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FBM208 冗余模擬輸入
具有高可用性要求的單輸入/單輸出控制方案可以利用FBM208作為冗余對(duì)的優(yōu)勢(shì)。提供了一個(gè)檢測(cè)輸出通道故障的回讀功能。在維修情況下，當(dāng)更換單個(gè)模塊時(shí)，輸入和輸出由冗余模塊維護(hù)。HART?信號(hào)與4-20 mA信號(hào)電氣兼容，允許工廠升級(jí)現(xiàn)場(chǎng)設(shè)備而無需更改控制系統(tǒng)。fbm208b提供相同的功能，用于從舊的fbm05升級(jí)。
冗余的一對(duì)模塊組合在FieldbusModule (FBM)級(jí)別提供冗余，與現(xiàn)場(chǎng)I/O連接到一個(gè)公共終端組件(參見圖1，第4頁)。每個(gè)模塊獨(dú)立地嘗試將輸出保持在其指定的輸出值，并且每個(gè)模塊獨(dú)立地報(bào)告其觀察到的輸入值。
Foxboro?dcs控制軟件中的冗余模擬輸入和冗余模擬輸出塊與模塊的信息一起驗(yàn)證每個(gè)輸入和輸出。
FBM208與標(biāo)準(zhǔn)hart信號(hào)在電氣上兼容。
特點(diǎn):
?4個(gè)0至20 mA直流模擬輸入通道
?4個(gè)0至20 mA直流模擬輸出通道與回讀
?將FBM的輸出值與當(dāng)前讀回值進(jìn)行比較。如果回讀值與期望輸出相差±2%以上，則FBM將其輸出通道標(biāo)記為BAD
?監(jiān)控FBM的內(nèi)部通道電流環(huán)路功率，并標(biāo)記通道BADif功率小于16v dc
?標(biāo)記通道壞導(dǎo)致冗余模塊中相應(yīng)的通道繼續(xù)驅(qū)動(dòng)輸出
?冗余模塊提高可靠性
?終端組件(TAs)用于本地或遠(yuǎn)程連接現(xiàn)場(chǎng)布線到fbm208
FBM208 冗余模擬輸入
Single input/single output control schemes with high availability requirements can takeadvantage of the FBM208 arranged as a redundant pair. A readback feature isprovided that detects failures of the output channel. In a repair situation, when a singlemodule is replaced, the inputs and outputs are maintained by the redundant module. HART? signals are electrically compatible with the 4-20 mA signals, permitting theplant to upgrade field devices without the need to change the control system. TheFBM208b provides the same functionality and is used to upgrade from the olderFBM05.
A redundant pair of the modules combine to provide redundancy at the FieldbusModule (FBM) level, with field I/O wired to one common termination assembly (seeFigure 1, page 4). Each module independently attempts to hold the output(s) at itsspecified output value(s), and each independently reports its observed value of theinputs.
A redundant analog input and redundant analog output block in the Foxboro? DCSControl Software validates each input and output in conjunction with information to/from the module.
The FBM208 is electrically compatible with standard HARTsignals.
Features:
? Four 0 to 20 mA dc analog input channels
? Four 0 to 20 mA dc analog output channels with readback
? Compares FBM’s output value with the current readback value. If the readbackvalue differs from the desired output by more than ± 2%, the FBM marks itsoutput channel BAD
? Monitors FBM’s internal channel current loop power and marks the channel BADif power is less than 16 V dc
? Marking a channel Bad causes the corresponding channel in the redundantmodule to continue to drive the outputs
? Redundant modules increase reliability
? Termination Assemblies (TAs) for locally or remotely connecting field wiring to theFBM208
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Chengdu Sunshine Xihe Co., Ltd. specializes in one-stop procurement consulting for imported industrial spare parts, offering original equipment and professional discontinued parts services. We are committed to providing efficient and reliable automation solutions for our customers. Customer support fast responseThe network of partners spans all continentsGlobal partner networkAlways achieve more delivery, be it parts, service or speed
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