Danfoss Vacon OPTEA Operating Manual page 62

VACON® NXP Advanced Safety Options
Operating Guide
Logical level
SSR Request
SSR Active
SSR Reached
SLS Request
SLS Active
SLS Reached
Acknowledgement
Illustration 24: Acknowledging a safety function separately. The SLS function is acknowledged. The SSR function is not acknowledged because
it stays requested. SLS: manual acknowledgment, SSR: manual acknowledgment.
After safe stopping functions are acknowledged and the STO function is deactivated, the drive can start if it has an active run
request.
The acknowledgment signal can also be used to control accidental starts of the drive. If the deactivation of the request of a safe
stopping function should not be able to allow the drive to start, use the manual acknowledgment. The drive can then start only
after a separate acknowledgment signal.
If a safe stopping function is used as an emergency stop according to the standard IEC-60204-1, the acknowledgment signal can be
used as the reset signal required by the standard. The reset signal of the Advanced safety option board does not correspond to the
emergency stop reset signal described in the standard.
In digital inputs, the acknowledgment signal is edge sensitive. The acknowledgment is done with inactive -> active transition (logi-
cal level). In safe fieldbuses, the acknowledgment signal is also edge sensitive, and it is done with a 0 -> 1 transition of the related
telegram bit.
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Safety Functions
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AQ319736045637en-000101 / DPD01798