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STO, no safety card
| Device S701-724 | Operation mode | EN 13849-1 | EN 62061 | PFHD (1/h) | TM (Years) |
|---|---|---|---|---|---|
| STO1/2-Enable | single channel | PLd, Cat.3 | SIL CL2 | 7.05E-08 | 20 |
| STO1-Enable+STO2-Enable | dual channel | PLd, Cat.3 | SIL CL2 | 7.05E-08 | 20 |
| STO1-Enable+STO2-Enable+STO-Status | dual channel with periodic test | PLe, Cat.4 | SIL CL3 | 1.04E-09 | 20 |
With safety card S1-2/S2-2 and motor feedback
Motor feedback with unknown MTTF value
MTTF = 10 must be used in this case (according to the graduated process for estimation of MTTF in EN 13849-1:2008 chapt. 4.5.2). The motor encoder is already included in the characteristic data, so no further calculations need to be performed for the "Safe Actuator" subsystem. The subsystem is built from S700, safety card and motor feedback.
| Device (feedback with unknown MTTF) | EN 13849-1 | EN 62061 | PFHD (1/h) | TM (Years) |
|---|---|---|---|---|
| S700 with Safety card S1/S1-2 and unknown motor feedback | PL d, Cat.3 | SIL CL 2 | 1.26E-07* | 20 |
| S700 with Safety card S2/S2-2 and unknown motor feedback | PL d, Cat.3 | SIL CL 2 | 1.35E-07* | 20 |
* = depends on the MTTF value of the used feedback. The higher MTTF the smaller is PFHD . This has an influence to the complete system, even if PL and SIL classes don't change.
Motor feedback with MTTF value larger than 57
Most of the feedback systems, especially resolvers, have MTTF values larger than 57. The motor encoder is already included in the characteristic data, so no further calculations need to be performed for the "Safe Actuator" subsystem. The subsystem is built from S700, safety card and motor feedback.
| Device (feedback with MTTF > 57) | EN 13849-1 | EN 62061 | PFHD (1/h) | TM (Years) |
|---|---|---|---|---|
| S700 with Safety card S1/S1-2 and Kollmorgen motor feedback | PL e, Cat.4 | SIL CL 3 | 2.37E-08* | 20 |
| S700 with Safety card S2/S2-2 and Kollmorgen motor feedback | PL d, Cat.3 | SIL CL 2 | 1.35E-07* | 20 |
* = depends on the MTTFD value of the used feedback. The higher MTTFD the smaller is PFHD . This has an influence to the complete system, even if PL and SIL classes don't change.
With safety card S1-2 and two feedback systems
In this case the system depends on the used feedback systems, therefore the system must be calculated individually. The given subsystem below is built from S700 and safety card S1-2, the feedback systems used by Kollmorgen are given as parts (see "Characteristic Data Feedback").
| Device | EN 13849-1 | EN 62061 | PFHD (1/h) | TM (years) |
|---|---|---|---|---|
| S700 with Safety card S1-2 | PL e, Cat.4 | SIL CL 3 | 1.19E-08 | 20 |
