Rockwell Automation Liqui-Flo 1.5 General Purpose and Vector Duty - Manual (Page 111)

Parameter Descriptions 4-79
23, 24 = MOP Increment, MOP Decrement: The MOP is a reference setpoint (called
the MOP Value) that can be incremented and decremented by external devices.
These inputs are used to increment and decrement the Motor Operated Potentiometer
(MOP) value inside the drive. The MOP value will be retained through a power cycle.
While the MOP Increment input is closed, the MOP value will increase at rate
contained in MOP Rate. Units for rate are Hz per second.
While the MOP Decrement input is closed, MOP value will decrease at rate contained
in MOP Rate. Units for rate are Hz per second.
If both the MOP Increment and MOP Decrement inputs are closed, the MOP value will
stay the same.
In order for the drive to use the MOP value as the current speed reference, either
Speed Ref A Sel must be set to MOP.
25 = OIM Control: This input provides a mean to override the logic control source
selection and can be used to override control from any port, including the All Ports
selection.
An open-to-closed transition of this input sets the control source to the local OIM. If no
local OIM is present, the control source is set to the remote OIM. If no OIM is present
at all, the drive stops.
When control is set to the OIM, the OIM is granted manual reference (the Man Ref
Preload (193) configuration is enforced). Subsequent Auto/Manual commands will
toggle the OIM in and out of manual mode. The drive’s active or stopped state is not
affected unless no OIM is present.
On a closed-to-open transition, manual control is released if active, and the selected
auto reference is used. The logic source select override is removed. The
edge/level-sense start configuration is imposed (LevelSense Start).
26 = PI Enable: If this input function is closed, the operation of the Process PI loop will
be enabled.
If this input function is open, the operation of the Process PI loop will be disabled.
27 = PI Hold: If this input function is closed, the integrator for the Process PI loop will
be held at the current value; that is, it will not increase.
If this input function is open, the integrator for the Process PI loop will be allowed to
increase.
28 = PI Reset: If this input function is closed, the integrator for the Process PI loop will
be reset to 0.
If this input function is open, the integrator for the Process PI loop will integrate
normally.
Type 2 Alarms
Some digital input programming may cause conflicts that result in a Type 2 alarm. For
example, Digital In1 Sel set to 5 (Start) in 3-wire control, and Digital In2 Sel set to 7
(Run) in 2-wire control. Refer to chapter 5 for more information about these alarms.
Dig In Status (116) indicates the current state of the digital inputs.