National Instruments UMI-7764 User Manual

National Instruments UMI-7764 User Manual Manual pdf 22 page image

UMI Accessory User Guide — UMI-Flex6 22 www.natinst.comFigure 24. UMI-Flex6 Axes Amplifier/Driver Terminal Block Pin AssignmentsThe Analog Output signals are used as command outputs to a servoamplifier or as general-purpose voltage outputs. The Step and Dir signalsare used as command outputs to a stepper driver.The Inhibit Output signals are used to disable the amplifier/driver for thataxis. The UMI combines the host bus interlock circuit, the Inhibit Inputsignals, and the per axis controller Inhibit Output to create the per axisInhibit Output signal. The host bus interlock monitors the +5 V pin fromthe motion controller to verify that the controller is powered and properlyconnected to the UMI. If the host bus interlock detects a problem, or if anyInhibit Input signal is asserted, or the controller Inhibit Output signal forthat axis is asserted, the Inhibit Output for that axis is asserted.You can configure the Axis Inhibit Out signal as active-low or active-highoutputs using switch SW2. Setting SW2 to the right configures the signalas 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 properoperation of the inhibit circuitry.Encoder Terminal BlockFor incremental encoder connections, each UMI-Flex6 axis has a separate8-position terminal block. UMI-Flex6 accepts either single-ended TTL ordifferential line driver inputs. You can connect open-collector encoders tothe UMI-Flex6 accessory by installing a 2.2 kΩ pull-up resistor to +5 V.Note Encoders with line driver outputs are recommended for all applications and must beused if the encoder cable length is greater than 10 feet.12345Analog OutputAnalog Output Ground+5 V (Output)Digital GroundInhibit OutputAxes 1–4 Axes 5–61234567Analog Output+5 V (Output)Digital GroundInhibit OutputStep (CW)Dir (CCW)Analog Output Ground