Yokogawa DR240 - Manual (Page 236)

14-9 IM DR231-01E
Specifications
14
14.1 Specifications of DR130/DR231/DR241 (Style S3)
Standard Computation Functions
Kinds of computation
Difference between channels, linear scaling (scaling) and moving average.
Scaling
Scalable range: DC voltage, TC, RTD, contact
Scaling range: –30000 to +30000
Measurement accuracy for scaling: measurement accuracy for scaling (digits) = measurement
accuracy (digits)
× scaling span (digits) / measurement span (digits) + 2 digits. Numbers below
the decimal point are discarded.
(Example)
Measurement accuracy when the following settings are made:
Measuring range: 6 VDC, Measurement span: 1.000 to 5.000 V, Scaling span: 0.000 to 2.000,
Measured value: 5 V
+/-(0.05
Ч 5 + 2) Ч 2000/4000 + 2 = +/-3.125
Measurement accuracy = +/-4 digits = +/-0.004 V
Moving average
Moving average results for between 2 to 64 scans are computed.
Data Save/Load Function
Media for data save/load
Buffer memory (internal SRAM)
Capacity: 512 KB
Data backup: Around 10 years (backup with lithium battery, at room temperature while power
is off)
Specified data length: 10, 20, 30, 40, 50, 100, 200, 300, 400, 500, 1k, 2k, 3k, 4k, 5k, 10k, 20k,
30k, 40k, and 50k data/ch (Total memory lengt must be within the free memory size.)
3.5-inch floppy disk
Number of drives: 1
Disk types: 2HD, 2DD
Supported formats: 1.2 MB, 1.44 MB, and 720 KB
Applicable data
Setting values, measured values, and computed values (only possible whe optional math function
is specified)
Method to save to the floppy disk
Copies data stored in the buffer memory to the floppy disk, except for setting values which can be
directly saved to the floppy disk.
Method to load from floppy disk
Copies data from the floppy disk to the buffer memory except for settin values which can be
directly loaded from the floppy disk.
Printing and outputing loaded data
Able to print captured data saved in the buffer memory or output to a communication interface.
Data save format
Setting values: ASCII
Measured/computed values: binary (except ASCII (CSV Format) is also possible when saving to
floppy disk.)
Data capacity
Setting values
DR130 : Maximum about 42 KB (in case when saving the setting values of an operation mode
with 30ch inputs and 30ch computations.)
DR231/DR241 : Maximum about 50 KB (in case when saving the setting values of an
operation mode with 30ch inputs and 30ch computations.)
Measured values
Binary data: 2 bytes / 1 data
ASCII data: 12bytes / 1 data
Computed values
Binary data: 4 bytes / 1 data
ASCII data: 12 bytes / 1 data
Equation to calculate the total data capacity
256 + 64 × (number of measured ch + number of computation ch) + (number of measured ch ×
2 + number of computation ch Ч 4 + 6) Ч specified data length