Yokogawa DR240 - Manual (Page 248)

14-3 IM DR232-01E
Specifications
14
14.1 Specifications of DR232/DR242 and DS400/DS600
Other functions
Manual printout: One scan’s worth of data can be digitally printed by a key operation or
eventlaction function.
Zone recording: Recording width and recording positions (0% and 100% positions) can be set in
mm units for each channel in case of dot recording.
Partial compression: A part of the amplitude can be compressed in case of dot recording (only one
boundary).
Display
Display method
VFD (5
× 7 dot matrix, 3 rows)
Number of characters
Main display: 22 large characters (1 row); Sub-display 1 and 2: 40 small characters (2 rows)
Displayed contents
Digital value display: data for freely selected channels can be displayed on each row (1 channel
per line, max. 5 rows); channel No. or tag (up to 7 characters); alarm search; measurement values;
engineering unit
Bargraph display: measurement data of the main display are displayed as a bargraph
Auxiliary data: clock, alarm status, alarm relay status, logging ON/OFF, recorder operation
Alarms (when equipped with Alarm module)
Number of settings
Up to four alarms can be set for each channel.
Kind of alarms: selection from higher limit, lower limit, difference higher limit, difference lower
limit, higher limit on rate of change, lower limit on rate of change.
Rate of change alarm time interval: Can be set to measurement interval
× 1 to 15 (common to
both rising and falling limits).
Output mode
Energize/de-energize setting, AND/OR mode setting, and output hold/non-hold setting can be
made (common to all channels).
A maximum number of 6 reflash alarm output points can be specified.
Number of alarm output points
Max. 300 at sub-units (up to 300 can be achieved by increasing the number of alarm modules)
Max. number of alarm modules
Up to 6 modules can be connected to a sub-unit (4 in case of DS400); by increasing the number of
sub-units, up to 30 modules can be connected.
Alarm recording
Analog trend mode:The occurrence/release mark, channel number or tag, kind of alarm, and alarm
item number are printed in the right margin.
Logging mode:
The kind of alarm is printed when the measurement data are recorded.
Alarm display
Alarm status indication: Lights or flashes when an alarm is detected.
Alarm acknowledge indication: Indicator stops flashing by key operation.
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.