JP2002357484A - Programmable controller, resistance thermometer element input module for it, and method and program for forming temperature measurement signal - Google Patents
Programmable controller, resistance thermometer element input module for it, and method and program for forming temperature measurement signalInfo
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- JP2002357484A JP2002357484A JP2001168211A JP2001168211A JP2002357484A JP 2002357484 A JP2002357484 A JP 2002357484A JP 2001168211 A JP2001168211 A JP 2001168211A JP 2001168211 A JP2001168211 A JP 2001168211A JP 2002357484 A JP2002357484 A JP 2002357484A
- Authority
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- Japan
- Prior art keywords
- resistance
- temperature
- programmable controller
- voltage drop
- temperature measurement
- Prior art date
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- Programmable Controllers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、プログラマブルコ
ントローラに係り、特に、接続される測温抵抗素子の抵
抗に基づき測温対象物の温度に対応した測温信号を形成
する技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a programmable controller, and more particularly to a technique for forming a temperature measurement signal corresponding to the temperature of an object to be measured based on the resistance of a connected resistance temperature sensor.
【０００２】[0002]
【従来の技術】測温抵抗素子についてはＪＩＳのＣ１６
０４−１９８９に規定があり（「測温抵抗体」）、測温
抵抗素子は導線形式や規定電流や使用温度範囲などによ
って複数種類に分けられる。抵抗値は一般に０゜Ｃのと
きの抵抗値が基準とされ、例えば、測温抵抗素子Ｐｔ１
００は、白金から成り、０゜Ｃのときの抵抗値が１００
Ω、Ｐｔ１０００は、白金から成り、０゜Ｃのときの抵
抗値が１０００Ω、Ｐｔ５０は、材質が白金で０゜Ｃの
ときの抵抗値が５０Ω、Ｎｉ５０００は、材質がニッケ
ルで、０゜Ｃのときの抵抗値が５０００Ωである。いず
れも、周囲温度の上昇につれ抵抗値も増加する。従来の
プログラマブルコントローラでは、図５に示すように、
測温抵抗体入力モジュール（ユニット）の入力チャンネ
ルが、これら複数種類の測温抵抗素子のうち予め設定さ
れた（または接続された）いずれか１つの種類の測温抵
抗素子２に対し固定的に対応する構成となっている。図
５において、１'は定電流回路、３、３'は、測温抵抗素
子２の電圧降下を検出する検出端子である。2. Description of the Related Art Regarding resistance temperature detectors, JIS C16
04-1989 ("resistance temperature detector"), and the resistance temperature elements are classified into a plurality of types according to the conductor type, the specified current, the operating temperature range, and the like. The resistance value is generally based on the resistance value at 0 ° C.
00 is made of platinum and has a resistance of 100 at 0 ° C.
Ω and Pt1000 are made of platinum and have a resistance of 1000Ω at 0 ° C., Pt50 has a material of platinum at 50 ° C. at 0 ° C., and Ni5000 has a material of nickel and 0 ° C. The resistance value at this time is 5000Ω. In any case, the resistance value increases as the ambient temperature increases. In a conventional programmable controller, as shown in FIG.
The input channel of the resistance thermometer input module (unit) is fixedly connected to any one of the predetermined types (or connected) of the plurality of types of resistance temperature elements. It has a corresponding configuration. In FIG. 5, reference numeral 1 'denotes a constant current circuit, and reference numerals 3 and 3' denote detection terminals for detecting a voltage drop of the resistance temperature sensor 2.
【０００３】[0003]
【発明が解決しようとする課題】上記従来技術では、プ
ログラマブルコントローラに接続されている測温抵抗素
子を、入力チャンネルにおいて異なる種類のものに切替
えようとする場合、測温抵抗体入力モジュール（ユニッ
ト）を、該新たに接続される測温抵抗素子に対応したも
のに交換するかまたは切替えスイッチ等により切替える
必要がある。例えば、図５において、測温抵抗素子２が
Ｐｔ１００の場合、温度０゜Ｃのときの該測温抵抗素子
の抵抗値は１００Ωである。該条件下で、２ｍＡの定電
流を該測温抵抗素子に流すと、測温抵抗素子の両端の電
圧降下は２００ｍＶとなる。温度が上昇すると抵抗値も
増えて電圧降下も増える。アナログ信号として検出され
る電圧降下をデジタル信号としての電圧降下に変換し、
該電圧降下と定電流値から抵抗値を求め、Ｐｔ１００用
の温度値−抵抗値のデータテーブル内の抵抗値と比較す
ることにより温度を読み取る。しかし、測温抵抗素子を
Ｐｔ１００からＰｔ１０００に変更した場合は、上記Ｐ
ｔ１００の場合と同様の定電流２ｍＡを温度０゜Ｃ下で
測温抵抗素子に流すと、測温抵抗素子の両端には２００
０ｍＶの電圧降下が発生し、温度が上昇すると抵抗値も
増えるため電圧降下もさらに増える。このように、同じ
温度、同じ電流値の条件下でも同じ電圧降下は発生しな
い。このため、プログラマブルコントローラの測温抵抗
体入力モジュールがＰｔ１００用に設計されている場合
には、Ｐｔ１０００の測温抵抗素子では間違った温度デ
ータを取り込むこととなるし、測温抵抗体入力モジュー
ルに使用している電子部品の絶対定格を超えた電圧を取
り込んだ場合には、該モジュールの故障を誘発すること
もある。本発明の課題点は、上記従来技術に鑑み、測温
抵抗素子が異なる種類のものに交換されたり、切替えら
れたりした場合も、測温抵抗体入力モジュール側で該異
なる種類の測温抵抗素子に対応して正しい測温信号を形
成できるようにすることである。本発明の目的は、かか
