Siemens SINUMERIK 840D sl Function Manual page 167

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Link communication

Link variables

Complex systems often feature multiple NCUs, each with multiple channels. Each NCU has

a link communication channel for the purpose of coordinating manufacturing processes

throughout the entire system. Using this, each of the NCUs can exchange data cyclically with

every other NCU in the link grouping.

The link communication channel is based on a memory area on each NCU known as the link

variables memory. The user/machine manufacturer can define both the size and data

structure of the link variables memory on a system-specific basis. The data stored in the link

variables memory is addressed by what are known as link variables;

these are system-global user variables which can be read and written in part programs and

cycles by all NCUs involved in a link grouping if link communication has been configured.

Unlike global user variables (GUD), link variables can also be used in synchronized actions.

On systems without an NCU link, link variables can be used as additional global user

variables alongside standard global user variables (GUD).

Requirements

The following requirements must be met in order to use link variables for cross-NCU data

● The link grouping must be installed and configured. See "Configuration of a link grouping

● Link communication must be activated:

Extended Functions

Function Manual, 03/2009, 6FC5397-1BP10-4BA0

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

(Page 174)".

MD18780 $MN_MM_NCU_LINK_MASK (activation of NCU link communication)

Link communication

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