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3
SPECIFICATIONS
3.2 Function List
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1
OVERVIEW
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SYSTEM
CONFIGURATION
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SPECIFICATIONS
4
SETUP AND
PROCEDURES BEFORE
OPERATION
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UTILITY PACKAGE (GX
CONFIGURATOR-TI)
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ONLINE MODULE
CHANGE
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TROUBLESHOOTING
3.2 Function List
The following table lists the Q68TD-G-H02 (H01) functions.
Table 3.3 Function list
Item Description Refer To
Temperature conversion
function
This function allows temperature data to be imported by connecting a thermocouple.
Temperature data are 16-bit signed binary (-2700 to 18200) and stored into buffer memory.
Section 3.4.5
Temperature conversion
system
(1) Sampling processing
Section 3.2.1
A temperature input value is converted one by one on each channel and a measured
temperature value is output after every conversion. Then the value is stored into buffer
memory.
(2) Averaging processing
This processing averages a measured temperature value for each channel and the
averaged value is stored into buffer memory.
Averaging processing contains three methods as described below.
(a) Time average
(b) Count average
(c) Moving average
(3) Primary delay filter
Measured temperature values are smoothed by a preset time constant.
Conversion enable/disable
function
This function specifies whether temperature conversion is enabled or disabled on each
channel.
Section 3.4.2
Thermocouple type
selection function
This function sets the type of thermocouple on each channel. Section 4.5
Disconnection detection
function
(Q68TD-G-H02 only)
This function checks the disconnection of the connected thermocouple on each conversion-
enabled channel.
Section 3.4.15
Conversion setting for
disconnection detection
function
(Q68TD-G-H02 only)
This function is to select a value to be stored in the CH Measured temperature value
(Un\G11 to Un\G18) from "Up scale", "Down scale" or "Given scale" when disconnection is
detected.
Section 3.2.2
Disconnection monitor
function
(Q68TD-G-H01 only)
This function checks the disconnection of the connected thermocouple on each conversion-
enabled channel.
Section 3.4.16
Disconnection state
conversion setting function
(Q68TD-G-H01 only)
This function is to select a value to be stored in the CH Measured temperature value
(Un\G11 to Un\G18) from "Up scale", "Down scale" or "Given scale" when disconnection is
detected.
Section 3.2.3
Cold junction temperature
compensation with/without
setting function
This function determines whether to use cold junction temperature compensation.
Use this function to measure temperature in higher accuracy than the cold junction
temperature compensation accuracy ( 1 ) by the cold junction temperature
compensation resistor (RTD) that is included with the Q68TD-G-H02 (H01).
The cold junction temperature compensation accuracy can be improved by disabling the
cold junction temperature compensation and providing a precision ice bath externally.
Section 4.7
Cold junction temperature
compensation resistor
disconnection detection
function
This function detects a disconnection of connected cold junction temperature compensation
resistor (RTD).
Section 3.2.5
Warning output function
(1)
(2)
Process alarm
A warning is output when the measured temperature value is equal to or more than the
process alarm upper upper limit value, or equal to or less than the process alarm lower
lower limit value.
Rate alarm
A warning is output when the measured temperature value changes in a rate by which
the measured temperature value reaches the rate alarm upper limit value or more, or
the rate alarm lower limit value or less.
Section 3.2.4