る課題点を解決できる技術の提供にある。According to the above prior art, when it is desired to switch a resistance temperature sensor connected to a programmable controller to a different type in an input channel, a resistance temperature detector input module (unit) is used. Must be replaced with a device corresponding to the newly connected resistance temperature measuring element or switched by a changeover switch or the like. For example, in FIG. 5, when the resistance temperature element 2 is Pt100, the resistance value of the resistance temperature element at a temperature of 0 ° C. is 100Ω. When a constant current of 2 mA flows through the resistance temperature element under the above conditions, the voltage drop across the resistance temperature element is 200 mV. As the temperature increases, the resistance value increases and the voltage drop increases. Convert the voltage drop detected as an analog signal into a voltage drop as a digital signal,
A resistance value is obtained from the voltage drop and the constant current value, and the temperature is read by comparing the resistance value in a temperature-resistance value data table for Pt100. However, when the temperature measuring resistance element is changed from Pt100 to Pt1000, the above P
When a constant current of 2 mA similar to the case of t100 is applied to the resistance temperature element at a temperature of 0 ° C., 200 mm is applied to both ends of the resistance temperature element.
A voltage drop of 0 mV occurs, and when the temperature rises, the resistance value also increases, so that the voltage drop further increases. As described above, the same voltage drop does not occur even under the condition of the same temperature and the same current value. For this reason, if the RTD input module of the programmable controller is designed for Pt100, the Pt1000 RTD will capture incorrect temperature data, and will not be used for the RTD input module. If a voltage exceeding the absolute rating of the electronic component is taken in, the module may fail. In view of the above prior art, the problem of the present invention is that even when the temperature measuring resistor element is replaced or switched to a different type, the temperature measuring resistor input module side also uses the different type temperature measuring resistor element. In order to form a correct temperature measurement signal. An object of the present invention is to provide a technique capable of solving such a problem.
【０００４】[0004]
【課題を解決するための手段】上記課題点を解決するた
めに本発明では、プログラマブルコントローラの測温抵
抗体入力モジュール側で自動的に測温抵抗素子の種類を
識別して正しい温度値を取込めるようにする。具体的に
は、 （１）接続される測温抵抗素子の抵抗に基づき測温対象
物の温度に対応した信号を出力可能なプログラマブルコ
ントローラとして、定電流を流したときの上記測温抵抗
素子の電圧降下レベルを検知する検知手段と、該電圧降
下レベルに基づき該測温抵抗素子を識別する識別手段
と、該識別結果に基づき信号増幅率を制御する制御手段
と、を備え、異なる特性の測温抵抗素子に対応可能な構
成を備える。 （２）上記（１）において、上記識別手段を、異なる値
の定電流を流したときの上記測温抵抗素子の電圧降下レ
ベルの差分に基づき該測温抵抗素子を識別する構成とす
る。 （３）上記（１）において、上記識別手段を、複数の入
力チャンネルに設ける。 （４）接続される測温抵抗素子の抵抗に基づき測温対象
物の温度に対応した測温信号を形成するプログラマブル
コントローラの測温信号形成方法として、定電流を流し
上記測温抵抗素子の電圧降下レベルを検知するステップ
と、該電圧降下レベルに基づき該測温抵抗素子を識別す
るステップと、該識別結果に基づき信号増幅率を制御す
るステップと、を経て、測温信号を形成し、異なる特性
の測温抵抗素子に対応可能にする。 （５）接続される測温抵抗素子の抵抗に基づき測温対象
物の温度に対応した測温信号を形成するプログラマブル
コントローラの測温信号形成用のプログラムとして、コ
ンピュータに、定電流を流し上記測温抵抗素子の電圧降
下レベルを検知する手順と、該電圧降下レベルに基づき
該測温抵抗素子を識別する手順と、該識別結果に基づき
信号増幅率を制御する手順と、を実行させて、上記プロ
グラマブルコントローラを異なる特性の測温抵抗素子に
対応可能なようにする。 （６）接続される測温抵抗素子の抵抗に基づき測温対象
物の温度に対応した信号を形成可能なプログラマブルコ
ントローラの測温モジュールとして、定電流を流したと
きの上記測温抵抗素子の電圧降下レベルにより該測温抵
抗素子を識別する識別回路を備え、異なる特性の測温抵
抗素子に対応可能な構成とする。According to the present invention, in order to solve the above-mentioned problems, the temperature sensor input module of the programmable controller automatically identifies the type of the temperature sensor and obtains a correct temperature value. So that you can put it in. Specifically, (1) a programmable controller capable of outputting a signal corresponding to the temperature of the temperature measuring object based on the resistance of the connected temperature measuring resistance element, Detecting means for detecting the voltage drop level; identifying means for identifying the resistance temperature element based on the voltage drop level; and control means for controlling a signal amplification factor based on the identification result. A structure capable of supporting a temperature resistance element is provided. (2) In the above (1), the identification means is configured to identify the resistance temperature element based on a difference in voltage drop