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FOXBORO 0399071D邏輯卡件
當(dāng)使用電阻溫度計時，常數(shù)電流必須流過傳感器電阻器，以便建立評估所需的電壓降單元模擬模塊提供兩個常量用于此目的的電流匯。下圖顯示了Pt100的配置和Pt1000電阻溫度計。模塊線性化溫度電阻曲線為Pt100/Pt1000配置2 mA和0.2 mA的集成電流匯也是在這些測量配置中進行補償。以下三段描述了分配集成電流匯的數(shù)量：連接至端子5至15（信道EA n，00至EA n，03），可使用端子16或17處的兩個接收器中只有一個（2 mA或0.2毫安）。連接至端子24至34（通道EA n，04至EA n，07），可以僅使用端子35或36處的兩個水槽中的一個（2毫安或0.2毫安）。同時使用Pt100和Pt1000傳感器是可能的一組傳感器（例如Pt100）可以是連接到上部端子，另一組（例如。Pt1000）至下部端子。端子7、10、13、26、29和32（標(biāo)有NC）可以用作當(dāng)前回路的連接標(biāo)記（請參見圖5.2.4–2）。獨立于模擬表示a或b–50°C…400°C的測量范圍線性分配給數(shù)字范圍為–1022…+8190（另請參見圖5.2.5–7至5.2.5–9）。如果輸入電壓超出測量范圍，則輸出+32767的溢出數(shù)。
如果輸入電壓下溢測量范圍，下溢數(shù)值輸出–32767的。
在這兩種情況下，錯誤消息都是通過CS31系統(tǒng)總線發(fā)送。如果電流回路中出現(xiàn)斷線（開路），輸出數(shù)字–32767。如果電線斷裂（開路電路），則數(shù)字+32767為輸出在這兩種情況下，都會通過CS31系統(tǒng)總線。如果未使用的Pt100/Pt1000通道將連接到一個跳線，它的電阻為0會假裝極低溫度的測量值。因此將輸出錯誤消息“Underflow”。整齊為了防止此類錯誤消息，未使用的Pt100/Pt1000通道應(yīng)按以下方式終止：120電阻Pt 100Pt 100 0，電阻為1200其他連接溫度相關(guān)電阻器原則上，所有溫度相關(guān)電阻器都可以連接到模塊而不是Pt100/Pt1000傳感器。作為配置，設(shè)置為+5 V、+500 mV和+50 mV適用。如有必要必須執(zhí)行溫度-電阻曲線使用PLC程序。集成電流匯可以使用。在執(zhí)行此操作時，必須遵守以下要求：–所有串聯(lián)電阻的電壓降不能大于7 V（使用0.2 mA的電流接收器），2.5 V（使用2 mA的電流接收器）。–集成電流匯的公差為+ 1,5 %. 中的模塊沒有補償此應(yīng)用程序。這與Pt100/Pt1000設(shè)置。
Resistance thermometers which are connected to the terminals 24 to 34 (channels EA n,04 to EA n,07), may use only one of the two sinks at the terminals 35 or 36 (2 mA or 0.2 mA). Use of Pt100 and Pt1000 sensors at the same time is possible. One group of the sensors (e.g. Pt100) can be connected to the upper terminals, the other group (e.g. Pt1000) to the lower terminals. The terminals 7, 10, 13, 26, 29 and 32 (labelled with NC) can be used as connecting tags for the current loops (see also Fig. 5.2.4–2). Independent of the analog representation a or b, the measuring range of –50°C...400°C is allocated linear to the number range of –1022...+8190 (see also the figures 5.2.5–7 to 5.2.5–9). If input voltages overflow the measuring range, the overflow number of +32767 is output. If the input voltage underflows the measuring range, the underflow number of –32767 is output. In both cases, an error message is sent via the CS31 system bus. If a broken wire (open circuit) occurs in the current loop, the number –32767 is output. If a broken wire (open circuit) occurs in the sensor line, the number +32767 is output. In both cases, an error message is sent via the CS31 system bus. If unused Pt100/Pt1000 channels would be connected to a wire jumper, its resistance of 0 would pretend the measuring value of a very low temperature. As a result, the error message ”Underflow” would be output. In order to prevent such error messages, unused Pt100/Pt1000 channels should be terminated as follows: Pt 100 by a resistor of 120 Pt 100 0 by a resistor of 1200 Connection of other temperature–dependent resistors In principle, all temperature–dependent resistors can be connected to the module instead of Pt100/Pt1000 sensors. As configurations, the settings + 5 V, + 500 mV and + 50 mV are suitable. If necessary, the linearization of the temperature–resistance curve must be performed with the PLC program. The integrated current sinks can be used. In doing so, the following has to be observed: – The voltage drop over all resistors circuited in series may not be greater than 7 V (using the current sink of 0.2 mA), 2.5 V (using the current sink of 2 mA). – The tolerance of the integrated current sinks is + 1,5 %. There is no compensation by the module in this application. This is a difference compared with the Pt100/Pt1000 settings.
