Delta Tau ADVANTAGE 900 BASIC PACKAGE Manual do Utilizador descarregar pdf (Página 20)

Universal Serial Operator Control Logic Board

16 SOCLB Software Setup

Installing Advantage 8xx Software Files

A Brief CNC History Lesson

A highly misunderstood facet of machine tool control integration is the interaction between the machine

servo’s (axis motors) and the I/O (inputs and outputs, machine tool front panel and real world I/O). G, M,

and PLC (or Programmable Logic Controller) programs are what make a machine tool operate as a

machine tool. Without machine execution commands, automatic coolant, lube, tool changers, drawbars,

spindle gear changers, etc., all CNC machine tools become manual machines.

Since the advent of computer numerical control in the 1950’s, G codes (technically called preparatory

commands) and M codes (known as miscellaneous commands) have been the industry standard way of

directing a machine tool to execute specific type of machine sequences and functionalities. In the 1960’s,

a standards committee adapted what we now call RS-274D in an attempt to define G codes.

Unfortunately, RS-274D fell short of being strictly adhered to by machine tool builders, and thus a

myriad of different types of G and M codes now exist. It did not get any better when it came to the PLC

portion of the CNC.

At its very essence, a PLC controller is a state controller machine. Typically, a unique PLC logic

program will be written in either ladder logic or structured text programming for each application

requirement. A PLC program will normally reside within the PLC memory, and that logic program

determines when a machine condition is sensed (input), and then executes the appropriate logic result

(output).

Most CNC systems on the market today have their G, M, and PLC codes embedded in firmware (EPROM

devices). Most CNC systems have one monolithic PLC program control all the machine tool I/O

functionality. These two factors make user modification at best expensive, and many times impossible.

Unlike most machine tool controller systems on the market today, Delta Tau’s Advantage CNC systems

have incredible flexibility and functionality. The difference is simple and elegant, all the G, M, and PLC

codes in all Advantage CNC systems are written in software, not firmware or hardware.

Advantage 8xx CNC systems has been successfully integrated into up to eight axis machining, four axis

turning, grinding, punch press, water jet, laser jet, plasma cutting, and wood routing applications.

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