 49 - SIL Ratings
Attribute
Safety integrity level
Safety integrity level claim limit [SILCL]
PFH
[1/h]
d
Mode of operation
Safety-related subsystems
Hardware fault tolerance
Proof test interval, max [a]
Safe failure fraction [%]
Diagnostic coverage [%]
Performance Level/Category
The Performance Level of the safety function is dependent on the structure of
all devices that comprise the safety function.
The DG safety relay is capable of being used in safety systems meeting up to
Category 4 and Performance Level PLe in accordance with ISO 13849-1.
Table 50 - DG Performance Level Ratings
Attribute
Category
Performance Level
MTTF
[a]
d
DC
[%]
avg
SFF [%]
CCF
Rockwell Automation Publication 440R-UM015C-EN-P - April 2018
440R-DG2R2T
3
3
-8
1.92 x 10
High-demand mode
Type B (use of programmable / complex components)
HFT = 1 (dual channel system)
HFT = 0 (single channel system)
20
98.9
97.12
440R-DG2R2T
Up to 4
Up to e
92.2
97.31
99.06
80
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