NI 9401 (Scan Interface)

CompactRIO Scan Interface

NI 9401 (Scan Interface)

CompactRIO 8-Channel, TTL Digital Input/Output Module


Module I/O Variables

To use I/O from this module in a VI, drag and drop I/O variables from the Project Explorer window to the block diagram of the VI. The I/O variables for the channels read and write Boolean values.

Module Channels

The NI 9401 has the following channels.

Channel Description
DIOx Digital input/output channel x, where x is the number of the channel. For the NI 9401, x is 0 to 7.

C Series Module Properties Dialog Box

Use this dialog box to configure the NI 9401. Right-click the NI 9401 in the Project Explorer window and select Properties to display this dialog box. You can configure the following options.

  • Name—Specifies the name of the C Series module, which appears in the Project Explorer window. LabVIEW assigns a default name to the module based on the slot number. You can use this field to give the module a descriptive name.
  • Module Type—Specifies the type of C Series module. You cannot change this value.
  • Location—Specifies a slot in the chassis for the C Series module.
  • Initial Line Direction—Specifies the initial line direction of each four-channel port as input or output.

Specialty Digital Configuration

You can use the Specialty Digital Configuration page of the C Series Module Properties dialog box to configure channels of this module for pulse-width modulation output, counter input, or quadrature input.

Hardware Documentation

Refer to the NI 9401 Operating Instructions and Specifications to learn about module specifications and how to use the module. Refer to the CompactRIO Related Documentation (Scan Interface) topic for further information about CompactRIO documentation.