Siemens SINUMERIK 828D Operating Manual page 792

Computerized numerical controller for machine tools

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Table of Contents

Alarm, error and system messages

14.6 PLC and NC variables

Notation for variables

● PLC variables

● NC variables

– NC system variables - notation

– User variables/GUDs - notation

– OPI - notation

NC system variables and PLC variables

• System variables can be dependent on the channel. When the channel is switched over,

the values from the corresponding channel are displayed.

• For user variables (GUDs) it is not necessary to make a specification according to global

or channel-specific GUDs. The indices of GUD arrays are, just like NC variables in the

system variable syntax, 0-based; this means that the first element starts with the index 0.

• Using the tooltip, for NC system variables, you can display the OPI notation (with the

exception of GUDs).

Changing PLC variables

Changes can only be made to the PLC variables with the appropriate password.

Incorrect parameterization

Changes in the states of NC/PLC variables have a major impact on the machine. Incorrect

configuration of the parameters can endanger human life and cause damage to the

GUD/MyVariable[1,3]

/CHANNEL/PARAMETER/R[u1,2]

Operating Manual, 01/2015, 6FC5398-8CP40-5BA2

Sinumerik 840d sl