Rockwell Automation 1440-TB-A XM-940 Dynamic Measurement Terminal Base - Manual (Page 11)

XM-940 Dynamic Measurement Terminal Base 11
Publication GMSI10-IN020C-EN-P - October 2013
The grounding wire can be connected to the DIN rail by using a DIN Rail
Grounding Block (see illustration below).
DIN Rail Grounding Block
1 Use 8.4 mm 2 (8 AWG) wire.
24V Common Grounding
24V to the XM module must be grounded. When two or more power supplies
power the XM system, ground the 24V Commons at a single point, such as
the ground bus bar.
IMPORTANT
If it is not possible or practical to ground the -24V DC supply, then it is
possible for the system to be installed and operate ungrounded. However, if
installed ungrounded then the system must not be connected to a ground
through any other circuit unless that circuit is isolated externally.
Connecting a floating system to a non-isolated ground could result in
damage to the XM module(s) and/or any connected device. Also, operating
the system without a ground may result in the system not performing to the
published specifications regards measurement accuracy and
communications speed, distance or reliability.
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