level of the resistance element when a constant current of a different value is applied. (3) In the above (1), the identification means is provided for a plurality of input channels. (4) As a method of forming a temperature measurement signal of a programmable controller that forms a temperature measurement signal corresponding to the temperature of a temperature measurement target based on the resistance of a connected temperature measurement resistance element, a constant current is applied to the voltage of the temperature measurement resistance element. Forming a temperature measurement signal through a step of detecting a drop level, a step of identifying the resistance temperature element based on the voltage drop level, and a step of controlling a signal amplification factor based on the identification result; It is possible to correspond to a temperature measuring resistance element with characteristics. (5) As a program for forming a temperature measurement signal of a programmable controller that forms a temperature measurement signal corresponding to the temperature of the temperature measurement target based on the resistance of the connected temperature measurement resistance element, a constant current is passed to a computer to perform the measurement. Detecting the voltage drop level of the temperature resistance element, identifying the temperature measurement resistance element based on the voltage drop level, and controlling the signal amplification factor based on the identification result. A programmable controller is made to be compatible with resistance measuring elements having different characteristics. (6) As a temperature measuring module of a programmable controller capable of forming a signal corresponding to the temperature of the temperature measuring object based on the resistance of the connected temperature measuring resistor, the voltage of the temperature measuring resistor when a constant current is applied. An identification circuit for identifying the resistance temperature element based on the drop level is provided, so that the resistance element having different characteristics can be used.
【０００５】[0005]
【発明の実施の形態】以下、本発明の実施例につき図面
を用いて説明する。図１は本発明の第１の実施例を示
す。図１において、１は２パターンの定電流回路、２は
測温抵抗素子、３、３'は測温抵抗素子３の両端の電圧
降下を検出する検出端子、４は、検出端子２の出力をア
ナログ値として取り込むＡ／Ｄ変換器、５は測温抵抗素
子の抵抗値を温度値に変換するＣＰＵ、６はコントロー
ル信号線である。測温抵抗素子２をＰｔ１００とし、周
囲温度０゜Ｃの時の抵抗を１００Ωと仮定し、図１の構
成における動作を、図２を参照しながら説明すると以下
のようになる。すなわち、（１）測温抵抗素子２の接続
状態等のチェックを行う。（２）定電流回路１からテス
ト電流Ａとして、例えば２ｍＡの定電流を流し、検出端
子２に発生する測温抵抗素子２の電圧降下を測定する。
この場合、検出端子３、３'間に発生する測温抵抗素子
２の電圧降下は２００ｍＶである。（３）該電圧降下を
Ａ／Ｄ変換器４に入力しデジタル値Ａを求める。（４）
該デジタル値ＡをＣＰＵ５に記憶させる。（５）次に、
ＣＰＵ５からコントロール信号を、コントロール信号線
６により定電流回路１に出力し、定電流回路１の定電流
を、テスト電流Ｂとしての例えば２．５ｍＡに変更す
る。この場合、該変更により、検出端子３、３'には２
５０ｍＶの電圧降下が発生する。（６）検出端子３、
３'の電圧降下をＡ／Ｄ変換器４に入力しデジタル値Ｂ
を求める。（７）求めたデジタル値ＢをＣＰＵ５に記憶
させる。（８）デジタル値Ａとデジタル値Ｂの差から測
温抵抗素子２の温度値−抵抗値の傾きを求める。（９）
該測定結果としての温度値−抵抗値の傾きをＣＰＵ５に
より、予めＣＰＵ５に記憶させておいた各種の測温抵抗
素子の温度値−抵抗値の傾きのデータテーブルと照合
し、該照合結果から、測温抵抗素子２の種類を識別す
る。上記（１）〜（９）または（２）〜（９）の手順
は、プログラムに従いＣＰＵに実行させる。上記第１の
実施例によれば、測温抵抗素子が異なる種類のものに切
替えられた場合も、測温抵抗体入力モジュールでは、該
切替えられた測温抵抗素子を自動的に識別できる。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a constant current circuit having two patterns, reference numeral 2 denotes a resistance thermometer, and reference numerals 3 and 3 'denote detection terminals for detecting a voltage drop across the resistance resistance element 3, and reference numeral 4 denotes an output of the detection terminal 2. An A / D converter for taking in an analog value, a CPU 5 for converting the resistance value of the resistance temperature element to a temperature value, and a control signal line 6. The operation in the configuration of FIG. 1 will be described below with reference to FIG. 2, assuming that the temperature measuring resistance element 2 is Pt100 and the resistance at an ambient temperature of 0 ° C. is 100Ω. That is, (1) the connection state of the temperature measuring resistance element 2 is checked. (2) A constant current of, for example, 2 mA is passed from the constant current circuit 1 as the test current A, and the voltage drop of the resistance temperature element 2 generated at the detection terminal 2 is measured.
