Yokogawa DR240 - Manual (Page 215)

12-13 IM DR231-01E
Executing Computation (Available with the /M1 Model)
12
Displaying/recording in case of computation error (MATH ERROR)
Used to determine whether +OVER or -OVER be displayed/recording in case of computation
error.
Time axis scale for TLOG SUM (TLOG TIME SCALE)
For TLOG.SUM of time series, data is added at each measurement interval. However, in the case
of an input having unit of /s, /min or /h like flow rate, the computation result will differ from the
actual value, if addition of data is carried out. In this case, setting TLOG TIME SCALE
according to the unit of the input will cause the data measured at measurement intervals to be
processed according to the unit of the input.
For instance, if the measurement interval is 2s and input value is 100 m
3 /min, the computation
result will be 30000 after the elapse of one minute, since 100 is added every 2 seconds. Setting
TLOG TIME SCALE to /min will cause the measured data to be multiplied by 2s/60s at each
measurement interval, thus making the result close to the actual input value.
If this function is set to OFF, simple addition of data will be carried out.
Process of abnormal data during TLOG or CLOG (TLOG CH ERROR)
Used to select the process method for abnormal data obtained during TLOG or CLOG.
• ERROR : Abnormal data is processed as a computation error.
• SKIP
: Abnormal data is ignored and computation is continued.
Process of overflow data during TLOG or CLOG (TLOG CH OVER)
Used to select the process method for overflow data obtained during TLOG or CLOG.
• ERROR : Overflow data is processed as a computation error.
• SKIP
: Overflow data is ignored and computation is continued.
• LIMIT : Overflow data is treated as the next data for computation.
Measurement channels to which linear scaling is applied: Specified scaling upper-/
lower-limit
Measurement channels to which no linear scaling is applied: Upper-/lower-limit of
the measuring range
Computation channels: Specified LEFT/RIGHT value
Processing of the results of TLOG.PSUM computation
• OVER: If the result of a separate calculation of TLOG.PSUM (XXXX) exceeds 99999999, the
DR recorder goes into an overflow.
• ROTATE: If the result of a separate calculation of TLOG.PSUM (XXXX) exceeds 99999999,
the DR recorder resets the value subsequent to 99999999 to 0 and continues computing.
The process is effective only when a pulse input module is installed.
12.5 Setting Actions to be Carried out in Case of Computation Error and Setting the Time Axis for TLOG SUM