A 03.04 AppendixB Terms A Siemens AG, 2004. All rights reservedSINUMERIK 840D/810D Operator's Guide HMI Embedded (BEM) – 03.04 Edition A-333MMachine Control operating areaMachine axes Axes which exist physically on the machine tool.Machine control panel An operator panel on a machine tool with operating elements such askeys, rotary switches etc. and simple indicators such as LEDs. It isused to control the machine tool directly via the PLC.Machine coordinatesystemSystem of coordinates based on the axes of the machine tool.Machine zero A fixed point on the machine tool, which can be referenced by all(derived) measuring systems.Machining channel Via a channel structure, parallel sequences of movements, such aspositioning a loading gantry during machining, can shortenunproductive times. Here, a CNC channel must be regarded as aseparate CNC control system with decoding, block preparation andinterpolation.Macro techniques Grouping of a set of instructions under a single identifier. The identifierin the program refers to the collected sequence of instructions.Main block A block prefixed by ":" containing all the parameters required to startexecution of a -> parts program.Main program Parts program identified by a number or identifier in which furthermain programs, subroutines or -> cycles may be called.Mains The term "network" describes the connection of several S7-300 andother terminal devices, e.g. a programming device, via ->interconnecting cables. A data exchange takes place over the networkbetween the connected devices.MDA Control operating mode: Manual Data Automatic. In MDA mode, it ispossible to enter individual program blocks or sequences of blockswithout reference to a main program or subroutine and to thenexecute them immediately via the NC start key.Measuring circuit • SINUMERIK FM-NC: The requisite control circuits for axes andspindles are integrated in the control module as standard. In total.a maximum of 4 axes and spindles can be realized, with amaximum of up to 2 spindles.• SINUMERIK 840D: The signals from the sensors are analyzed inthe SIMODRIVE 611D drive modules. The maximum configurationis 8 axes and spindles in total, with up to 5 spindles.