In this case, the voltage drop of the resistance temperature sensor 2 generated between the detection terminals 3 and 3 'is 200 mV. (3) The voltage drop is input to the A / D converter 4 to obtain a digital value A. (4)
The digital value A is stored in the CPU 5. (5) Next,
A control signal is output from the CPU 5 to the constant current circuit 1 through the control signal line 6, and the constant current of the constant current circuit 1 is changed to, for example, 2.5 mA as the test current B. In this case, the change causes the detection terminals 3, 3 'to
A voltage drop of 50 mV occurs. (6) Detection terminal 3,
The voltage drop of 3 'is input to the A / D converter 4 and the digital value B
Ask for. (7) The obtained digital value B is stored in the CPU 5. (8) From the difference between the digital value A and the digital value B, the slope of “temperature value−resistance value” of the RTD 2 is obtained. (9)
The temperature value-resistance slope as the measurement result is collated by the CPU 5 with the data table of temperature value-resistance slope of various temperature measuring resistance elements stored in the CPU 5 in advance, and from the collation result, The type of the temperature measuring resistance element 2 is identified. The above steps (1) to (9) or (2) to (9) are executed by the CPU according to a program. According to the first embodiment, even when the resistance thermometer is switched to a different type, the resistance thermometer input module can automatically identify the switched resistance thermometer.
【０００６】図３は本発明の第２の実施例を示す。本第
２の実施例は、上記図１、図２示す方法で識別した測温
抵抗素子に対応するようにオペアンプ等の増幅器の増幅
率を自動変更する構成を備える場合の例である。例え
ば、測温抵抗体入力モジュールの測温信号形成部が測温
抵抗素子Ｐｔ１００の電圧範囲を基準に設定されている
としたとき、測温抵抗素子を、例えばＰｔ１０００に切
替えた場合は１０倍の電圧が測温抵抗体入力モジュール
の測温信号形成部に入力されるため、該入力部の許容電
圧範囲（ダイナミックレンジ）を大きく超え、測温信号
の形成が不可能になる。本第２の実施例は、かかる場合
にも対応できるようにしたものであり、異なる種類の測
温抵抗素子に切替えられた場合は、該切替えられた測温
抵抗素子を上記第１の実施例の場合と同様にして識別
し、該識別した測温抵抗素子に対応した電圧処理を行っ
て、測温抵抗体入力モジュールの測温信号形成部に入力
される電圧を、該測温信号形成部の許容電圧範囲（ダイ
ナミックレンジ）内の値にし、測温信号の形成を可能に
する。FIG. 3 shows a second embodiment of the present invention. The second embodiment is an example in which a configuration is provided in which the amplification factor of an amplifier such as an operational amplifier is automatically changed so as to correspond to the resistance temperature element identified by the method shown in FIGS. For example, when it is assumed that the temperature measurement signal forming unit of the temperature measurement resistor input module is set based on the voltage range of the temperature measurement resistance element Pt100, when the temperature measurement resistance element is switched to, for example, Pt1000, ten times as large. Since the voltage is input to the temperature measuring signal forming section of the temperature measuring resistor input module, the voltage greatly exceeds the allowable voltage range (dynamic range) of the input section, and it is impossible to form a temperature measuring signal. The second embodiment is adapted to cope with such a case. When the temperature sensor is switched to a different type of resistance thermometer, the switched temperature sensor is replaced by the first embodiment. And performs voltage processing corresponding to the identified resistance temperature sensor element, and converts the voltage input to the temperature measurement signal forming unit of the temperature sensor input module into the temperature measurement signal forming unit. To a value within the allowable voltage range (dynamic range), thereby enabling the formation of a temperature measurement signal.
