
Safe Torque Off
6-19
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames E & F
Transitional state.
User should avoid
remaining in this
state
Fault state
Normal state
STO State Transition Diagram
The flow chart below shows how the drive responds to STO inputs, start and stop commands.
Key:
* = One channel
operation
** = Two channel
operation
Out-of-box state
Normal startup state
X11/01 low
X11/03 low
Drive cannot run **
X11/01 low
X11/03 high
Drive cannot run *
X11/03 high
X11/01 high
X11/01 low
X11/03 low
X11/01 high
X11/03 low
Drive cannot run *
X11/01 high
X11/03 high
Drive enabled but
not running
X11/03 high
X11/03 low
X11/01 high
X11/01 low
X11/01 high
X11/03 high
Drive runs
X11/03 low
X11/01 low
START command
STOP command
Fault state
Drive cannot run.
ALL Power must
be cycled
2.3 seconds
2.3 seconds