Rockwell Automation 1440-TPS02-01RB XM-320 Position Module - Manual (Page 59)

Publication GMSI10-UM005C-EN-P - May 2010
Configuration Parameters 51
Head-To-Head Mode
The head-to-head mode allows extended range operation by using two probes
in a “back to back” arrangement shown in the illustration in Figure 3.2. This
mode can be used when the machine does not have enough space for larger
diameter probes. It is not necessary for the scales to be symmetrical in this
mode, and probes of different voltage sensitivities can be used within the one
module.
Figure 3.2 Head-to-Head Mode
In head-to-head mode, the XM-320 provides monitoring facilities for
complementary differential expansion measurements.
Head-to-Head Example
This head-to-head application measures a total displacement of 1000 mils on a
shaft collar using two 500 mil probes with a standard sensitivity of 30mV/mil
(or 0.030V/mil). See Figure 3.3.
TIP
In head-to-head mode, all position measurements are
stored in channel 1.
HEAD TO HEAD MODE
(one target)
(two targets)