Adc Filters For Input Channels; Open Circuit Detection For Input Channels - Spectrum Controls Micro800 User Manual

3-28 Chapter 3: Configuring the 2085-IF4XOF4-SC Using CCW
Applicable for voltage measurement only
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User's Manual Pub. 0300307-01 Rev. A

3.7.6 ADC Filters for Input Channels

This configuration parameter allows you to select a filter setting that attenuates
the input signal beginning at the specified frequency. The actual filtering is
performed via module ADC:
Index Filter (Hz)
0 17
1 4
2 62
3 470

3.7.7 Open Circuit Detection for Input Channels

The Open Circuit setting options determine what value could indicate on the
Input Channel Status (AI_04:03) when a channel open circuit condition is
detected. There are four value reporting options for indication. Open Circuit
Detection options for input channels are provided in the following table:
Index Open Circuit Detection
0 Upscale
1 Downscale
2 Zero
3 Disable 16
With a 3-second MCU timer periodically running to detect channel open circuit
condition, if the input channel circuit is open on the terminal block, the Upscale
option refers to indicate the High Limit based on the configured Data Format and
Range Type selections, the Downscale option refers to indicate the Low Limit,
and the Zero option would report a zero.
If a sensitive low-impedance sensor is connected to the input channel circuitry,
applying open circuit detection circuitry may affect the accuracy on channel
measurement. By selecting the Disable option to disable the open circuit
detection, the channel measurement can avoid the detection impact, and the
channel open circuit status bit on the Input Channel Status (AI_04:03) is not
updated .
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Open Circuit conditions may display transitional data until an open circuit value
is reached. The channel reading may transition toward one of the Full Range
values until the open circuit value is detected. Once detected, the Upscale,
Downscale or Zero value is immediately set. Open circuit may also be triggered
by applying an input value well beyond the Low or High Limit values. The
values beyond the Low and High Limits are not specified since the function of
the Open Circuit Detection only applies to a disconnected input.
Open circuit detection for the Current measurement only applies to 4 to 20 mA
range type. If the signal wire to the channel terminal block is open or lower than
Note
Default
Note
Default