Siemens SINUMERIK 840D sl Commissioning Manual page 313

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
machine.
Changing and deleting values
SINUMERIK Operate (IM9)
Commissioning Manual, 03/2013, 6FC5397-1DP40-3BA1
WARNING
1. Select the "Diagnostics" operating area.
2. Press the "NC/PLC variables" 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" is displayed in full length.
6. Position the cursor in the "Format" field and choose the required format
with <SELECT>.
7. Press the "Display comments" softkey.
The "Comments" column is displayed. You have the option of creating
comments or editing existing comments.
Press the "Display comments" softkey once again to hide the column.
8. Press the "Change" softkey if you would like to edit the value.
The "Value" column can be edited.
9. Press the "Insert variable" softkey if you wish to select a variable from a
list of all existing variables and insert this.
The "Select Variable" window opens.
Service and diagnostics
18.1 NC/PLC variables
307