Rockwell Automation 1440-SPD02-01RB XM-220 Dual Speed Module - Manual (Page 54)

Publication GMSI10-UM004B-EN-P - May 2010
46 Configuration Parameters
Measurement Mode
Parameter The Measurement Mode parameter controls how the two sensors are used to
calculate the speed, acceleration, and peak measurements. The XM-220
module operates in three different modes:
• Dual Channel - This is the default mode. The two sensors are used
independently to perform two separate sets of speed, acceleration, and
peak speed measurements.
• Single Redundant Channel - One of the two sensors is used to
perform the speed, acceleration, and peak speed measurements. The
module automatically switches to the other (redundant) sensor when a
transducer or tachometer fault is detected on the current sensor (and
there are no faults on the second sensor).
The Speed, Acceleration, and Peak Speed measurements are measured
only on channel 1. Channel 2 measurements (Speed, Acceleration, and
Peak Speed) are not measured.
• Reverse Rotation - The two sensors are used to monitor both speed
and direction. The two sensors must be mounted out of phase from
each other so that the rotational direction can be determined by
monitoring which sensor the shaft keyway passes first. Refer to Sensor
Placement for Reverse Rotation on page 35.
Channel 1 measures the Speed, Acceleration, and Peak Speed in the
forward direction. Channel 2 measures the Speed, Acceleration, and
Peak Speed in the reverse direction.
Measurement Mode Parameter
Parameter Name Description Values/Comments
Mode Controls how the two sensors are used to calculate
the speed, acceleration, and peak measurements.
See above for more details. Options: Dual Channel
Single Redundant Channel
Reverse Rotation