Reference Manual Owner's manual

Rockwell Automation Publication 750-RM001F-EN-P - February 2012 119
Safe Maximum Speed and Direction Monitoring Chapter 9
Figure 44 - Positive Safe Direction Monitoring Timing Diagram
P42 [Direction Mon] = 1 “Pos Always”
Figure 45 - Negative Safe Direction Monitoring Timing Diagram
P42 [Direction Mon] = 2 “Neg Always”
If motion is detected in the incorrect direction while Safe Direction Monitoring
is active, a Direction fault occurs. If a Direction fault is detected while the safety
option is monitoring motion, the configured P45 [Safe Stop Type] is initiated
and direction monitoring is not performed during the safe stop. If a Direction
fault is first detected after the initiation of the safe stop, then all outputs go to
their faulted state.
For more information about faults, see Fault Reactions
on page 155.
0
300
Speed
Safe Direction Fault
Time
Safe Direction
0
-300
Speed
Time
Safe Direction
Safe Direction Fault