Yokogawa Removable Chassis DX1000N - Manual (Page 296)

12-2
IM 04L41B01-01E
Item Specifications
Thermocouple burnout* Burnout upscale/downscale selectable (for each channel).
Normal: 2 kΩ or less., Burnout: 100 kΩ or more (parallel capacitance of 0.01 µF or less)
Detection current: Approx. 10 µA
1-5 range burnout* Burnout upscale/downscale selectable (for each channel).
Burnout detection: Greater than “scale upper limit + 10% of scale width“ (upscale) ,or “
scale lower limit – less than 5% of scale width“ (downscale)
TC reference junction compensation
Internal reference junction compensation or external reference junction compensation
Filter function Takes the moving average of the input values (for each channel). Moving average data points: 2 to
400
Computation
Difference computation Computable range: DC voltage, TC, RTD, and DI
Linear scaling Computable range: DC voltage, TC, RTD, and DI
Scalable range: –30000 to 30000. The decimal place is within 4 digits to the right
of the decimal point.
Unit: 6 digits or less
Over value detection: The value can be set to over value when ±5% of the scale range
is exceeded.
Square root computation Takes the square root of the input and apply linear scaling
Computable type: DC voltage
Scalable range and unit: Same as linear scaling
Low-cut: Set the low-cut value in the range of 0.0% to 5.0% of the span.
Over value detection: Same as linear scaling
1-5V Computable range: 1-5
Scalable range and unit: Same as linear scaling
Low-cut: The low-cut point is fixed to the span lower limit.
Over value detection: Same as linear scaling
* In fast sampling mode, burnouts on all measurement channels cannot be detected within a scan interval. Burnout may not be
detected until the number of measurements indicated below is carried out if measurement is started in a burnout condition or
after a burnout occurs.
DX1002, DX1004, DX1002N and DX1004N: Up to 4 measurements. DX1006, DX1012, DX1006N and DX1012N: Up to 2
measurements.
Alarms
Item Specifications
Number of alarms Up to four alarms (level) for each measurement channels
Levels and colors You can change the alarm colors and display order by setting priorities and colors for each alarm
(release number 3 or later).
The alarm level and color settings are shared by all channels.
Alarm type High limit, low limit, difference high limit, difference low limit, high limit on rate-of-change alarm, low
limit on rate-of-change alarm, delay high limit, and delay low limit
Alarm delay time 1 to 3600 s (for each channel)
Rate-of-change calculation interval of rate-of-change alarms
1 to 32 times the scan interval (common to all channels)
Alarm output Output to the internal switch
Number of internal switches: 30
Internal switch operation: AND/OR operation selectable
Hysteresis High and low limit alarm: 0.0 to 5.0% of the span (common to all channels)
Difference high and low limit alarms: 0.0 to 5.0% of the span (common to all channels)
Display Displays the status on the respective operation screen and an alarm icon on the status display
section when an alarm occurs.
Display operation: Hold or not hold the display until the alarm acknowledge operation.
Alarm hide function (alarm no logging function)
Not display alarms nor record to the alarm summary (for each channel)
Alarm information Displays a log of alarm occurrences on the alarm summary.
Alarm Annunciator function (release number 3 or later)
Alarm displays and relay output operations can be made to follow an alarm sequence.
There are three supported alarm sequences: ISA-A-4, ISA-A, and ISA-M.
First-out display function: none
12.1 Signal Input and Alarm