Omron CRT1 - 10-2009, Operation Manual

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Temperature Input Units
Section 7-1
7-1 Temperature Input Units
7-1-1 Temperature Input Units
A Temperature Input Unit supports a variety of functions, such as scaling and
peak/bottom hold functions. They can internally perform math operations on
temperature input values, which previously required ladder programming at a
host PLC.
Temperature data can be obtained from math operations and allocated as I/O
in combination with Temperature Status Flags or other status information. The
CX-Integrator can be used to easily allocate and monitor status information,
set Temperature Input Unit functions, and monitor data.
7-1-2 List of Data Processing Functions
The following tables list the data processing functions that can be used with
Temperature Input Units. Refer to
11-6 Temperature Input Unit Functions for
details on functions and setting methods.
Function Details Default
Moving average Calculates the average of the past eight temperature
input values, and produces a stable input value even
when the input value is unsteady. Moving average disabled.
Scaling Performs scaling.
Scaling allows conversion of temperature input values
into values using the industry unit required by the user. It
reduces the number of operations requiring ladder pro-
gramming in the master PLC Unit. Scaling also supports
an offset function for compensating for mounting errors in
sensors and other devices.
Disabled
0 to 28,000
Peak/bottom hold Holds the maximum and minimum temperature input val-
ues. Disabled
Top/valley hold Holds the top and valley temperature input values. Disabled
Rate of change Calculates the rate of change for temperature input val-
ues for each sampling period. Disabled
Comparator Temperature input value or data after calculation (peak
value, bottom value, top value, valley value, rate of
change) are compared to 4 types of set values: Alarm Trip
Point High (HH), Warning Trip Point High (H), Warning
Trip Point Low (L), and Alarm Trip Point Low (LL) and the
results are provided using the Temperature Data Status
Flag. Disabled
Input Error Detection Disable
Function Can be used to disable detection of input errors (including
disconnection). This function is used when there are
unused inputs. Disabled
Off-wire detection Detects disconnections of analog inputs. Enabled
User adjustment Can be used to adjust the input value when an offset
occurs due to hardware errors. Disabled
Last maintenance date Records the date of the last maintenance in the Unit. 2008/10/1
Input temperature variation
detection function Makes a relative comparison of two inputs and detects a
temperature difference between two inputs. Disabled
Replace-
ment moni-
toring
functions Temperature
integration func-
tion Compiles the total heat exposure of a device or sensor by
multiplying the temperature and measurement time. Disabled
Top/Valley count
function Counts the number of heating cycles handled by a device
or application that has fixed cycles of temperature
changes. Disabled
Temperature
Range Count Measures how long the system is at a user-set tempera-
ture or within a user-set temperature range. Disabled