Siemens SINUMERIK 840D Operating Manual page 584

Alarms, error messages, and system alarms
20.4 PLC and NC variables
Note
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
machine.
Changing and deleting values
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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).
DANGER
1. Select the "Diagnostics" operating area.
2. Press the "NC/PLC variab." softkey.
The "NC/PLC variables" window opens.
3. Position the cursor in the "Variable" column and enter the required
variable.
4. Press the <INPUT> key.
The operand is displayed with the value.
5. Press the "Details" softkey.
The "NC/PLC variables: Details" window opens. The information for
"Variable", "Comment" and "Value" are displayed in the full length.
6. Position the cursor in the "Format" field and choose the required
format with <SELECT>.
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
Milling