Ncu Link; Introduction - Siemens SINUMERIK 840D sl Function Manual

Several Operator Panels on Several NCUs, Distributed Systems (B3)

2.5 NCU link

2.5 NCU link
2.5.1

Introduction

The number of channels or axes per NCU is restricted due to the limitation on memory and
computing capacity elements. A single NCU is not sufficient to fulfill the requirements made
by complex and distributed machines, such as multi-spindle and rotary indexing machines.
For this reason, the control system and closed-loop axis controls are distributed among
several NCUs.
In order to ensure, however, that channels and axes can continue to operate on an
interrelated, cross-NCU basis, the system provides NCU link functionality.
Function extensions
The following applications are possible:
● Cross-NCU interpolation (coupling of setpoints, actual values and VDI signals)
● Real exchange of axes
● Cross-NCU access to axis values and axial system variables
● NCU-user communication supported by NCU link variables
● Generation of alarms on the NCU affected by an irregularity, even if the cause of the
134
problem is on another NCU.
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions