Settng the reference channel for dfference input – Yokogawa PC-Based MX100 User Manual
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IM MX180-01E
Settng the Reference Channel for Dfference Input
Set this item when making the difference between the measured value of the channel
and the measured value of the reference channel the measured value (referred to as
difference computation). The reference channel can be set to a channel that is scaled.
Difference computation can be executed even if the measurement range of its own
channel and that of the reference channel are not the same.
If the decimal point position setting is different between its own channel and the reference
channel, the decimal point position of the measured value of the reference channel is
matched to that of its own channel, and the difference is computed.
Example: When the measured value of the channel set to difference input is 10.00 and
the measured value of the reference channel is 100.0
The computed result is 10.00 – 100.0 = –90.00.
Set the reference channel for difference input to a measurement channel that has the
Monitor check box selected.
Settng the Remote RJC Reference Channel (Vald Only When the Input
Mode Is Set to RRJC (TC)
This item sets the reference channel when the input mode is set to RRJC (TC).
Set the reference channel for remote RJC to a channel that meets the two conditions
below.
• The reference channel is a measurement channel (channel existing on the
measurement channel tab) with the Monitor check box selected.
• The range of the reference channel and that of the corresponding measurement
channel are the same.
Settng the Tme Constant of the Frst-Order Lag Flter (Vald Only When
the Input Mode Is Set to Somethng Other than DI)
A first-order lag filter is available. Select a time constant N (time until 63.2% of the output
value is reached) from the Filter list box for the case when the measurement interval
(Monitor interval in the settings) is set to 1 s. Time constants when the measurement
interval is set to a value other than 1 s follow the equation below.
Time constant = measurement interval × N (where N = 5, 10, 20, 25, 40, 50, or 100)
The table below lists the relationship.
Measurement
Interval (s)
Selectable Tme Constants (s)
0.01
0.05
0.1
0.2
0.25
0.4
0.5
1
0.05
0.25
0.5
1
1.25
2
2.5
5
0.1
0.5
1
2
2.5
4
5
10
0.2
1
2
4
5
8
10
20
0.5
2.5
5
10
12.5
20
25
50
1
5
10
20
25
40
50
100
2
10
20
40
50
80
100
200
5
25
50
100
125
200
250
500
10
50
100
200
250
400
500
1000
20
100
200
400
500
800
1000
2000
30
150
300
600
750
1200
1500
3000
60
300
600
1200
1500
2400
3000
6000
Input
63.2% of the output value
Output curve when
the filter is used
Time constant in the table above
2.4 Settng the Measurement Condtons (Settng the Measurement Channels)