Table of Contents
Advertisement
2.1.2.11.1.1
Selecting a Mode
A mode can only be selected when the module is ready for operation and no
other mode is active. This is the case when the status bits Ready and
Stop_N_ACK are active and Start_ACK and Start are not active.
If these condition is not fulfilled, but a mode request bit is nevertheless set,
mode selection is delayed until this condition is fulfilled.
This ensures that any tasks already in progress are ended properly.
A mode is selected by setting the mode request bit. If a mode is already active,
setting of a further mode request bit has no function; the old mode (in
progress) is continued.
Selection of a mode is confirmed by the associated mode status bit *_ACK.
2.1.2.11.1.2
Ending a Mode
A mode is ended when the associated mode request bit is canceled. If the drive
is still in motion, it is then braked at the acceleration Acceleration_Stop_Fast.
The assigned mode status bit will not be canceled until the drive comes to a
standstill.
The Standstill status bit is set when the drive is motionless.
A mode is also ended when Stop_N_ACK is reset. If the drive is still in
motion, it is then braked at the acceleration Acceleration_Stop_Fast. The
assigned mode status bit will not be canceled until the drive comes to a
standstill.
A mode is also ended when Ready is reset. Velocity is set immediately to
zero, regardless of the status of the drive. The assigned mode status bit is
canceled immediately. This procedure poses the risk of losing control over the
drive and allowing the motor to run down in an uncontrolled manner, in
particular at loads with high moments of inertia. This is also normally
associated with step losses, meaning a reference run must subsequently be
started.
WAGO-I/O-SYSTEM 750
I/O Modules
750-671 [Steppercontroller]
Positioning
• 79
Advertisement
Table of Contents
