Safety engineering
Safety functions
Safe direction
1
74
EDS94AYAE EN 6.0
1.3.10 Safe direction
1.3.10.1 Description
Safe Direction / SDI
This function monitors the safe compliance with an adjustable direction of rotation. The
monitoring also includes zero speed with a tolerance window.
If the valid direction of rotation is not complied with, optionally SS1, SS2, or STO can be
activated.
After the adjustable delay time has expired (C15341), the function monitors the
compliance with the positive/negative direction of movement.
When operating within the limit values (C15342), the "SDIxxx monitored" status is set
(C15000). The status can be assigned to the safe output (C15052/1). The status can also be
reported via the safety bus.
If deviations from the permissible direction of movement occur, an error stop will be
triggered. As an error response, STO, SS1, or SS2 can be set (C15343). In the event of an error
the maximum change in position is displayed (C15344).
t
n
0
1
t
S
2
SDIpos
1
SDIpos
2
0
0
I
I
t
t
t1
t
0
I
0
SMxDIASLS
Input signal of the request of a safety function
’1’ Logic signal level "1" / "TRUE"
Direction of movemtn of the motor
tx Action instant
t Time axis
t
s
Delay time
Feedbacks
SDIpos1 SDIpos active
SDIpos2 SDIpos monitored
Error response − triggering motion range
Adjustable SDI tolerance threshold
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