National Instruments UMI-4A, Руководство пользователя

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UMI Accessory User Guide — UMI-Flex6 22 www.natinst.com
Figure 24. UMI-Flex6 Axes Amplifier/Driver Terminal Block Pin Assignments
The Analog Output signals are used as command outputs to a servo
amplifier or as general-purpose voltage outputs. The Step and Dir signals
are used as command outputs to a stepper driver.
The Inhibit Output signals are used to disable the amplifier/driver for that
axis. The UMI combines the host bus interlock circuit, the Inhibit Input
signals, and the per axis controller Inhibit Output to create the per axis
Inhibit Output signal. The host bus interlock monitors the +5 V pin from
the motion controller to verify that the controller is powered and properly
connected to the UMI. If the host bus interlock detects a problem, or if any
Inhibit Input signal is asserted, or the controller Inhibit Output signal for
that axis is asserted, the Inhibit Output for that axis is asserted.
You can configure the Axis Inhibit Out signal as active-low or active-high
outputs using switch SW2. Setting SW2 to the right configures the signal
as active-low; setting SW2 to the left configures the signal as active-high.
Note You must configure the controller’s Inhibit Output signals as active low for proper
operation of the inhibit circuitry.
Encoder Terminal Block
For incremental encoder connections, each UMI-Flex6 axis has a separate
8-position terminal block. UMI-Flex6 accepts either single-ended TTL or
differential line driver inputs. You can connect open-collector encoders to
the UMI-Flex6 accessory by installing a 2.2 k
Ω
pull-up resistor to +5 V.
Note
Encoders with line driver outputs are recommended for all applications and must be
used if the encoder cable length is greater than 10 feet.
1
2
3
4
5 Analog Output
Analog Output Ground
+5 V (Output)
Digital Ground
Inhibit Output
Axes 1–4 Axes 5–6
1
2
3
4
5
6
7 Analog Output
+5 V (Output)
Digital Ground
Inhibit Output
Step (CW)
Dir (CCW)
Analog Output Ground