【０００７】図３において、１は２パターンの定電流を
出力可能な定電流回路、２は測温抵抗素子、８はアナロ
グ入力内蔵のマイコン、９はデコードＩＣ、１０は測温
抵抗素子２により発生したアナログ電圧信号を増幅する
アナログ入力増幅器、１１は該アナログ入力増幅器１０
の増幅率を切替える増幅率切替え器、１２は定電流伝送
ラインである。かかる構成において、測温抵抗素子２が
異なる種類のものに切替えられたとき、マイコン８の制
御により、定電流回路１からの２種類の電流を測温抵抗
素子２に流し、これによるそれぞれの電圧降下をアナロ
グ入力増幅器１０で読込み、マイコン８内でＡ／Ｄ変換
しデジタル信号として記憶する。これに基づき、上記第
１の実施例の場合と同様にして、該マイコン８で該切替
えられた測温抵抗素子２を識別する。増幅率切替え器１
１は、該識別結果に基づく該マイコン８からの増幅率切
替え信号をデコード化した切替え制御信号により制御さ
れ、アナログ入力増幅器１０の増幅率を、該測温抵抗素
子２に対応した増幅率となるように切替える。該切替え
制御信号は切替えバス信号線７により伝送される。該ア
ナログ入力増幅器１０の増幅率は、切替えられた測温抵
抗素子の抵抗が高く電圧降下が大きい場合は低増幅率と
され、反対に、切替えられた測温抵抗素子の抵抗が低く
電圧降下が小さい場合は高増幅率とされて、測温抵抗体
入力モジュールの測温信号形成部に入力される電圧が、
該測温信号形成部の許容電圧範囲（ダイナミックレン
ジ）内となるようにされる。例えば、測温抵抗素子Ｐｔ
１００からＰｔ１０００に切替えられた場合は、増幅率
は１／１０とされ、反対に、Ｐｔ１０００からＰｔ１０
０に切替えられた場合は、増幅率は１０倍とされる。こ
のようにして測温抵抗素子２が切替わっても、マイコン
制御により自動的にアナログ入力増幅器１０の増幅率を
変更することで、アナログポートに入力される電圧は、
該アナログポートの許容範囲の電圧に変えられる。本第
２の実施例では、上記のように、上記測温抵抗素子２の
抵抗に基づく電圧降下を検知（検出）する手順と、該電
圧降下信号に基づき自動的に該測温抵抗素子２を識別す
る手順と、該識別結果に基づき上記アナログ入力増幅器
１０の信号増幅率を制御する手順は全て、プログラムに
従い上記マイコン８に実行させる。上記第２の実施例に
よれば、測温抵抗素子が異なる種類のものに交換された
り、切替えられたりした場合も、測温抵抗体入力モジュ
ールでは自動的に、該切替えられた測温抵抗素子を識別
でき、測温信号形成部に入力される電圧を許容電圧範囲
（ダイナミックレンジ）内にできるため、プログラマブ
ルコントローラの測温信号形成が可能となる。In FIG. 3, 1 is a constant current circuit capable of outputting two patterns of constant currents, 2 is a resistance temperature sensor, 8 is a microcomputer having a built-in analog input, 9 is a decode IC, and 10 is a resistance thermometer 2. An analog input amplifier for amplifying the generated analog voltage signal;
Is a constant-current transmission line. In this configuration, when the temperature measuring resistance element 2 is switched to a different type, two kinds of currents from the constant current circuit 1 are caused to flow through the temperature measuring resistance element 2 under the control of the microcomputer 8, and the respective voltages are set accordingly. The drop is read by the analog input amplifier 10, A / D converted in the microcomputer 8, and stored as a digital signal. Based on this, the microcomputer 8 identifies the switched resistance temperature element 2 in the same manner as in the first embodiment. Gain switch 1
1 is controlled by a switching control signal obtained by decoding an amplification factor switching signal from the microcomputer 8 based on the identification result, so that the amplification factor of the analog input amplifier 10 becomes an amplification factor corresponding to the resistance thermometer element 2. Switch as follows. The switching control signal is transmitted by the switching bus signal line 7. The amplification factor of the analog input amplifier 10 is set to a low amplification factor when the resistance of the switched resistance temperature sensor is high and the voltage drop is large, and conversely, the resistance of the switched resistance temperature sensor is low and the voltage drop is low. If it is small, it is considered as a high amplification factor, and the voltage input to the temperature measurement signal forming unit of the resistance temperature detector input module is
The temperature is set within the allowable voltage range (dynamic range) of the temperature measurement signal forming unit. For example, a resistance temperature measuring element Pt
When switching from 100 to Pt1000, the amplification factor is reduced to 1/10, and conversely, from Pt1000 to Pt10
When switched to zero, the amplification factor is set to 10 times. Even if the temperature-measuring resistance element 2 is switched in this way, the voltage input to the analog port can be changed by automatically changing the gain of the analog input amplifier 10 under the control of the microcomputer.
The voltage can be changed to an allowable range of the analog port. In the second embodiment, as described above, a procedure for detecting (detecting) a voltage drop based on the resistance of the temperature measuring resistor element 2 and automatically detecting the temperature measuring resistor element 2 based on the voltage drop signal. The microcomputer 8 causes the microcomputer 8 to execute all of the identification procedure and the procedure of controlling the signal amplification factor of the analog input amplifier 10 based on the identification result. According to the second embodiment, even when the resistance temperature sensor element is replaced with a different type or switched, the resistance temperature sensor input module automatically switches the switched resistance temperature element. Can be identified and the voltage input to the temperature measurement signal forming unit can be within the allowable voltage range (dynamic range), so that the temperature measurement signal can be formed by the programmable controller.
