Allen-Bradley PowerFlex 70 Reference Manual page 77

and [Logic Mask] parameters, the terminal block becomes direction owner as
soon as one (or both) of the "Jog Forward" or "Jog Reverse" input functions is
closed.
• Speed select 1, 2, and 3
One, two, or three digital input functions can be used to select the speed
reference used by the drive, and they are called the Speed Select input
functions. The current open/closed state of all Speed Select input functions
combine to select which source is the current speed reference. There are 8
possible combinations of open/closed states for the three input functions, and
thus 8 possible parameters can be selected. The 8 parameters are: [Speed Ref
A Sel], [Speed Ref B Sel], and [Preset Speed 2] through [Preset Speed 7].
If the Speed Select input functions select [Speed Ref A Sel] or [Speed Ref B
Sel], then the value of that parameter further selects a reference source. There
are a large number of possible selections, including all 7 presets.
If the input functions directly select one of the preset speed parameters, then
the parameter contains a frequency that is to be used as the reference.
The terminal block bit must be set in the [Reference Mask] and [Logic Mask]
parameters in order for the reference selection to be controlled from the
terminal block using the Speed Select inputs functions.
Important: Reference Control is an "Exclusive Ownership" function (see
Owners on page
(terminal block, DPI device, HIM, etc.) at a time is allowed to
select the reference source. The terminal block must become
direction "owner" before it can be used to control direction. If
another device is currently the reference owner (as indicated by
[Reference Owner]), it will not be possible to select the reference
by using the terminal block digital inputs, and the Speed Select
Inputs will have no effect on which reference the drive is
currently using.
Because any combination of open/closed conditions (or unwired condition)
commands a reference source, terminal block seeks ownership of reference
selection as soon as any of these input functions are configured, which may
happen at power-up. In order for the terminal block to actually gain
ownership, the masks must be set up correctly (see above) and no other device
can currently have reference ownership. Once the terminal block gains
reference ownership, it will retain it until shutdown, until the [Reference
Mask] or [Logic Mask] bits for the terminal block are cleared, or until none of
the digital inputs are configured as Speed Select input functions.
The Speed Select input function configuration process involves assigning the
functionality of the three possible Speed Select input functions to physical
digital inputs. The three Speed Select inputs functions are called "Speed
Select 1", "Speed Select 2", and "Speed Select 3", and they are assigned to
physical inputs using the [Digital Inx Sel] parameters.
Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013
125). This means that only one control device
Digital Inputs
77