3.2 Function List; Temperature Conversion System - Mitsubishi MELSEC-Q Series User Manual

3
SPECIFICATIONS
3.2 Function List
The following table lists the Q68TD-G-H01 functions.
Item
Temperature conversion
function
Temperature conversion
system
Conversion enable/disable
function
Thermocouple type
selection function
Disconnection monitor
function
Disconnection state
conversion setting function
Cold junction temperature
compensation with/without
setting function
Cold junction temperature
compensation resistor
disconnection detection
function
Warning output function
Scaling function
Offset/gain setting function
Online module change
3
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3.2 Function List

Table 3.3 Function list
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.
(1) Sampling processing
A temperature input value is converted one by one on each channel and a measured
temperature value is output after every conversion.
(2) Averaging processing
(a) Time average
Temperature conversion is averaged by time on each channel and an averaged
value is stored.
(b) Count average
Temperature conversion is averaged by count on each channel and an averaged
value is stored.
(c) Moving average
Measured temperature values, which are taken at every sampling interval for the
specified number of times, are averaged.
(3) Primary delay filter
Measured temperature values are smoothed by a preset time constant.
This function specifies whether temperature conversion is enabled or disabled on each
channel.
Conversion time is 320ms/8channels.
This function sets the type of thermocouple on each channel.
This function checks the disconnection of the connected thermocouple on each conversion-
enabled channel.
For values to be stored in the CH
the case of disconnection, any of "Up scale (the maximum value of measured temperature
range + 5% of measured temperature range)", "Down scale (the minimum value of
measured temperature range - 5% of measured temperature range)", or "Given value" can
be selected.
This function determines whether to use cold junction temperature compensation.
Use this function to measure temperatures at high accuracy when the cold junction
temperature compensation accuracy ( 1
The cold junction temperature compensation accuracy can be improved by disabling the
cold junction temperature compensation and providing a precision ice bath externally.
This function detects a disconnection of connected cold junction temperature compensation
resistor.
(1) Process alarm
When measured temperature value exceeds the preset range, a warning is output.
(2) Rate alarm
When the change of measured temperature value exceeds the preset change, a
warning is output.
This function can convert a measured temperature value into a preset range ratio (%) and
import it into buffer memory.
This function compensates an error of measured temperature value.
A module change is made without the system being stopped.
Description
measured temperature value (UN\G11 to Un\G18) in
) cannot be taken as a margin of error.
Refer To
Section 3.4.5
Section 3.2.1
Section 3.4.2
Section 4.5
Section 3.4.14
Section 3.2.2
Section 4.7
Section 3.2.4
Section 3.2.3
Section 3.4.15
to
Section 3.4.18
Section 3.4.11
Section 4.6
CHAPTER 7