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Settng the reference channel for dfference input – Yokogawa PC-Based MX100 User Manual

Page 40

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2-26

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)