Bosch Rexroth IndraControl S20 Manual page 37

DOK-CONTRL-S20*SSDO*8*-AP02-EN-P
IndraControl S20 Module With Safe Digital Outputs S20-SSDO-8/3
SIL/SIL CL
Performance level
Categories
Use the standard to determine the failure probability of your appli‐
cation acc. to IEC 61508 (SIL) or EN 62061 (SILCL).
Safety integrity
SIL 2/SILCL 2
SIL 3/SILCL 3
Tab. 7-2: PFD and PFH depending on SIL/SILCL
Use the standard EN ISO 13849-1 to determine the Performance
Level (PL)
The categories are attained by applying the following measures:
Action
Use proven and basic safety principles acc. to EN ISO
13849-2.
Use qualified actuators, refer to
tors and receiving devices" on page
Note that mechanical failure of the switching device can
cause the loss of the safety function.
Impede welding of the contacts of the connected contac‐
tors or safety relays by protecting them against overcur‐
rent and overvoltage.
Note that one single error can cause the loss of the safety
function between the checks.
Ensure that the external wiring is regularly checked by the
machine control upon machine startup. This check has to
detect the loss of the safety function.
Ensure that the module is switched off safely with respect
to the application if an error occurs or that a warning is
generated (optically and/or acoustically).
Note that all undetected errors can cause the loss of the
safety function. Take measures allowing the exclusion of
these errors (e.g. protected wiring of cables or double in‐
sulation). Observe the notes in the following tables.
Consider errors with common cause.
Ensure that one single error does not cause the loss of the
safety function.
If the test pulses are switched off, check the switch-off ca‐
pability of the actuators regularly.
An accumulation of errors may not cause the loss of the
safety function. The observation can be canceled after the
third error if the probability that more errors occur is low.
"Probability of dangerous failure on demand"
1)
"Probability of dangerous failure per hour"
2)
Bosch Rexroth AG
Connection examples of the safe outputs
PFD
1)
1 % of 10 -2
1 % of 10 -3
"Requirements on actua‐
14.
35/85
PFH
2)
1% of 10 -6
1% of 10 -7
Cat. 2 Cat. 3 Cat. 4
x x x
x x x
x x x
x x x
x
x
x
x x
x x
x
x x
x