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Shifting Input Values Section 4-1
4-1 Shifting Input Values
4-1-1 Shifting Input
• The measurement value calculated by the sensor is normally the same as
the actual PV. An input shift can be applied if the measurement value
requires shifting.
• Two types of input shift can be used. A one-point shift is used to simply
shift the measurement value. For a two-point shift, the shift amount for the
lower limit and upper limit are set separately and both the measurement
values and the slope are shifted.
One-point Shift: • With a one-point shift, the value set for the “Temperature input shift”
parameter is applied to the entire temperature input range. For example, if
the input shift value is set to 1.2°C and the measurement value is 200°C,
the PV will be stored as 201.2°C after the input shift has been applied.
• Default for both ch1 and ch2 is 0.
Two-point Shift: • The shift amount and slope can be shifted by setting different shift values
for the upper and lower limits of the sensor range. Setting different shift
values means that the slope of the line will change. For example, if the
upper limit is set to “2°C” and the lower limit is set to “1°C,” the sensor
range is shifted by 1.5°C at a 50% input.
• Set the upper limit in the “upper limit temperature input shift value” param-
eter and the lower limit in the “lower limit temperature input shift value”
parameter.
• The default for the upper and lower limit temperature input shift values is
0 for both ch1 and ch2.
• A two-point shift is supported by the following models.
Upgraded pulse output models and analog output models:
Input type = Platinum-resistance thermometer, thermocouple,
infrared temperature sensor
Previous pulse output models:
Input type = Infrared temperature sensor
Temperature
Upper limit
After shift
Before shift
Input shift value
Input
100% FS
0
Temperature
Upper limit
After shift
Before shift
Input
100% FS
Lower limit
0
Lower limit temperature input
shift value
Upper limit temperature input shift value
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