July 2013 8.1 Display and operation 1149
Position display for
rotary axes and PLC
auxiliary axes
For these axes you can set the modulo value for the counting mode (i.e. the
value after which the axis display returns to zero). The software limit switches
become inactive when the modulo counting mode is activated.
However, for the modulo counting mode you can activate software limit
switches for a traverse-range limit (e.g. 10 to 180 in MP91x.x or 92x.x) via
MP812. This traverse-range limit cannot be restricted additionally in the
manual operating mode.
When using encoders with distance-coded reference marks (MP1350), you
can define a traverse range of more than 360° for rotary axes with limit
switches (e.g. ± 190 degrees). When the machine is switched off, the position
is stored by the control. This enables the control to ascertain whether the axis
is, for example, at a position of –1° or +359° after the machine is switched
back on.
Select the display mode with MP810.x.
Activate or deactivate the software limit switches with MP812.
Rotary axes with modulo display can be positioned either without crossing
zero or always along the shortest path:
Select the type of positioning with MP7682.
• For bit 2=0: Programming with M126
• For bit 2=1: You need not program with M126.
Furthermore, based on the settings in MP810.x, the control detects whether
the PLC axis is a rotary axis:
• MP810.x ≠ 0: PLC axis is a rotary axis
MP810.x Display mode for rotary axes and PLC auxiliary axes
Input: 0.0000 to 99 999.9999 [°]
0: Display +/–99 999.9999
≠ 0: Modulo value for display
MP812 Activate software limit switches for rotary axes with
modulo display, M94 and encoders with EnDat interface
Input: %xxxxxxxxxxxxxxxxxx
Bits 0 to 17 represent axes 1 to 18
0: Software limit switch not active
1: Software limit switch active
MP7682 Machine parameter with multiple function
Input: Bit 2 – Traverse path of rotary axes with modulo display
0: Positioning without passing over zero
1: Positioning on the shortest path
Please note that the traverse-range limits set earlier in the manual operating
mode also become active in the modulo counting mode when MP812.x is
set. However, these can no longer be edited or viewed in the manual
operating mode.
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