Design Of The Control - Siemens SINUMERIK 840C Operator's Manual

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Design of the control

NCK
Setpoints/actual values
for axes and spindles
Fig. 1-1 Structure of SINUMERIK 840C
NCK
PLC
MMC=PC
© Siemens AG 1999 All Rights Reserved
SINUMERIK 840C, OEM Version for Windows (BA)
1 Introduction - SINUMERIK 840C and its Operation
Structurally, the SINUMERIK 840C CNC can be divided into the following
three components:
MMC
The three components perform the following functions:
The main task of the NCK (NC kernel) is to convert the program blocks of a
part program into the traversing movements on the axes. Allowance must be
made for all the required compensating values such as tool offsets, zero offsets,
etc.
The PLC mainly performs simple control and monitoring tasks. The PLC
program must assure the smooth execution of all machine functions without
endangering man or machine.
A PC has been integrated in the SINUMERIK 840C CNC for MMC (Man
Machine Communication). In addition to data management tasks, this PC
performs functions related mainly to the transfer and visualization of data
exchanged between the NCK, PLC, MMC and operator. This PC runs under
the MS-Windows operating system.
SIEMENS
M
PLC
Machine control
input/output
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SINUMERIK
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