Mitsubishi Electric MELSEC iQ-R Series - Page 21

3 RISK ASSESSMENT AND SAFETY LEVEL
3.1 Risk Assessment
19
3
(For details, refer to ISO12100: 2010)
(4)
(2)
(1)
(3)
NO
YES
Documentation
Hazard identification
Determination of the limits
of the machinery
Start
Risk assessment
Risk estimation
Risk evaluation
SIL*
1
PL*
2
Has the risk been
adequately reduced?
End
(1)
(2)
(3)
(4)(4)
YES
YESYES
YES
YES
YESNO
NO
NO
NO
YES
NO
NO
NO
NO
YES
Risk reduction by
inherently safe
design measures
Step 1*
3
Are other hazards
generated?
Is the intended risk
reduction achieved?
Risk reduction by safeguarding
Implementation of complementary
protective measures
Step 2*
3
Is the intended risk
reduction achieved?
Risk reduction by
information for use
Step 3*
3
Can the hazard
be removed?
Can the limits be
specified again?
Can the risk be
reduced by inherently
safe design measures?
Can the risk be
reduced by guards,
protective devices?
Is the intended risk
reduction achieved?