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KinetiC-NC Highlights / 1.6MHz at a glance


1. The connection to the machine: Network


Why network-communication?

There are different ways to connect a machine control to a computer. The following explains briefly why (or why not) the individual types should be used.


LPT-Port

The output of real-time signals is only possible under Linux or DOS. The maximum speed is limited to 100kHz. The signal levels are only 3.3V. The transmission is not differential and has no potential separation.

As a result, the smallest EMC influences or grounding problems between the individual devices lead to a connection-failure. If the control PC fails or is not 100% real-time capable, the machine remains uncontrolled and the tool and workpiece are inevitably damaged.


USB port

The USB port has been developed for connecting secondary, serial devices, e.g. mouse, keyboard, printer. The USB connection is very EMC-sensitive, the cable lengths are restricted to max. 5 m. Switching on a fluorescent tube can interrupt the USB connection.

The connection is not isolated. Until the control PC restores this connection no communication with the machine is possible and the same is true for the LPT port. Likewise, most USB controllers are not able to handle fast communications, usually a transfer of 50-100 blocks per second is possible.


Netzwerk-Anschluß

Network connection

The network connection, also called Ethernet, is an industrially standardised connection via shielded, interference-resistant cables. The transmission is completely isolated and differential. A network connection is EMC-interference proof, tested in a harsh industrial environment and very fast.

Further advantages are that each PC has a built-in RJ45 Ethernet interface, there is no restriction on the operating system used. The cable length in an Ethernet segment can be > 100 m, connection is possible via switches, so that several machines in a network can be operated simultaneously without any problems.

The user does not have to configure anything, just connect it. The software finds the machine completely by itself. In this way, any number of modules can be controlled, for example for switching inputs and outputs.

Conclusion: a problem-free, reliable operation is only possible with a network connection.


2. Control of the machine


There are many ways to supply the machine with signals.

Control software and breakout board (LPT, USB)

This alternative provides only the signals of the hardware calculated in the control PC. Thereby an electrical isolation is achieved and in the case of USB you can also control a few outputs.

However, the calculation of the total step/direction signals takes place in the control computer, which must be real-time capable. Operating systems like Windows are not real-time capable. In doing so an extremely high demand is also placed on the hardware of the control computer.

If this control calculator blocks for only a few milliseconds the machine remains uncontrolled and the instrument and parts are damaged. A continuation at this position is impossible, the control computer has lost the position of the machine.


Stand-alone processor with path calculation

The KinetiC-NCis based on a stand-alone, fast processor, the acceleration ramps and signal outputs for the axes are calculated independently. The 32bit processor with 8 cores is extremely powerful.

Stepping frequencies of up to 1.6 MHz per axis

Stepping frequencies of up to 1.6 MHz per axis


Per axis stepping frequencies of up to 1.6 MHz (1600 kHz) can be output, thus there is no limit for high-precision and extremely fast servo drives. The processor calculates independently braking and acceleration ramps. If the connection to the control computer fails, the machine brakes in a controlled manner and waits until the connection can be reestablished.

Even pulling out the network cable or switching off the control computer (power failure) do not disturb the machine. The instrument and parts remain protected, the position of the machine is maintained, and the processing can be continued at any time.

Conclusion: only a separate processor, independent of the control PC, is reliable.


3. Signal form and power amplifiers, jitters and lost steps

Most of the control systems on the market do not use dynamically calculated braking and acceleration ramps, but fixed specifications. This leads to vibrations, resonances and jerky movements. The pulse output is frequency-dependent, that is, the pulses are not always the same. Directional changes are not always output 100% synchronously with the clock signals.

As a result, the engines can sometimes “forget” a step or they jitter and the motors run unclean.
The KinetiC-NC calculates the braking ramps every time, outputs the signals with frequency-independent precision, the clock ratio is always 50%. Change of direction is always performed precisely and exactly.

So there are no jitters and steps cannot be “forgotten”. The engines run smoothly and have more torque. Absolutely no setting up or adjustment to power amplifiers from different manufacturers is necessary.

Conclusion: thanks to its own processor, signals are output precisely and cleanly. This system is unique among the well-known step-direction controllers.


4. Short-circuit protection

All KinetiC-NC signal outputs are short-circuit-proof. In contrast to many products on the market, the cnc pod cannot be destroyed by faulty cables, and the control PC is also protected if the machine has a defect.

Conclusion: increased security for the control PC and the connected hardware thanks to KinetiC-NC.


5. Plug & Play – it does not get any easier

All machines and accessories are preconfigured in the software. Simply select the machine you have purchased and get started. Nothing needs to be configured.

Conclusion: high productivity thanks to KinetiC-NC and without a long trial!