Spectrum Controls 1734sc-IE2CH - Manual (Page 34)

3-12 Point IO™ 2/4 Channel Analog HART Module
User’s Manual Pub. 0300257-01 Rev. A
High Engineering
The maximum scaled value that will be displayed when the analog input signal is at 20
mA. This feature is applied on a per channel basis.
Digital Filter
The digital filter smoothes input data noise transients. This feature is applied on a per
channel basis. The digital filter value specifies the time constant for a digital first order
lag filter on the input data. A value of 0 disables the filter.
The digital filter equation is a classic first order lag equation.
Yn = Filtered Input Value
Yprevn = Previous Filtered Input Value
Tdelta = Change in time(msec)
TA = User supplied Time Constant(msec)
Xn = new unfiltered input value
Yn = Yprevn + ( (Tdelta/ (Tdelta + TA)) * (Xn – Yprevn) )
Value Units: Milliseconds
Value Limits: 0-20100, if not 0(feature disabled) then value must be greater than 2 * RTS
Value else Configuration Error
Low Alarm
A low alarm will activate if the value of the scaled input is at or below this value. It will
clear (if not latched) when the scaled input rises above this value.
High Alarm
A high alarm will activate if the value of the scaled input is at or above this value. It will
clear (if not latched) when the scaled input drops below this value.
Low-Low Alarm
A low-low alarm will activate if the value of the scaled input is at or below this value. It
will clear (if not latched) when the scaled input rises above this value.
High-High Alarm
A high-high alarm will activate if the value of the scaled input is at or above this value. It
will clear (if not latched) when the scaled input drops below this value.
Reserved (set to zero)
Alarm Latch
0: Process alarms are not latched for associated channel.
1: Process alarms are latched for associated channel.