Safety engineering
Safety functions
Integration into the application of the controller
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EDS94AYAE EN 6.0
1.3.2.1 Control information
The safety module transfers information via requested or active safety functions with the
control word SMI_dwControl. The application in the standard device must evaluate the
control word and execute the corresponding action.
The following table shows the bit coding of the control word.
Control word â SMI_dwControl
Bit Name Meaning
1 SS1 active Safe stop 1 requested
2 SS2 active Safe stop 2 requested
3 SLS1 active Safely limited speed 1 requested
4 SLS2 active Safely limited speed 2 requested (as of SM301 V1.1)
5 SLS3 active Safely limited speed 3 requested (as of SM301 V1.1)
6 SLS4 active Safely limited speed 4 requested (as of SM301 V1.1)
7 SDIpos is active The safe positive direction of movement (SDIpos) function is active.(As of SM301
V1.3)
After the parameterised SDI deceleration time has expired, bit 12 of the status
signal SMI_dnState (SdIpos monitored) is set in addition.
8 SDIneg is active The safe negative direction of movement (SDIneg) function is active.(As of
SM301 V1.3)
After the parameterised SDI deceleration time has expired, bit 13 of the status
signal SMI_dnState (SdIneg monitored) is set in addition.
9 ES active Motion functions in special operation requested
10 SLI is active Safely limited increment is active.(As of SM301 V1.4)
11 OMS Special operation requested
(0 = normal operation)
16 SOS is active Safe operating stop maintained
17 SLS1 monitored Safely limited speed 1 maintained
18 SLS2 monitored Safely limited speed 2 maintained (as of SM301 V1.1)
19 SLS3 monitored Safely limited speed 3 maintained (as of SM301 V1.1)
20 SLS4 monitored Safely limited speed 4 maintained (as of SM301 V1.1)
23 SSE active Emergency stop active (Safe Stop Emergency)
29 OMS active Special operation active (Operation Mode Selector) (as of SM301 V1.1)
31 Error Error detected
(0 = proper operation)
1.3.2.2 Status information
The safety module transfers information via the status of safety functions with the
SMI_dnState status word.
The SMI_dnIoState status word contains information on the status of the safe inputs and
the safe output. The application in the standard device can evaluate and use the status
words for additional tasks.
The following tables show the bit coding of the status words:
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