Rockwell Automation 1440-VLF02-01RA XM-121 Absolute Shaft Module - Manual (Page 135)

Publication GMSI10-UM014D-EN-P - May 2010
DeviceNet Objects 127
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.
Instance Attributes
Table C.51 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).
8 Get/Set Name STRING2 A name to help identify
this channel. 18 characters maximum
9 Get/Set Multiplier REAL A multiplier applied to the
tachometer pulse rate. > 0
10 Get/Set Fault Time-out USINT Number of seconds with
no pulses before a Tach
Fault is indicated. 1 to 64 seconds