Siemens SINUMERIK 840D sl Operating Manual page 640

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Table of Contents

Alarms, error messages, and system alarms

21.5 PLC and NC variables

Notation for variables

● PLC variables

● NC variables

NC system variables and PLC variables

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

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

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

Changing PLC variables

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

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

– NC system variables - notation

– User variables/GUDs - notation

GUD/MyVariable[1,3]

– OPI - notation

/CHANNEL/PARAMETER/R[u1,2]

the values from the corresponding channel are displayed.

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.

exception of GUDs).

Operating Manual, 09/2011, 6FC5398-7CP40-2BA0

Sinumerik 828d