82 Rockwell Automation Publication 440R-UM013G-EN-P - December 2022
Appendix B Regulatory Approvals
Machine Safety Directive
The performance of the safety function is dependent on the structure of all devices that
comprise the safety function. Table 20 and Table 21 provide the data that must be used to
represent safety relays when calculating the safety integrity level (SIL) or the Performance
Level (PL).
Safety relays can be used in safety circuits according to DIN EN 60204-1/VDE 0113 part 1. The
following safety requirements are achievable in maximum based on the operation mode and
wiring.
Specifications are applicable only if the safety function is demanded at least once within 6
months. All diagnostic tests are conducted at least before next demand. At mission time (TM),
the proof test interval (PTI) is assumed. Components failure rates are according to SN29500.
SIL Rating
Safety relays meet the requirements in Table 20 in accordance with IEC/EN 61508 and can be
used in applications up to SIL 3 according to IEC 62061.
Performance Level/Category
Safety relays can be used in safety systems that meet up to Category 4 and Performance Level
PLe in accordance with ISO 13849-1.
Table 20 - SIL Rating
Attribute
440R-S13R2
(CI)
440R-D22R2
(DI)
440R-D22S2
(DIS)
440R-EM4R2
(EM)
440R-EM4R2D
(EMD)
440R-S12R2
(SI)
PFH (1/h) 4.42 E-09 4.52 E-09 4.42 E-09 1.54 E-09 4.58 E-09 4.28 E-09
Safety integrity level 3
Mode of operation High demand
Hardware fault
tolerance
1
Safe failure fraction 99%
Table 21 - Performance Level/Category
Attribute
440R-S13R2
(CI)
440R-D22R2
(DI)
440R-D22S2
(DIS)
440R-EM4R2
(EM)
440R-EM4R2D
(EMD)
440R-S12R2
(SI)
MTTFd 252 230 439 342 256 363
Category Up to 4
Performance Level Up to e
DC avg 98.8%
Mission time [year] 20
Days of operation 365
Hours of operation 24
T cycle 8 hr/8.28 s
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