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Rockwell Automation Publication 35-UM001A-EN-P - May 2022
103
Chapter 6 Safety Functions
Figure 45 - Timed Safe Stop 1
Monitored Safe Stop 1
A Monitored Safe Stop 1 involves monitoring the motor feedback deceleration
rate and time, then initiating an STO activation when the motor feedback
speed is below a specified limit.
Monitored Safe Stop 1 Operation
When the Armor PowerFlex drive is configured for Monitored Safe Stop 1
Mode, the Safe Stop 1 function is initiated by setting the
devicename
:SO.SS1Request1 safety output tag. This sets the ‘SS1 Request’ bit in
the SS1 Activation attribute, and also sets the
devicename
:SI.SS1Active safety
input tag.
After the SS1 Active bit is set, the configured SS1 Decel Monitor Delay timer
begins. After the configured Decel Monitor Delay expires, an internal speed
ramp value is computed every time that the encoder is sampled. If the
magnitude of
devicename
:SI.FeedbackVelocity exceeds the sum of the internal
ramp plus Decel Speed Tolerance, the SS1 Fault Type attribute is set to
‘Deceleration Rate’ and the SS1 Fault attribute is set to Faulted.
0x00
0x01 = SS1 Request
Active
Disable Torque
Torque Disabled
Restart Required
0x02 = SS1 Complete
SS1 Ext Max Stop Time
Velocity
(1) Safety Output Assembly
(2) Safe Stop Function Attribute
(3) Safety Input Assembly
SI.RestartRequired
(3)
SI.STOActive
(3)
SI.SS1Active
(3)
SO.SS1Request
(1)
SS1 Activation
(2)
SI.TorqueDisabled
(3)
STO Activation
(2)
0x00
Required if Restart Type = Manual
SO.RequestReset
(1)
Restart Type = Automatic
Restart Type = Manual
0x00
0x00