Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 108)

1-96
IM 04L31A01-01E
Operation during Power Failures
If a power disruption occurred while the report function was in progress, the report
function will resume after the power is restored. The exact operation will vary depending
on whether the power is restored before or after the scheduled time to create a report.
Time of Recovery Port Operation
After the time to create the report Report data is created immediately after power is restored. The
measured/computed data up to the time of the power disruption is used.
For the next scheduled report, data after the power recovery are used.
Before the time to create the report After power is restored, report data are created at the time of the next
normally scheduled report. The measured/computed data excluding
the power disruption period is used.
Handling of Abnormal Data
Handling of the measured/computed data containing abnormal values is as follows.
Type of Abnormal Data Report Data
Average Value
Maximum/Minimum Value Sum Value
Positive over * Not used Used Not used
Negative over * Not used Used Not used
Error Not used Not used Not used
* “Over range” for measurement channels or “computation overflow” for computation channels.
Status
If the data of a measurement or a computation channel enters any of the conditions
listed below within the relevant time period (one hour for hourly reports and one day for
daily reports, for example), status is output to the report.
Data Condition Status
Common to measurement and computation channels
Measurement error or computation error
E
For measurement channels
Positive (+) over range
O
Negative (–) over range O
When the input type is voltage, over range occurs when the measured value exceeds the
measurable range of ±5%.
Suppose the measurement range is 2 V, and the measurable range is –2.000 to 2.000 V. If the
measured value exceeds 2.200 V, positive over range results; if the measured value falls below –
2.200 V, negative over range results.
If the input type is TC (thermocouple) or RTD (resistance temperature detector), over range occurs when the
measured value exceeds approximately ±10°C of the measurable range. Suppose the measurement range
is R, and the measurable range is 0.0 to 1760.0 °C. If the measured value exceeds 1770.0 °C, positive over
range results; if the measured value falls below –10.0 °C, negative over range results.
For computation channels
Positive (+) computation overflow (when the value exceeds 3.4E + 38)
O
Negative (–) computation overflow (when the value falls below –3.4E + 38) O
Power failure/Time change Status
When a power failure occurs P
When the time is changed C
1.18 Computation and Report Functions (Option)