1166 HEIDENHAIN Technical Manual MANUALplus 620
The following general data is displayed in the bottom display line:
 Connected: Indicates the software or function area to which the OLM is 
connected
•Ipo
•SimIpo
•PLC6
• none: No connection
 IpoCounter: Counts the IPO clock pulses
Note: The contents of the IpoCounter are also stored for trace information 
and error messages.
 Ax/Chn-Number: Logical axis number or channel number (depends on the 
selected function)
• Number at left: Left column
• Number at right: Right column
If the number of variables displayed exceeds the capacity of the main window, 
use PageDown/PageUp to scroll to the next/previous group of variables. One 
group consists of eight displayed variables.
Units The OLM displays data in the following units:
 Linear axes
• For position, length, etc: in [mm]
• For speed: in [mm/s]
• For acceleration: in [mm/s
2
]
 Rotary axes (spindles)
• For position, etc: in [°]
• For speed: in [°/s]
• For acceleration: in [°/s
2
]
Selecting axes and 
channels
To select axes or channels, proceed as follows:
 Press CTRL + UP ARROW / DOWN ARROW to influence the left column.
• CTRL + UP ARROW: Display the next axis/channel.
• CTRL + DOWN ARROW: Display the previous axis/channel.
 Press ALT + UP ARROW / DOWN ARROW to influence the right column.
• ALT + UP ARROW: Display the next axis/channel.
• ALT + DOWN ARROW: Display the previous axis/channel.
 Press UP ARROW / DOWN ARROW (without CTRL or ALT) to influence 
both columns.
• UP ARROW: Display the next axes/channels.
• DOWN ARROW: Display the previous axes/channels.