1. OVERVIEW MELSEC-A
1-1
1. OVERVIEW
This user's manual explains the specifications, handling, programming methods, etc. of the AJ65BT-
68TD Thermocouple Input Module (hereinafter referred to as AJ65BT-68TD) used as a remote device
station for the CC-Link system.
The AJ65BT-68TD is a module that converts the thermocouple input values from outside the
programmable controller to the temperature values or scaling values of 16-bit signed BIN data.
1.1 Features
The following are the features of the AJ65BT-68TD.
(1) Temperature – digital conversion is possible at eight channels in one module
One AJ65BT-68TD module may perform up to eight channels of temperature – digital
conversions.
(2) Thermocouples conforming the JIS standard may be used.
Seven types of thermocouples (K, E, J, T, B, R and S) that conform to the JIS standard may be
used.
Also, a thermocouple may be chosen independently for each channel
(3) Conversion enabling and disabling
Conversion may be enabled or disabled for each individual channel. By disabling the conversion
of channels that are not used, generation of unnecessary wire breakage detection flags may be
prevented and sampling time may be reduced.
(4) Wire breakage detection is possible
The thermocouple and compensating conductor breakage may be detected for each channel.
(5) Sampling processing and travel average processing may be designated
As a conversion processing method, sampling processing and travel average processing may
designated for each channel.
(6) Cold junction compensation is possible using Pt100 temperature-measuring resistor
Since a Pt100 temperature-measuring resistor is connected, cold junction compensation is
performed automatically.
(7) Pt100 cold junction compensation enable/disable setting is possible
By disabling the cold junction compensation by the Pt100 temperature-measuring resistor, cold
junction compensation may be performed at outside the module.
If the cold junction compensation accuracy ±1 °C of the Pt100 temperature-measuring resistor
may not be ignored as a tolerance, cold junction compensation accuracy may be increased by
installing a high-accuracy ice bus to outside of the module.
(8) Error compensation can be performed by setting the offset/gain value
Error compensation may be performed individually at each channel by setting the offset/gain
value.
Also, the offset/gain value may be selected to use a user setting value or factory setting value.
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