Communications Principle - Siemens sinumerik 840d sl Configuration Manual

Introduction

1.3 Communications principle

1.3 Communications principle
Overview
A SINUMERIK NCU includes the integrated subcomponents PLC and NCK. WinCC uses
different communication drivers to access these subcomponents.
● PLC
– Behaves like an S7-300 controller in respect to data communication.
– Uses the communication driver "SIMATIC S7-300/400".
● NCK
– Requires special tag descriptions and specific services.
– Uses the communication driver "SINUMERIK NC". The "SINUMERIK NC"
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communication driver allows you to read/write NC tags and GUDs as well as to access
PI services.
SINUMERIK Integrate Create MyHMI / WinCC V13 SP1
Configuration Manual, 11/2014