Yokogawa DA100 User Manual
Page 72
IM DA100-01E
4-3
4
Specifications
Standard Computation Functions
Computation functions
Difference between input channels, linear scaling, moving average
Scaling
ranges for which scaling can be set
: DC voltage, TC, RTD, contact
scaling range
: –30000 to +30000
Decimal point
: can be set freely
Measurement accuracy for scaling
: Measurement accuracy for scaling (digits) = Measurement
accuracy (digits) x Scaling span (digits) / Measurement
span (digits) + 2 digits (numbers below the decimal point
are discarded).
(Example)
measurement accuracy when the measured value is 5 V with the following settings: measurement
range: DCV 6 V, measurement span: 1.000 to 5.000 V, and scaling span: 0.000 to 2.000
±(0.05 Ч5+2)Ч2000/4000+2= ±3.125, measurement accuracy=
±4digits= ±0.004
Moving average
The moving average results for between 2 to 64 scans are computed.
Optional Math Function (/M1 option)
Computation types
Four arithmetical operations, SQR(square root), ABS(absolute value), LOG(common logarithm),
LN(natural logarithm), EXP(exponent), statistical computation*, logical computation (AND, OR,
NOT, and XOR), relational computation, exponentiation, previously-measured value reference,
hold**, and reset
* Statistical computation
CLOG: Computation process of simultaneously measured values within a group (total,
maximum, minimum, average, and maximum - minimum)
TLOG: Computation process of a specific channel over time axis (total, maximum, minimum,
average, and maximum - minimum)
Statistical computation interval: Set by the event/action function
* *Hold
Temporary suspending of computation and temporary hold of the computed result. During
statistical computation, resume the computation from the hold point after the hold is released.
Number of channels for computing (Number of channels that can be allocated for
computational purposes.)
Stand-alone type: 30ch maximum
Expandable type: 60ch maximum
Computation interval
Every measurement interval (except when the computation becomes too difficult to be processed
every measured interval, in which case an alarm is generated)
Significant digits during computation
10
308
Significant digits of the computed result
-9,999,999 to +99,999,999 (Decimal point can be set to have 1 to 4 digits on the right of the
decimal point)
Input from communication interface
Digital value (ASCII numerical array) input from the communication interface can be handled as
computational data
Computation start/stop
Can be controlled by communication commands and event/action function (such as remote
control signal, time specified, and alarm status)
Other functions included in the math function
Remote RJC
Input type: Thermocouple (TC)
Accuracy: (Twice the measurement accuracy of the standard thermocouple input) +
(temperature difference between the terminal of the remote terminal section and
thermocouple section for measuring the remote terminal temperature)
Thermocouple burnout: not selectable
Event/Action function
Can controll alarm ouput, timer and math executions with the alarm status, timer, etc.
4.1 DA100/ DS400/ DS600