Product Overview
The National Instruments PCI-7344 is a motion controller for PCI based computers. It provides four axes of motion control for stepper and servo motors. The card is designed for automated machinery, test stands, and laboratory positioning systems that require coordinated motion and deterministic trajectory execution.
The PCI-7344 is part of the NI motion control product family. It installs in a standard PCI slot and connects to motor drives and feedback devices through compatible cables and terminal blocks. Motion control can be programmed and coordinated with data acquisition and vision in the same application.
Four Axis Control
The controller supports four motion axes, which can be configured for stepper or servo operation depending on the drives and feedback in the system. Each axis can execute point to point moves, velocity moves, and coordinated multi axis trajectories. Engineers should confirm the supported motor types, encoder interfaces, and output signal formats for the specific card configuration.
Trajectory generation is handled by the controller, which reduces the timing burden on the host computer. This is important in applications that require smooth motion and precise synchronization with measurements. Engineers should tune each axis according to the mechanical load and drive characteristics.
Feedback and I/O
The card supports encoder feedback for position verification and closed loop control. Limit switches, home switches, and other digital I/O can be connected to support safe motion and referencing. Engineers should verify the input and output specifications and use appropriate isolation or conditioning where required.
Motion systems often include safety devices such as emergency stops and limit sensors. These should be wired according to the machine safety requirements and should not rely solely on software for protection. The controller can read status inputs and stop motion, but hardwired safety circuits remain essential for personnel and equipment protection.
Software and Programming
The PCI-7344 is supported by NI motion control software and can be programmed with LabVIEW, LabWindows/CVI, Measurement Studio, and other compatible development environments. Engineers can configure axes, define move profiles, and coordinate motion with other tasks in the application.
Motion applications should include clear error handling, status monitoring, and recovery procedures. Engineers should log axis position, velocity, and fault conditions during commissioning and production. This data helps diagnose mechanical issues and supports continuous improvement of the motion system.
Integration with Test Systems
In a test system, the motion controller can position a device under test, move a sensor or probe, or actuate a mechanism while measurements are acquired. Coordinating motion with data acquisition improves repeatability and reduces cycle time compared with manual positioning.
Engineers should plan cable routing for motor power, encoder feedback, and limit switches so that noise from motor drives does not couple into sensitive measurement wiring. Separation, shielding, and proper grounding are important in mixed motion and measurement systems.
Typical Applications
Automated test stands with positioning axes
Laboratory motion and scanning systems
Pick and place and assembly mechanisms
Probe and sensor positioning
Multi axis coordinated motion
Machine control with integrated measurement
The PCI-7344 provides four axes of stepper and servo motion control in a PCI card. Its trajectory generation, feedback support, and software integration make it suitable for automated motion control applications in test and machinery.
