3BHE044477P3數(shù)模轉(zhuǎn)換模塊
單通道控制卡
單通道控制卡執(zhí)行以下控制功能：氣體檢測單回路如下：
a、 處理輸入的傳感器驅(qū)動(dòng)模塊信號(hào)。
b、 在前面板液晶顯示器上顯示信號(hào)電平。
c、 將信號(hào)電平與預(yù)定義的報(bào)警限值進(jìn)行比較。
d、 當(dāng)超過預(yù)定義的報(bào)警限值時(shí)，引發(fā)報(bào)警
通過點(diǎn)亮前面板LED并操作可選連接繼電器。
e、 將報(bào)警狀態(tài)信息通知其他卡。
f、 自我驗(yàn)證其電路組件、軟件的操作傳感器的操作和狀況。
4.3傳感器驅(qū)動(dòng)模塊
提供了兩個(gè)傳感器驅(qū)動(dòng)模塊：
a、 傳感器驅(qū)動(dòng)模塊，4-20mA，零件號(hào)05701-a-0283
b、 傳感器驅(qū)動(dòng)模塊催化，零件號(hào)05701-A-0284
傳感器驅(qū)動(dòng)模塊調(diào)節(jié)輸入的催化或4-
20mA傳感器信號(hào)，并提供必要的傳感器電源。
它包含生成電壓所需的所有電路，以及驅(qū)動(dòng)傳感器所需的電流，獲取并將傳感器信號(hào)縮放為標(biāo)準(zhǔn)輸出。這個(gè)
傳感器驅(qū)動(dòng)模塊在工廠安裝，并直接插入信道控制卡。
4.4模擬輸出模塊
可選模擬輸出模塊（零件號(hào)05701-A-0285），可在工廠安裝到單通道控制卡，并使用
在氣體檢測通道上提供隔離電流回路
跟隨傳感器信號(hào)電平的輸出。這可以設(shè)置
以電子方式產(chǎn)生0-20mA輸出或4-20mA的輸出，以及可用于操作圖表記錄器等。
單通道控制卡物理布局
單通道控制卡的物理布局如下所示。
傳感器驅(qū)動(dòng)模塊插入14路接頭J1和J2
而模擬輸出模塊在安裝時(shí)插入J3和J4.Link
LK1僅在MkII卡上可用，單獨(dú)通電時(shí)使用
控制卡參見第4章第16.2節(jié)現(xiàn)場接口和繼電器卡
5.1概述現(xiàn)場接口卡和四種類型的中繼卡提供
單通道控制卡和現(xiàn)場接線之間的接口。
5.2現(xiàn)場接口卡（零件號(hào)05701-A-0326）
5.2.1概述
用于帶有主繼電器的系統(tǒng)。用于除主人提供傳感器和控制卡之間的連接只有沒有安裝繼電器。
Single Channel Control Card
The Single Channel Control Card carries out the control functions for a
single loop of gas detection as follows:
a. Processes the incoming sensor drive module signal.
b. Displays the signal level on the front panel liquid crystal display.
c. Compares the signal level with pre-defined alarm limits.
d. When the pre-defined alarm limits are exceeded, raises the alarms
by lighting up front panel LEDs and operating optional connected
relays.
e. Informs other cards with the alarm status information.
f. Self validates the operation of its circuit components, software
operation and the condition of the sensor.
4.3 Sensor Drive Modules
Two sensor drive modules are provided:
a. Sensor Drive Module, 4 - 20mA, Part Number 05701-A-0283
b. Sensor Drive Module Catalytic, Part Number 05701-A-0284
The Sensor Drive Module conditions the incoming catalytic or 4 -
20mA sensor signal and provides the necessary sensor power supply.
It contains all the circuitry necessary to generate the voltages and
currents required to drive the sensor, the circuitry to acquire the
sensor signal and to scale the sensor signal to a standard output. The
sensor drive modules are factory fitted and plug directly onto the
channel control card.
4.4 Analogue Output Module
An optional Analogue Output Module, (Part Number 05701-A-0285),
may be factory fitted to the Single Channel Control Card and is used
on a channel of gas detection to provide an isolated current loop
output which follows the sensor signal level. This may be set
electronically to produce a 0 - 20mA output or a 4 - 20mA output and
can be used to operate a chart recorder, etc.
Single Channel Control Card Physical Layout
The physical layout of the Single Channel Control Card is shown below.
The Sensor Drive Modules plug into the 14-way connectors J1 and J2
while the Analogue Output Module, when fitted, plugs into J3 and J4. Link
LK1, available on MkII cards only, is used when individually powering
control cards See Chapter 4, Section 16.2.FIELD INTERFACE AND RELAY CARDS
5.1 General
The Field Interface Card and the four types of relay card provide the
interface between a Single Channel Control Card and the field wiring.
5.2 Field Interface Card (Part Number 05701-A-0326)
5.2.1 General
For use in systems with master relays. Used on all channels except the
master. Provides connections between the sensor and the control card
only. No relays fitted.
