Rockwell Automation 1734-IT2I Thermocouple and RTD Input Module User Manual - Manual (Page 42)

Publication 1734-UM004F-EN-E - December 2012
32 Configure Your Module
Advanced Setup Parameters
Advanced parameters you can set for the RTD module consist of:
• Notch filter – Select the Notch Filter for the analog to digital converter.
At higher frequencies, faster sample rates are possible
– 50 Hz
– 60 Hz (default)
– 100 Hz
– 120 Hz
– 200 Hz
– 240 Hz
– 300 Hz
– 400 Hz
– 480 Hz
If the filter value is changed, the module may require calibration to meet
specifications.
• Digital filter – A digital filter is available on this module. You set a time
constant that is used in the equation:
Yn = Yn-1 + (dt / (dt + T
A
) * (Xn-Yn-1)
Where: Yn = new data
Yn-1 = old data
dt = Channel Update Rate in milliseconds
T
A
= digital filter time constant
Xn = present unfiltered data
T
A
can be an integer from 0 to 10,000 ms. If set to 0, the filter is
disabled.
• Enable alarms latch – If enabled, alarms for this channel latch
FAULTED until a Latch Reset command is received.
The alarms effected are:
– Input Status
– Low and High level
– Range
• Disable alarms – If Alarms are Disabled, all alarms for this channel
show No FAULT. This is useful for unused channels.
• Level alarms – low-low, low, high, and high-high.