Yokogawa Button Operated DX2000 - Manual (Page 26)

1-15
IM 04L42B01-01E
Overview of Functions
1
2
3
4
5
6
7
8
9
10
11
12
13
App
Index
Digital Display
Displays the measured data numerically using large numbers. For the operating
procedure, see section 4.2.
Unit
Tag or channel numbers
Alarm mark
Measured value
Note
• Numeric display of measurement channels
If a measured value of a measurement channel is over range (see below), the measured
value is indicated as “+Over” or “–Over.” If a burnout is detected on a channel whose
burnout detection function is enabled, the word “Burnout” is indicated. Otherwise, a numeric
value is displayed.
Over range of measurement channels
• For DC voltage input, over range occurs when the measured value of the measurement
channel exceeds ±5% of the measurable range. For example, the measurable range when
the measurement range is 2 V is –2.000 to 2.000 V. If the measured value exceeds 2.200 V,
+ over range occurs; if the measured value falls below –2.200 V, – over range occurs.
• For thermocouple or RTD input, over range occurs when the measured value exceeds
approximately ±10°C of the measurable range. For example, the measurable range
when the measurement range is R is 0.0 to 1760.0°C. If the measured value exceeds
approximately 1770.0°C, + over range occurs; if the measured value falls below
approximately –10.0°C, – over range occurs.
• For channels that are linearly scaled, + over range occurs when the value exceeds 30000
excluding the decimal point; – over range occurs when the value falls below –30000.
However, + over range can be changed to greater than or equal to 105% of the scale width
and – over range to less than or equal to –5% of the scale width within ±30000.
For the
setting procedure, see section 3.11.
• Numeric display of computation channels
See section 1.8, “Computation and Report Function (/M1 and /PM1 Options)
• Numeric display of external input channels (/MC1 option)
The numeric range that can be displayed is –30000 to 30000 excluding the decimal point.
The decimal place corresponds to the decimal place of the lower limit of span of the external
input channel. On the numeric display, values are displayed if the value is within the –30000
to 30000 range regardless of the upper and lower limits of span.
If the value exceeds 30000, + over range occurs; if the value falls below –30000, – over
range occurs.
• Alarm Indication
Alarm mark and measured value are displayed as follows according to the alarm
status. When you use the alarm annunciator function (release number 3 or later), the
alarm mark follows the annunciator sequence.
Alarm
Release
Alarm ACK Alarm ACK
Occurrence
When indication is
set to non-hold
When indication
is set to hold
Red Blue Red Blue Red Red Blue Blue Blue Blue Blue Measured
value
Blinking
red
Blinking
green
Blinking
red
Green Red Red Green Green Green Green Green Alarm mark
1.3 Display