Adc Alarm; Channel Scan Rate - Spectrum Controls Micro800 2085-IR8-SC User Manual

3-28 Chapter 3: Configuring the Micro800 Expansion I/O 2085-IR8-SC Using CCW
User's Manual Pub. 0300321-01 Rev. A
the Input Type low limit or less, the channel input reading is clamped at
that low limit value.
•
When the channel input reading is equal to or greater than the maximum
point of the selected Input Type range, the Channel Over Range status bit
and the Channel Fault bit are set. If the channel input reading reaches the
Input Type high limit or greater, the channel input reading is clamped at
the high limit value.
•
The channel Under or Over range status bits is cleared when the channel
input reading is greater than the minimum point or less than the
maximum point of the selected Input Type range.

3.6.11 ADC Alarm

When each input channel is acquiring its channel data in sequence on the
corresponding ADC measurement circuit, to ensure the validity of the data
reading, the ADC and PGA IDs and the signal reading are validated for reporting
potential acquisition failure in time.
If there is a communication failure, the channel ADC Fault bit and the Channel
Fault bit are set in the input table. This can happen when the ESD environment is
out of the hardware specification tolerance or the hardware connection on the
ADC and PGA component is damaged.
To clear the fault bit, cycle power the module. If the fault fails to clear, please
send the module back to Spectrum Controls for further

3.6.12 Channel Scan Rate

The module scan rate can be determined by adding up the scan time of each
individual channel connected to the pair of the ADC and PGA measurement
circuitry. The module has one pair of the ADC and PGA measurement circuitry
with 8 channels grouped.
The channel scan time is based on each channel's Input ADC Filter configuration,
and is the sum of the multiplexer settling time, PGA register setup time, ADC
conversion period (which is 2/filter + 1 ms), and microcontroller processing
overhead.
On the channel that has the open circuit detection feature enabled, the module
performs one regular measurement on channel input, and another measurement
on open circuit check when the OC timer expires. The channel scan rate may
vary.
inspection.