Allen-Bradley PowerFlex 70 Reference Manual page 74

Digital Inputs
74
Open Closed
Closed Open
Closed Closed
If one of these input functions is configured and the other one isn't, the above
description still applies, but the unconfigured input function should be
considered permanently open.
The terminal block bit must be set in the [Start Mask], [Direction Mask], and
[Logic Mask] parameters in order for the terminal block to start or change the
direction of the drive using these inputs.
Important: Direction control is an "Exclusive Ownership" function (see
Owners). This means that only one control device (terminal
block, DPI device, HIM, etc.) at a time is allowed to control
direction at a time. The terminal block must become direction
"owner" before it can be used to control direction. If another
device is currently the direction owner (as indicated by
[Direction Owner]), it will not be possible to start the drive or
change direction by using the terminal block digital inputs
programmed for both Run and Direction control (i.e. Run/
Fwd).
If one or both of these input functions is configured, it will not be possible to
start or jog the drive from any other control device. This is true irrespective of
the state of the [Start Mask], [Direction Mask], and [Logic Mask] parameters.
• Run
An open to closed transition on this input while drive is stopped will cause the
drive to run in the currently selected direction unless the "Stop - Clear Faults"
input function is configured and open.
If this input is open, then the drive will stop.
The purpose of this input function is to allow a 2-wire start while the
direction is being controlled by some other means.
The terminal block bit must be set in the [Start Mask] and [Logic Mask]
parameters in order for the terminal block to start the drive using this input.
If the "Run" input function is configured, it will not be possible to start or jog
the drive from any other control device. This is true irrespective of the state of
the [Start Mask], [Direction Mask], and [Logic Mask] parameters.
The Effects of 2-Wire Start Modes on Other DPI Devices
The "Run/Stop" and "Run Fwd/Rev" start modes are also called "2-wire"
start modes, because they allow the drive to be started and stopped with only a
single input and two wires. When a "2-wire" terminal block start mode is put
into effect by the user, the drive can no longer be started or jogged from any
other control device (i.e. HIM, network card, etc.). This restriction persists as
long as one or more of "Run", "Run Forward", and "Run Reverse" are
configured. This is true even if the configuration is otherwise illegal and
Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013
Drive runs in reverse direction, terminal block takes direction ownership.
Drive runs in forward direction, terminal block takes direction ownership.
Drive continues to run in current direction, but terminal block maintains
direction ownership.