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Digital Input/Output and PFI

This chapter describes the digital input/output (DIO) and Programmable Function Interface

(PFI) functionality available on the cDAQ chassis. Refer to the Digital Input/Output and PFI

sections.

Digital Input/Output

To use digital I/O, insert a digital I/O C Series module into any slot on the cDAQ chassis. The

I/O specifications, such as number of lines, logic levels, update rate, and line direction, are

determined by the type of C Series I/O module used. For more information, refer to the

documentation included with your C Series I/O module(s).

Serial DIO versus Parallel DIO Modules

Serial digital I/O modules have more than eight lines of digital input/output. They can be used

in any chassis slot and can perform the following tasks:

• Software-timed and hardware-timed digital input/output tasks

Parallel digital I/O modules can be used in any chassis slot and can perform the following tasks:

• Software-timed and hardware-timed digital input/output tasks

• Counter/timer tasks (can be used in up to two slots)

• Accessing PFI signal tasks (can be used in up to two slots)

• Filter digital input signals

Software-timed and hardware-timed digital input/output tasks have the following restrictions:

• You cannot use parallel and serial modules together on the same hardware-timed task.

• You cannot use serial modules for triggering.

• You cannot do both static and timed tasks at the same time on a single serial module.

• You can only do hardware timing in one direction at a time on a serial bidirectional module.

To determine the capability of digital I/O modules supported by the cDAQ chassis, go to

ni.com/info and enter the Info Code rdcdaq.

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