Siemens SINUMERIK 840D Operating Manual page 562

Ladder Viewer and Ladder add-on (828D only)
19.3 Control options
Shortcuts
-or-
562
Action
To the last field of the last network
Open the next program block in the same window
Open the previous program block in the same window
The function of the Select key depends on the position of the input
focus.
Table line: Displays the complete text line

Network title: Displays the network comment

Command: Displays all operands

If the input focus is positioned on a command, all operands including
the comments are displayed.
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
Milling