NTCF22 CPU module PLC controller stock
Technical data of product parameters
For an unbalanced source, the ground shield should be connected to the source common or ground NTCF22
at the source end. If all of the source inputs to this module come from the same location and are
referenced to the same common, all shield grounds should be connected to the same physical
ground point. If using a terminal strip between the analog input module and the field devices NTCF22
(analog sources), use the method in the following figure for “continuing” each cable shield
using a terminal on the terminal strip. Note that each cable is only grounded at one end – the
end closer to the field devices (analog sources). Shield connections are shown in bold in the next
figure.In some applications, improved noise rejection can be obtained by connecting the source common
points together at the source end, and then connecting a common line to the module at only one NTCF22
module COM terminal. This scheme will eliminate multiple grounding or ground loops that could
cause false input data. In the following figure, the common connections just described are drawn in
bold linesIf using the method in the previous example, you may need to improve noise immunity. To
accomplish this, a conductor may be used to connect the applicable ground terminal on the NTCF22
module’s terminal board to earth ground. This additional connection will bypass noise around
the module. The next figure shows the same shield grounding scheme as in the previous figure,
but with the addion of the external ground connection just described, shown with bold lines.
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