Heidenhain LE 430CA Logic Unit 326 424-59 for TNC 430

The HEIDENHAIN LE 430CA (ID.NR. 326 424-59, S.NR. 10 264 743 A) is a logic unit and electronics module that serves as the main board for processing, interface, and power distribution in HEIDENHAIN TNC 430 CNC control systems. ​

Role in the TNC 430 system

The LE 430CA is a member of the TNC 426/430 series. It is the main logic unit inside the CNC control and contains the NC processor, PLC section, memory, and connections for machine I/O and operator components.

It links to the power supply, the display/keyboard unit, the axis/drive interfaces, and the external communication ports. It is the main control electronics that run machining programs and control the machine’s functions. ​

Functional Features

The board works with HEIDENHAIN conversational and ISO (DIN/ISO) programming formats. It can handle path motion, tool compensation, coordinate transformations, probing cycles, and other numerical control tasks that the TNC 430 offers.

It also has a PLC part that manages machine signals such as limit switches, coolant, spindle functions, and other outputs using digital and analog I/O linked by modules on the machine side.

The logic unit has non-volatile memory and a buffer battery that keep parameters and vital data safe during power outages. The service handbook explains how to change the battery and run diagnostics for LE 426/LE 430 logic units. ​

Connections and Interfaces

The LE 430CA has several serial data ports, like RS-232 and RS-422/V.11, and it can also connect to Ethernet networks for program transfer, remote diagnostics, and connecting to other PCs or networks. The connector fields on the board connect to external operator components, PLC I/O, power supply inputs, and encoder signals.

The TNC 426/430 technical and service manuals include specific pinouts so that service technicians can test and replace the logic unit when necessary.

The board is made to fit into the control housing as a plug-in module. This way, it can be replaced as a whole unit when it breaks down. This is why it is typically sold as a spare part with the ID number 326 424-59. ​

Application

The LE 430CA logic unit is used in industrial CNC milling and machining centers that have TNC 430 CA/PA controllers. It provides reliable numerical control processing in tough shop-floor conditions.

This logic unit is good for multi-axis machining since it has capabilities like tool management, program management, probing support, and different machining cycles that are all built into the hardware and software.

This module is typically sold as a used or extra part to repair existing HEIDENHAIN TNC 430 systems that require a new logic unit to restore CNC functionality.