168 Rockwell Automation Publication 2198-UM001M-EN-P - November 2022
Chapter 10 Kinetix 5500 Safe Torque Off - Integrated Safety
Figure 79 - Kinetix 5500 STO Timing Diagram - Manual Restart
Fault Codes
Probability of Dangerous
Failure Per Hour
Safety-related systems are classified as operating in a High-demand/
continuous mode. The SIL value for a High-demand/continuous mode safety-
related system is directly related to the probability of a dangerous failure
occurring per hour (PFH).
PFH calculation is based on the equations from IEC 61508 and shows worst-
case values. Table 76
provides data for a 20-year proof test interval and
demonstrates the worst-case effect of various configuration changes on the
data.
Drv:SO.SafeTorqueOff
Drv:SO.Reset
Drv:SI.ResetRequired
Drv:SI.TorqueDisabled
Axis.SafeTorqueOffActiveStatus
Axis.SafeTorqueOffActiveInhibit
Axis.SafeTorqueDisabledStatus
Safe Torque-off Request
Axis.SafetyResetRequestStatus
Axis.SafetyResetRequiredStatus
Reset Request
This manual links to Kinetix 5500 Servo Drive Fault Codes Reference
Data, publication 2198-RD005
, for fault codes. Download the
spreadsheet now for offline access.
IMPORTANT Determination of safety parameters is based on the assumptions that
the system operates in High-demand mode and that the safety
function is requested at least once every three months.
Table 76 - PFH for 20-year Proof Test Interval
Attribute Value
PFH (1e-9) 1.54
Proof test (years) 20
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