34 Rockwell Automation Publication 750-UM002H-EN-P - February 2017
Chapter 3 Safe Torque Off Option Module Operation
Figure 9 - Stop Category 0
Table 10 - POINT Guard I/O Example Summary
SP+
SP–
Sd
SE+
SE–
Sd
O0
O1
O2
COM
COM
I0
I1
I2
I3
24V
COM
24V
COM
24V DC
0V DC COM
Gray
Pink
AC Line
Input Power
Motor
PowerFlex 750-Series
Drive
Gate Control
Jumpers:
ENABLE Installed
SAFETY Removed
SensaGuard
Interlock Switch
POINT Guard I/O™ Modules
1734-IB8S
Digital Input
1734-OB8S
Digital Output
Safety Reset
Fault Reset
Sinking Sourcing
Attribute Description
Circuit status
Circuit is shown with guard door closed and system ready for normal drive
operation.
Operating principle
When a partial-access guard door is opened, the safety system initiates and
maintains a stop command to stop hazardous motion before a person can reach the
hazardous area. The safety system cannot be reset, and hazardous motion cannot
be restarted while the guard door is open. Once the guard door is closed and the
stop command is reset, a valid start command is required before hazardous motion
can resume.
Fault detection
The GuardLogix controller-logic monitors the system for valid status and faults.
When it receives a safety demand on its inputs or an invalid status or fault is
detected, the GuardLogix controller-logic deactivates its safety outputs and sends a
safety stop command.
The PowerFlex drive monitors its internal safety circuits for valid status and faults.
When the GuardLogix controller de-energizes the drive Safe Torque Off (STO)
inputs, or an invalid state or fault is detected, the drive's STO feature forces the
drive output power transistors to a disabled state. The hazardous motion that is
controlled by the drive coasts or ramps to a stop. This feature does not provide
electrical power isolation.
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