94 Rockwell Automation Publication 440R-UM013E-EN-P - March 2017
Appendix B Regulatory Approvals
The performance of the safety function is dependent on the structure of all
devices that comprise the safety function. Table 27
and Table 28 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 six 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 27 in accordance with
IEC/EN 61508 and IEC 62061.
Table 27 - SIL Rating
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 28 - Performance Level/Category
440R-S13R2
(CI)
440R-D22R2
(DI)
440R-D22S2
(DIS)
440R-EM4R2
(EM)
440R-EM4R2D
(EMD)
440R-S12R2
(SI)
PFH (1/h) 4.26 E-09 4.35 E-09 4.39 E-09 1.81 E-09 4.40 E-09 3.98 E-09
Safety Integrity Level Claim Limit 3
Mode of Operation High demand
Hardware Fault Tolerance 1
Safe Failure Fraction 99%
440R-S13R2
(CI)
440R-D22R2
(DI)
440R-D22S2
(DIS)
440R-EM4R2
(EM)
440R-EM4R2D
(EMD)
440R-S12R2
(SI)
MTTFd 164 355 484 190 165 262
Category Up to 4
Performance Level Up to e
DC avg 99%
Mission Time 20 years
Days of Operation 365 days
Hours of Operation 24 hr
T cycle 8 hr / 8.28 s
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