The Ssm Signals - Danfoss Vacon OPTEA Operating Manual

VACON® NXP Advanced Safety Options
Operating Guide
Table 40: The State of the SSM Safe Output
Condition
SSM requested (request active, even after a violation)
SSM not requested (request not active)
Fatal/Resettable Fault
The table below shows the behavior of signals SSM Below Min Limit and SSM Above Max Limit that indicate which limit the speed
has crossed.
Table 41: Possible Combinations and the Results of the SSM Function
Condition
SSM Min Limit ≤ actual speed ≤ SSM Max Limit
or
SSM Min Limit ≤ actual speed, SSM Max Limit = 0
actual speed > SSM Max Limit
actual speed < SSM Min Limit
SSM not active
or
Fatal/Resettable Fault

6.3.5.4 The SSM Signals

It is possible that the Active and Reached signals that are mentioned in this chapter are not always available in all interfaces.
The availability of the signals over safe fieldbus depends on the used fieldbus protocol. Refer to chapter Safe fieldbuses for more
information.
The SSM signals are updated during the operation of the STO function, and during the violations of other safety functions.
Table 42: The SSM Signals
Signal Activation and deactivation of the signal
SSM Active Activation:
• SSM is requested and starts execution.
Deactivation (manual acknowledgment):
• Acknowledgment signal received and SSM is not requested.
Deactivation (automatic acknowledgment):
• SSM request ends.
Deactivation (SSM violation situations):
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Speed
Actual speed inside the allowed
range
Actual speed outside the allowed
range
Any
–
SSM Reached SSM Below Min Limit
1 (Active) 0
0 (Inactive) 0
0 (Inactive) 1
0 (Inactive) 0
N O T I C E
N O T I C E
Safety Functions
SSM Reached SSM Out (DOUTx)
Active Active
Inactive Inactive
Inactive Inactive
Inactive Inactive
SSM Above Max Limit
0
1
0
0
Description
The signal indicates if the SSM The signal indicates if the SSM
function is being executed. function is being executed.
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