118 Rockwell Automation Publication 20A-UM001N-EN-P - July 2013
Appendix C Application Notes
Auto/Manual Examples
PLC = Auto, HIM = Manual
A process is run by a PLC when in Auto mode and requires manual control from
the HIM during setup. The auto speed reference is issued by the PLC through a
communications module installed in the drive. Because the internal
communications is designated as port 5, P90 [Speed Ref A Sel] is set to “DPI
Port 5” with the drive running from the Auto source.
Attain Manual Control
• Press ALT then Auto/Man on the HIM.
When the HIM attains manual control, the drive speed command comes
from the HIM speed control keys.
Release to Auto Control
• Press ALT then Auto/Man on the HIM again.
When the HIM releases manual control, the drive speed command returns
to the PLC.
PLC = Auto, Terminal Block = Manual
A process is run by a PLC when in Auto mode and requires manual control from
an analog potentiometer wired to the drive terminal block. The auto speed
reference is issued by the PLC through a communications module installed in the
drive. Because the internal communications is designated as port 5, P90 [Speed
Ref A Sel] is set to “DPI Port 5” with the drive running from the Auto source.
Because the Manual speed reference is issued by an analog input (“Analog In 1 or
2”), P96 [TB Man Ref Sel] is set to the same input. To switch between Auto and
Manual, [Digital In4 Sel] is set to “Auto/ Manual”.
Attain Manual Control
• Close digital input 4.
With the input closed, the speed command comes from the potentiometer.
Release to Auto Control
• Open digital input 4.
With the input open, the speed command returns to the PLC.
Auto/Manual Notes
1. Manual control is exclusive. If a HIM or terminal block takes manual
control, no other device can take manual control until the controlling
device releases manual control.
2. If a HIM has manual control and power is removed from the drive, the
drive returns to Auto mode when power is reapplied.
To Next Page
Loading...
Need help?
General