【０００８】図４は本発明の第３の実施例を示す。本第
３の実施例は、測温抵抗体入力モジュールの複数の入力
チャンネルにおいて個別に測温抵抗素子の切替えに対し
対応可能なようにした場合の構成例である。図４では３
つの入力チャンネルの場合を示す。図４において、１は
定電流回路、２ａ、２ｂ、２ｃはそれぞれのチャンネル
に対応した測温抵抗素子、７は切替えバス信号線、８は
アナログ入力内蔵のマイコン、９はデコードＩＣ、２
０、２１、２２はそれぞれのチャンネルに対応したアナ
ログ入力回路部、１５、２３は動作させる入力チャンネ
ルを選択するマルチプレクサである。各アナログ入力回
路部２０、２１、２２は、上記図３に示したと同様のア
ナログ入力増幅器及び増幅率切替え器を備えて構成され
ている。かかる構成において、上記測温抵抗素子２ａ、
２ｂ、２ｃそれぞれにつき、上記図２及び図３で説明し
たと同様の方法で、識別及びその結果に基づくアナログ
入力増幅器の増幅率の切替えを行う。測温抵抗素子２ａ
についての識別及び増幅率の切替えを行う場合には、マ
ルチプレクサ１５を測温抵抗素子２ａに定電流が流れる
ように選択し、かつ、マルチプレクサ２３を、アナログ
入力回路部２０に取り込んだアナログ値が該アナログ入
力回路部２０からマイコン８のアナログポートに取り込
めるように選択する。同様に、測温抵抗素子２ｂ、２ｃ
ついての識別及び増幅率の切替えを行う場合には、マル
チプレクサ１５を測温抵抗素子２ｂ、２ｃに定電流が流
れるように選択し、かつ、マルチプレクサ２３を、アナ
ログ入力回路部２０に取り込んだアナログ値が該アナロ
グ入力回路部２０からマイコン８のアナログポートに取
り込めるように選択する。テスト電流としての定電流の
選択は切替えバス信号線７にて行う。本第３の実施例で
も、上記のように、上記測温抵抗素子２ａ、２ｂ、２ｃ
の抵抗に基づく電圧降下を検知（検出）する手順と、該
電圧降下信号に基づき自動的に該測温抵抗素子２ａ、２
ｂ、２ｃを識別する手順と、該識別結果に基づき上記ア
ナログ入力回路部２０内のアナログ入力増幅器の信号増
幅率等を制御する手順は全て、プログラムに従い上記マ
イコン８に実行させるようになっている。上記第３の実
施例によれば、各入力チャンネルにおいて測温抵抗素子
が異なる種類のものに交換されたり、切替えられたりし
た場合も、測温抵抗体入力モジュールでは自動的に、該
切替えられた測温抵抗素子を識別でき、測温抵抗体入力
モジュールの測温信号形成部に入力される電圧を、許容
電圧範囲（ダイナミックレンジ）内にできるため、プロ
グラマブルコントローラの測温信号形成が可能となる。FIG. 4 shows a third embodiment of the present invention. The third embodiment is an example of a configuration in which a plurality of input channels of a resistance temperature detector input module can individually respond to switching of resistance temperature elements. In FIG. 4, 3
This shows the case of one input channel. In FIG. 4, 1 is a constant current circuit, 2a, 2b, and 2c are resistance temperature sensors corresponding to respective channels, 7 is a switching bus signal line, 8 is a microcomputer with a built-in analog input, 9 is a decode IC,
Reference numerals 0, 21 and 22 denote analog input circuit sections corresponding to the respective channels, and reference numerals 15 and 23 denote multiplexers for selecting input channels to be operated. Each of the analog input circuit units 20, 21, and 22 is provided with an analog input amplifier and an amplification factor switch similar to those shown in FIG. In such a configuration, the temperature measuring resistance element 2a,
For each of 2b and 2c, identification and switching of the amplification factor of the analog input amplifier based on the result are performed in the same manner as described with reference to FIGS. Resistance thermometer element 2a
When the identification and switching of the amplification factor are performed, the multiplexer 15 is selected so that a constant current flows through the resistance temperature measuring element 2a, and the multiplexer 23 outputs the analog value taken into the analog input circuit unit 20. It is selected so that it can be taken from the analog input circuit section 20 to the analog port of the microcomputer 8. Similarly, the resistance temperature measuring elements 2b, 2c
When the identification and switching of the amplification factor are performed, the multiplexer 15 is selected so that a constant current flows through the resistance temperature measuring elements 2b and 2c, and the multiplexer 23 is set to the analog value input to the analog input circuit unit 20. From the analog input circuit section 20 to be taken into the analog port of the microcomputer 8. Selection of a constant current as a test current is performed by the switching bus signal line 7. Also in the third embodiment, as described above, the temperature-measuring resistance elements 2a, 2b, 2c
For detecting (detecting) a voltage drop based on the resistance of the temperature-measuring resistance elements 2a, 2a and 2b based on the voltage drop signal.
