Mitsubishi Electric MELSEC iQ-R Series Safety Manual page 21

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