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National Instruments Corporation
31
NI 9930 Motion Control Accessories User Guide
5.
Click the
Digital I/O
button to open the
Digital I/O
page and map the following status inputs.
a.
Map DI 1
to
Servo/Drive Ready
. This signal is active when the drive is enabled.
1)
Double-click the text in the
Mapping
column and select
Servo/Drive Ready
from the
dropdown list.
2)
Ensure that the DI 1 settings match the following:
•
Input Type
—Sourcing
•
Active State
—On
•
Digital Filter
—50 µs
b.
Map DI 2 to
In-Position
. The
In-Position
signal from the drive is active when the current
position is within a user-specified distance from the target position. This is a drive setting.
1)
Double-click the text in the
Mapping
column and select
In-Position
from the dropdown
list.
2)
Ensure that the DI 2 settings match the following:
•
Input Type
—Sourcing
•
Active State
—On
•
Digital Filter
—50 µs
c.
Map DI 3 to
Drive Fault/Alarm
. When the
Drive Fault/Alarm
signal is active, the module
does not generate command signals.
1)
Double-click the text in the
Mapping
column and select
Drive Fault/Alarm
from the
dropdown list.
2)
Ensure that the DI 3 settings match the following:
•
Input Type
—Sourcing
•
Active State
—Off
•
Digital Filter
—50 µs
d.
(Optional) Configure a digital output to use for the Alarm Clear signal, if required. Position
command drives often require an Alarm Clear signal from the module to the drive. This signal
clears the alarm or fault outputs on the drive. This functionality is not available using a
mappable digital output. However, you can use a digital output to implement this functionality
in your code. Complete the following steps to use a digital output as an Alarm Clear output:
1)
Determine the required pulse time and active state for the Alarm Clear signal. This
information is in the specifications for the position command drive.
2)
Select an available digital output.
3)
Configure the digital output
Active State
,
Safe State
, and
Output Type
as required by
the drive.
4)
In your application VI add code to pulse the digital output line for the appropriate amount
of time to clear the alarm output. Do not clear the alarm on the drive until the alarm
condition is resolved.
Note
If you are configuring a digital output to use as the Alarm Clear signal, you must connect the
configured output from the J5 screw terminal connector to the drive Alarm Clear signal on the J4
screw terminal connector.
Содержание NI 9930
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