Safe Torque Off Activation; Safe Torque Off Reset - Allen-Bradley PowerFlex 755 User Manual
Integrated safety functions option module
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- User manual (102 pages) ,
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- Product information (10 pages)
Table of Contents
Chapter 4
Drive-based Safe Stop Functions
STO Output
SS1 Complete
Safety Stop Fault
Safety Limit Fault
Safety Limit Active
(1)
Connection Loss
(2)
Connection Idle
(1) Connection Loss Action = STO
(2) Connection Idle Action = STO
72
Safe Torque Off Activation
Safe Torque Off can be initiated by one or more sources:
• STO Output – Setting the Safety Output Assembly Tag
(module:SO.STOOutput = 1)
• SS1 Complete – Completion of a Safe Stop 1
• Stop Fault – Any Safety Fault
• Limit Fault – Reserved for future use
• Limit Active – Reserved for future use
• Connection Loss – Loss of connection to the safety controller
• Connection Idle – Safety controller in program mode
When STO is activated, all sources of activation are stored in an attribute as a
bit mask. The attribute can then be read to determine the causes of a STO
activation.
Figure 19
STO Activation attribute can be read with explicit messaging (see attribute 265
in
Table 18 on page
Figure 19 - Safe Torque Off Activation
STO Activation
STO Output
SS1 Complete
Safety Stop Fault
Safety Limit Fault
Safety Limit Active
Connection Loss
Connection Idle
Safe Torque Off Reset
After torque is disabled due to a STO activation, the STO function must be
reset in order to enable torque. When the STO function must be reset, the
following attribute values are set:
• module:SI.STOActive = 1
• module:SI.RestartRequired = 1
• In Standard Control Mode
– Host: P4 [Safety Status] STO Active = 1
– Host: P4 [Safety Status] Restart Req = 1
Rockwell Automation Publication 750-UM005A-EN-P - October 2018
shows the operation of the STO activation attribute. The
247.
Logical
STO Active
OR
SBC Delay
Negative Value: Delay = |Value|
Positive Value: Delay = 0
Safety Fault: Delay = 0
STO to
Torque Disabled
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