Rockwell Automation 1440-SPD02-01RB XM-220 Dual Speed Module - Manual (Page 114)

Publication GMSI10-UM004B-EN-P - May 2010
106 DeviceNet Objects
Tachometer Channel Object
(Class ID 326
H
)
The Tachometer Channel Object models "front end" processing performed
on a tachometer signal before specific measurements are performed.
Class Attributes
The Tachometer Channel Object provides no class attributes.
Instances
There are 2 instances of this object.
Instance Attributes
Table C.38 Tachometer Channel Object Instance Attributes
Attr ID
Access
Rule
Name Data Type Description Semantics
3 Get/Set Number of
Pulses per
Revolution UINT The number of signal
pulses per revolution of
the shaft (number of gear
teeth). 0 = Tachometer disabled
> 0 = Tachometer enabled
4 Get/Set Auto Trigger BOOL Indicates whether the
trigger level is determined
automatically from the
signal. 0 = Use specified Trigger Level
and Hysteresis
1 = Determine trigger level and
hysteresis automatically
5 Get/Set Trigger Level REAL The signal level to be
used as the trigger. Volts
6 Get/Set Trigger Slope USINT The slope of the signal at
the threshold crossing to
be used as the trigger. 0 = Positive
1 = Negative
7 Get/Set Trigger
Hysteresis REAL The amount of hysteresis
around the trigger level. In Auto Trigger mode, this
value is a percentage of the
peak-to-peak input signal and
can range from 0 to 50%. In
Manual Trigger mode, this
value is a voltage level (the
hysteresis voltage is added or
subtracted to the threshold
voltage to determine the
hysteresis range).