Rockwell Automation 1440-SDM02-01RA XM-124 Standard Dynamic Measurement Module - Manuel (Page 153)

Rockwell Automation Publication 1440-UM001C-EN-P - May 2014 153
CIP Objects Appendix B
Class Attributes
The Tachometer Channel Object provides no class attributes.
Instance Attributes
Services
(1) Attributes can only be set while the device is in Program mode. See the description of the Device Mode Object for more information.
Table 77 - 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 (for
example 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, Trigger
Slope, and Hysteresis
1 = Automatically determine trigger level
and trigger slope, and use the specified
Hysteresis
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
10 Get/Set Fault Time-out USINT Number of seconds with no pulses
before a Tach Fault is indicated
unless Zero Pulse Fault Inhibit
is set to 1. 1…64 seconds
11 Get/Set Zero Pulse Fault
Inhibit BOOL Lack of Tach Pulses does not cause
a Tach Fault. 0 = A lack of tach pulses constitutes a Tach
Fault
1 = A lack of tach pulses does not
constitute a Tach Fault
Table 78 - Tachometer Channel Object Services
Service Code
Class/Instance Usage Name Description
0E
h
Instance Get_Attribute_Single Returns a single attribute.
10
h
Instance Set_Attribute_Single Sets a single attribute.
(1)