Digital Inputs 2-69
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 2-127). This means that only one
control device (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.
The table below describes the various reference sources that can be
selected using all three of the Speed Select input functions.
If any of the three Reference Select input functions are not configured,
then the software will still follow the table, but will treat the
unconfigured inputs as if they are permanently open.
As an example, the table below describes what reference selections can
be made if “Speed Select 1” is the only configured input function. This
Speed Select 3 Speed Select 2 Speed Select 1 Parameter that determines Reference
Open Open Open [Speed Ref A Sel]
Open Open Closed [Speed Ref B Sel]
Open Closed Open [Preset Speed 2]
Open Closed Closed [Preset Speed 3]
Closed Open Open [Preset Speed 4]
Closed Open Closed [Preset Speed 5]
Closed Closed Open [Preset Speed 6]
Closed Closed Closed [Preset Speed 7]
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