Rockwell Automation 1440-VST02-01RA XM-120 Eccentricity Module - Manual (Page 40)

Publication GMSI10-UM010C-EN-P - May 2010
32 Installing the XM-120 Eccentricity Module
Connecting the 4-20 mA Outputs
The module includes an isolated 4-20 mA per channel output into a maximum
load of 300 ohms. The measurements that the 4-20 mA output tracks and the
signal levels that correspond to the 4 mA and 20 mA are configurable. Refer
to 4-20 mA Output Parameters on page 55 for details.
Wire the 4-20 mA outputs to the terminal base unit as shown in Figure 2.21.
Figure 2.21 4-20mA Output Connections
Serial Port Connection
The XM-120 includes a serial port connection that allows you to connect a PC
to it and configure the module’s parameters. There are two methods of
connecting an external device to the module’s serial port.
• Terminal Base Unit - There are three terminals on the terminal base
unit you can use for the serial port connection. They are TxD, RxD, and
RTN (terminals 7, 8, and 9, respectively). If these three terminals are
wired to a DB-9 female connector, then a standard RS-232 serial cable
with 9-pin (DB-9) connectors can be used to connect the module to a
PC (no null modem is required).
ATTENTION
The 4-20 mA outputs are functionally isolated from other
circuits. It is recommended that the outputs be grounded at
a single point. Connect the 4-20 mA (-) to the XM terminal
base (Chassis terminal) or directly to the DIN rail, or
ground the signal at the other equipment in the 4-20 mA
loop.
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