ALSTOM BGTR8HE控制卡件
FBM214 HART通信輸入接口
模塊包含八個4至20 mA組隔離模擬輸入信道。FBM214支持任何標準4至20 mA裝置和HART的混合設備。
FBM214用作HART通信字段設備主機，使I/A系列系統(tǒng)能夠每秒請求和接收兩條數(shù)字消息來自現(xiàn)場設備。信息傳遞能力可用于支持HART通用，通用實踐和設備特定命令，但不是突發(fā)通信模式。這些命令使用智能現(xiàn)場設備配置器（IFDC）-參考詳情見PSS 21S-8A3 B3）。
FBM214提供公共隔離電源為所有八個通道供電?？蛇x地通道可由外部電源供電供給然而，當公共外部電源
電源用于兩個或多個信道，一根電纜需要平衡-不平衡變換器模塊以防止通道交叉說話
緊湊設計FBM214設計緊湊，堅固耐用擠壓鋁外殼，用于物理保護
電路。專為以下目的設計的外殼：安裝FBM可提供不同級別的環(huán)境保護，適用于惡劣環(huán)境
根據(jù)ISA標準S71.04。
高精度為了實現(xiàn)高精度，該模塊包含一個SigmaDelta轉換器，可提供新的模擬輸入
每100毫秒一個通道的值。特征
FBM214模塊的主要功能包括：
八個模擬輸入通道，每個通道接受一個
以下輸入：
?標準4至20 mA模擬傳感器信號
?數(shù)字HART頻移鍵控（FSK）
疊加在4至20 mA模擬上的信號輸入信號。
專用于每個輸入信道的FSK調制解調器
雙向數(shù)字通信HART現(xiàn)場設備
4至來自HART設備的20 mA輸入信號
支持HART通用命令
現(xiàn)場設備與I/A Series?系統(tǒng)數(shù)據(jù)庫
8組輸入的電流隔離接地和模塊邏輯通道
緊湊、堅固的設計，適用于G3級（惡劣）環(huán)境
通過sigma-delta數(shù)據(jù)實現(xiàn)高精度每個頻道的轉換
用于本地或將現(xiàn)場接線遠程連接至FBM214
每個通道內部的終端組件和/或外部環(huán)路供電的發(fā)射器。
The FBM214 HART Communication Input Interface
Module contains eight 4 to 20 mA group isolated
analog input channels. The FBM214 supports any
mix of standard 4 to 20 mA devices and HART
devices.
The FBM214 serves as a HART communications field
device host, enabling the I/A Series system to
request and receive two digital messages per second
from the field device. The message pass-through
capability can be used to support HART universal,
common practice, and device-specific commands,
but not the burst communication mode. These
commands are implemented using the Intelligent
Field Device Configurator (IFDC — refer to
PSS 21S-8A3 B3 for details).
The FBM214 provides a common isolated power
supply to power all eight channels. Optionally, the
channels can be powered by an external power
supply. However, when a common external power
supply is used with two or more channels, a Cable
Balun module is required to prevent channel cross
talk.
COMPACT DESIGN
The FBM214 has a compact design, with a rugged
extruded aluminum exterior for physical protection of
the circuits. Enclosures specially designed for
mounting the FBMs provide various levels of
environmental protection, up to harsh environments
per ISA Standard S71.04.
HIGH ACCURACY
For high accuracy, the module incorporates a SigmaDelta converter which can provide new analog input
values for each channel every 100 milliseconds. FEATURES
Key features of the FBM214 module are:
Eight analog input channels, each accepting one
of the following inputs:
? Standard 4 to 20 mA analog sensor signal
? Digital HART Frequency Shift Keying (FSK)
signal superimposed on a 4 to 20 mA analog
input signal.
FSK modem dedicated to each input channel for
bi-directional digital communications with a
HART field device
Analog to digital conversion of each of the 4 to
20 mA input signals from the HART devices
Support for the HART universal commands
necessary to interface the field device with the
I/A Series? system database
Galvanic isolation of the group of 8 input
channels from ground and module logic
Compact, rugged design suitable for enclosure in
Class G3 (harsh) environments
High accuracy achieved by sigma-delta data
conversions for each channel
Termination Assemblies (TAs) for locally or
remotely connecting field wiring to the FBM214
Termination Assemblies for per channel internally
and/or externally loop powered transmitters.
