ABB 工業(yè)觸摸屏 PP系列 PP877 3BSE069272R2 PP875 3BSE092977R1 PP865 3BSE042236R1

PP877 3BSE069272R2 PP875 3BSE092977R1 PP865 3BSE042236R1

有關(guān)4線RTD配置的更多信息，參見電路筆記CN-0381。?
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在3線模式下，來自AIN4的引腳補(bǔ)償激勵(lì)電流也會(huì)流經(jīng)3 kΩ返回電阻，在AIN0處產(chǎn)生一個(gè)附加電壓：250 μA × 3 kΩ = 0.75 V。因此，AIN0處的總電壓等于2.71 V + 0.75 V = 3.46 V，這違反了裕量要求。 所以，在3線模式下，各激勵(lì)電流必須降至100 μA以提供足夠的裕量。?
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PGA增益可用來提高測(cè)量分辨率。 對(duì)于Pt100 RTD，建議使用8倍增益（因?yàn)镻t100值比Pt1000值小10倍）。?
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為實(shí)現(xiàn)所需精度，RTD本身必須由主機(jī)控制器通過軟件進(jìn)行線性化，參見電路筆記CN-0383。?
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熱電偶測(cè)量?
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如圖3所示，熱電偶連接在AIN+和AIN?端子之間。 AIN4引腳為熱電偶提供3.3 V ÷ 2 = 1.65 V的偏置電壓。 熱電偶電壓在AIN1和AIN3之間測(cè)量，因?yàn)闊犭娕夹盘?hào)非常小，通常推薦使用32倍或64倍的PGA增益。?

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PM861AK01 - ABB ADVANT-800XA - PM861A Processor Unit Kit 3BSE018157R1
PM861K01 - ABB ADVANT-800XA - PM861 Processor Module 3BSE018105R1
PM861K02 - ABB ADVANT-800XA - PM861 Processor Module 3BSE018160R1
PM864 - ABB ADVANT-800XA - AC800M Module PM864A
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RAIO-01 - ABB ADVANT-800XA - RAIO-01 Analog I/O Extension Module
RLM01 - ABB ADVANT-800XA - RLM01 Redundancy Link Module RLM-01
RX835 - ABB ADVANT-800XA - Touch Cover for PP835 Panel 3BSE042247R1
SB822 - ABB ADVANT-800XA - SB822 Rechargeable Battery Unit 3BSE018172R1
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TK801V006 - ABB ADVANT-800XA - TK801V006 Modulebus Extension Cable 3BSC950089R2
TK811V015 - ABB ADVANT-800XA - TK811V015 POF Cable 1.5m Duplex 3BSC950107R1
TK812V015 - ABB ADVANT-800XA - POF Cable 1.5 m Simplex 3BSC950118R1
TK812V050 - ABB ADVANT-800XA - POF Cable 5 m Simplex 3BSC950118R2
TP851 - ABB ADVANT-800XA - Base Unit for PROFIBUS DP Interface 3BSE018118R1
TP854 - ABB ADVANT-800XA - Base Unit for DP-V1 Interface CI854 3BSE025349R1
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TU848 - ABB ADVANT-800XA - Module Termination Unit 3BSE042558R1
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