The procedure for identifying b and 2c and the procedure for controlling the signal amplification factor of the analog input amplifier in the analog input circuit section 20 based on the identification result are all executed by the microcomputer 8 according to a program. . According to the third embodiment, even when the resistance temperature sensor element is replaced with a different type or switched in each input channel, the resistance temperature sensor input module automatically performs the switching. Since the temperature measuring resistance element can be identified and the voltage input to the temperature measuring signal forming section of the temperature measuring resistor input module can be within the allowable voltage range (dynamic range), it is possible to form the temperature measuring signal of the programmable controller. .
【０００９】[0009]
【発明の効果】本発明によれば、プログラマブルコント
ローラ側で自動的に、測温抵抗素子の種類を識別し、該
識別結果に基づき増幅率等の切替えを行って正しい測温
信号を形成できる。According to the present invention, the type of the temperature measuring resistance element can be automatically identified on the programmable controller side, and the amplification factor and the like can be switched based on the identification result to form a correct temperature measurement signal.
【図１】本発明の第１の実施例を示す図である。FIG. 1 is a diagram showing a first embodiment of the present invention.
【図２】本発明の動作フローの説明図である。FIG. 2 is an explanatory diagram of an operation flow of the present invention.
【図３】本発明の第２の実施例を示す図である。FIG. 3 is a diagram showing a second embodiment of the present invention.
【図４】本発明の第３の実施例を示す図である。FIG. 4 is a diagram showing a third embodiment of the present invention.
【図５】従来例の説明図である。FIG. 5 is an explanatory diagram of a conventional example.
１、１'…定電流回路、 ３，３'…検出端子、 ２、２
ａ、２ｂ、２ｃ…測温抵抗素子、 ４…Ａ／Ｄ変換器、
５…ＣＰＵ、 ７…切替えバス信号線、 ８…マイコ
ン、 ９…デコードＩＣ、 １０…アナログ入力増幅
器、 １１…増幅率切替え器、 １５、２３…マルチプ
レクサ、 ２０、２１、２２…アナログ入力回路部。1, 1 ': constant current circuit, 3, 3': detection terminal, 2, 2
a, 2b, 2c: resistance temperature detector, 4: A / D converter,
Reference numeral 5: CPU, 7: switching bus signal line, 8: microcomputer, 9: decode IC, 10: analog input amplifier, 11: amplification rate switch, 15, 23: multiplexer, 20, 21, 22: analog input circuit section.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5H220 BB05 BB11 CC03 CX05 EE09 FF09 JJ07 JJ17 JJ28 KK03 LL04 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H220 BB05 BB11 CC03 CX05 EE09 FF09 JJ07 JJ17 JJ28 KK03 LL04
Claims (6)
温対象物の温度に対応した信号を出力可能なプログラマ
ブルコントローラであって、 定電流を流したときの上記測温抵抗素子の電圧降下レベ
ルを検知する検知手段と、 該電圧降下レベルに基づき該測温抵抗素子を識別する識
別手段と、 該識別結果に基づき信号増幅率を制御する制御手段と、 を備え、異なる特性の測温抵抗素子に対応可能な構成を
備えたことを特徴とするプログラマブルコントローラ。1. A programmable controller capable of outputting a signal corresponding to the temperature of a temperature measuring object based on the resistance of a connected temperature measuring resistance element, wherein the voltage of the temperature measuring resistance element when a constant current is passed. Detecting means for detecting a drop level; identifying means for identifying the resistance temperature element based on the voltage drop level; and control means for controlling a signal amplification factor based on the identification result. A programmable controller characterized by having a configuration capable of supporting a resistance element.
たときの上記測温抵抗素子の電圧降下レベルの差分に基
づき該測温抵抗素子を識別する構成である請求項１に記
載のプログラマブルコントローラ。2. The resistance measuring element according to claim 1, wherein said identification means identifies said resistance temperature element based on a difference in voltage drop level of said resistance element when a constant current of a different value is passed. Programmable controller.
設けられる請求項１に記載のプログラマブルコントロー
ラ。3. The programmable controller according to claim 1, wherein said identification means is provided for a plurality of input channels.
温対象物の温度に対応した測温信号を形成するプログラ
マブルコントローラの測温信号形成方法であって、 定電流を流し上記測温抵抗素子の電圧降下レベルを検知
するステップと、 該電圧降下レベルに基づき該測温抵抗素子を識別するス
テップと、 該識別結果に基づき信号増幅率を制御するステップと、 を経て、測温信号を形成し、異なる特性の測温抵抗素子
に対応可能にするプログラマブルコントローラの測温信
号形成方法。4. A method for forming a temperature measurement signal of a programmable controller for forming a temperature measurement signal corresponding to a temperature of an object to be measured based on a resistance of a connected temperature measurement resistance element. Detecting a voltage drop level of the resistance element, identifying the temperature measurement resistance element based on the voltage drop level, and controlling a signal amplification factor based on the identification result. A method of forming a temperature measurement signal of a programmable controller which is formed and can be adapted to resistance measurement elements having different characteristics.
