Owner's manual

2-26
IM MX180-01E
Setting the Reference Channel for Difference 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.
Setting the Remote RJC Reference Channel (Valid 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 exi
sting on the
measurement channel tab) with the Monitor check box selected.
• The range of the reference channel and that of the correspond
ing measurement
channel are the same.
Setting the Time Constant of the First-Order Lag Filter (Valid Only When
the Input Mode Is Set to Something 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 Time 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 Setting the Measurement Conditions (Setting the Measurement Channels)