How To Calculate Input Shift Values For A 2-Point Shift - Omron E5CN User Manual

Shifting Input Values
Two-point shift
Upper-limit
insh
Temperature
Input Shift Value
Lower-limit
insl
Temperature
Input Shift Value
4-1-2

How to Calculate Input Shift Values for a 2-point Shift

Preparations
1,2,3...
78
• Separate shift values can be set for the upper limit and lower limit of the
sensor input range for an infrared sensor as well as for a thermocouple or
platinum resistance thermometer with the Input Shift Type parameter set
to INS2. If different shift values are set for the upper limit and lower limit,
then the slope of the line will be different before and after applying the
input shift. For example, if the upper-limit value is set to 2 ° C and the
lower-limit value is set to 1 ° C, the input temperature will be shifted by
1.5 ° C for a 50% input, i.e., by the average of the upper-limit and lower-
limit values.
• Set the upper-limit value in the Upper-limit Temperature Input Shift Value
parameter and the lower-limit value in the Lower-limit Temperature Input
Shift Value parameter.
Temperature
Upper limit
After shifting
Lower limit
0
Lower-limit temperature
input shift value
When an ES1B Infrared Temperature Sensor is connected to the E5CN, an
offset of several degrees to several tens of a degree can occur.
For this reason, offset the readout value using a 1-point or 2-point shift as
described in this section. This offset occurs because a bias current for detect-
ing a Controller sensor error flows to the output impedance of the infrared
temperature sensor.
1. Set a temperature range matching the input specifications of the infrared
temperature sensor. (The ES1B can be used with the E5@N only for a ther-
mocouple/resistance thermometer universal input.)
2. Prepare a thermometer capable of measuring the temperature of the con-
trol target as shown in Figure 1 so that a 1-point shift or 2-point shift can
be carried out.
3. The E53-CN@@P@N2 (for E5CN), E5AN-@@P@-N, or E5EN-@@P@-N
has a built-in external power supply for ES1B Infrared Temperature Sen-
sors. These E5CN models can be used as the power supply when using
ES1B. When ES1B are used with other E5CN models, provide a separate
power supply for the Infrared Temperature Sensors.
Upper-limit temperature
input shift value
Before shifting
Input
100
Section 4-1