温対象物の温度に対応した測温信号を形成するプログラ
マブルコントローラの測温信号形成用のプログラムであ
って、 コンピュータに、 定電流を流し上記測温抵抗素子の電圧降下レベルを検知
する手順と、 該電圧降下レベルに基づき該測温抵抗素子を識別する手
順と、 該識別結果に基づき信号増幅率を制御する手順と、 を実行させて、上記プログラマブルコントローラを異な
る特性の測温抵抗素子に対応可能なようにすることを特
徴とするプログラマブルコントローラの測温信号形成用
のプログラム。5. A program for forming a temperature measurement signal of a programmable controller for forming a temperature measurement signal corresponding to the temperature of an object to be measured based on the resistance of a connected temperature measurement resistance element. Executing a procedure of detecting the voltage drop level of the resistance temperature sensor element, identifying the resistance temperature element based on the voltage drop level, and controlling a signal amplification factor based on the identification result. A program for forming a temperature measurement signal of the programmable controller, wherein the programmable controller is adapted to be compatible with temperature measurement resistance elements having different characteristics.
温対象物の温度に対応した信号を形成可能なプログラマ
ブルコントローラの測温モジュールであって、 定電流を流したときの上記測温抵抗素子の電圧降下レベ
ルにより該測温抵抗素子を識別する識別回路を備え、異
なる特性の測温抵抗素子に対応可能な構成を特徴とする
プログラマブルコントローラの測温抵抗体入力モジュー
ル。6. A temperature measuring module of a programmable controller capable of forming a signal corresponding to a temperature of a temperature measuring object based on a resistance of a connected temperature measuring resistance element, wherein the temperature measuring is performed when a constant current flows. A temperature measuring resistor input module for a programmable controller, comprising: an identification circuit for identifying the temperature measuring resistance element according to a voltage drop level of the resistance element;
Priority Applications (1)
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|---|---|---|---|
| JP2001168211A JP4422365B2 (en) | 2001-06-04 | 2001-06-04 | Programmable controller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001168211A JP4422365B2 (en) | 2001-06-04 | 2001-06-04 | Programmable controller |
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| Publication Number | Publication Date |
|---|---|
| JP2002357484A true JP2002357484A (en) | 2002-12-13 |
| JP4422365B2 JP4422365B2 (en) | 2010-02-24 |
Family
ID=19010472
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|---|---|---|---|
| JP2001168211A Expired - Fee Related JP4422365B2 (en) | 2001-06-04 | 2001-06-04 | Programmable controller |
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| JP2009528522A (en) * | 2006-03-01 | 2009-08-06 | エーゲーオー エレクトロ・ゲレーテバウ ゲーエムベーハー | Method and apparatus for identifying a temperature sensor coupled to a control unit |
| KR101247810B1 (en) | 2010-11-19 | 2013-04-03 | 엘에스산전 주식회사 | Temperature controlling module |
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| JP2009528522A (en) * | 2006-03-01 | 2009-08-06 | エーゲーオー エレクトロ・ゲレーテバウ ゲーエムベーハー | Method and apparatus for identifying a temperature sensor coupled to a control unit |
| EP2302344A3 (en) * | 2009-09-29 | 2014-07-02 | Siemens Aktiengesellschaft | An apparatus for measuring temperature and method thereof |
| KR101247810B1 (en) | 2010-11-19 | 2013-04-03 | 엘에스산전 주식회사 | Temperature controlling module |
| CN103968969A (en) * | 2013-01-29 | 2014-08-06 | 西门子公司 | Temperature measuring device and chip of system on programmable chip |
| CN104422537A (en) * | 2013-08-19 | 2015-03-18 | 苏州能健电气有限公司 | Temperature signal acquisition circuit of PLC control system |
| WO2017121616A1 (en) * | 2016-01-14 | 2017-07-20 | BSH Hausgeräte GmbH | Domestic appliance comprising a temperature measurement circuit |
| DE102017007303A1 (en) | 2016-08-12 | 2018-02-15 | Fanuc Corporation | MOTOR CONTROL DEVICE, CONTROL METHOD AND CONTROL PROGRAM FOR SPECIFYING A TYPE OF TEMPERATURE SENSOR |
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| CN107728598B (en) * | 2016-08-12 | 2019-08-13 | 发那科株式会社 | Control device of electric motor, control method and computer-readable medium |
| DE102017007303B4 (en) * | 2016-08-12 | 2020-03-05 | Fanuc Corporation | ENGINE CONTROL DEVICE, CONTROL METHOD AND CONTROL PROGRAM FOR SPECIFYING A TYPE OF TEMPERATURE SENSOR |
| CN113557417A (en) * | 2019-03-01 | 2021-10-26 | 卡姆鲁普股份有限公司 | Utility meter including temperature sensor detection algorithm |
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| WO2021001561A1 (en) * | 2019-07-04 | 2021-01-07 | Ivoclar Vivadent Ag | Dental furnace |
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