Rockwell Automation 1440-VLF02-01RA XM-121 Absolute Shaft Module - Manual (Page 10)

Publication GMSI10-UM014D-EN-P - May 2010
2 Introduction
It can operate stand-alone, or it can be deployed on a standard or dedicated
DeviceNet network where it can provide real-time data and status information
to other XM modules, PLCs, distributed control systems (DCS), and
Condition Monitoring Systems.
The Absolute Shaft module can be configured remotely via the DeviceNet
network, or locally using a serial connection to a PC or laptop. Refer to
Chapter 3 for a list of the configuration parameters.
Absolute Shaft Module
Components The Absolute Shaft module consists of a terminal base unit and an instrument
module. The XM-121 Low Frequency Dynamic Measurement Module and the
XM-940 Terminal Base are shown below.
Figure 1.1 Absolute Shaft Module Components
• XM-940 Dynamic Measurement Module Terminal Base - A DIN rail
mounted base unit that provides terminations for all field wiring
required by XM Dynamic Measurement and Absolute Shaft modules.
• XM-121 Low Frequency Dynamic Measurement Module - The XM-121
mounts on the XM-940 terminal base via a keyswitch and a 96-pin
connector. The XM-121 contains the measurement electronics,
processors, relay, and serial interface port for local configuration.
LF DYNAMIC MEASUREMENT 1440-VLF02-01RA
XM-940 Dynamic Measurement Module Terminal Base Unit
Cat. No. 1440-TB-A
XM-121 Low Frequency Dynamic
Measurement Module
Cat. No. 1440-VLF02-01RA
IMPORTANT
The XM-441 Expansion Relay module may be connected
to the XM-121 module via the XM-940 terminal base.
When connected to the module, the Expansion Relay
module simply “expands” the capability of the XM-121 by
adding four additional epoxy-sealed relays. The module
controls the Expansion Relay module by extending to it the
same logic and functional controls as the on-board relay.