3BHE044477P3数模转换模块
单通道控制卡
单通道控制卡执行以下控制功能：气体检测单回路如下：
a、 处理输入的传感器驱动模块信号。
b、 在前面板液晶显示器上显示信号电平。
c、 将信号电平与预定义的报警限值进行比较。
d、 当超过预定义的报警限值时，引发报警
通过点亮前面板LED并操作可选连接继电器。
e、 将报警状态信息通知其他卡。
f、 自我验证其电路组件、软件的操作传感器的操作和状况。
4.3传感器驱动模块
提供了两个传感器驱动模块：
a、 传感器驱动模块，4-20mA，零件号05701-a-0283
b、 传感器驱动模块催化，零件号05701-A-0284
传感器驱动模块调节输入的催化或4-
20mA传感器信号，并提供必要的传感器电源。
它包含生成电压所需的所有电路，以及驱动传感器所需的电流，获取并将传感器信号缩放为标准输出。这个
传感器驱动模块在工厂安装，并直接插入信道控制卡。
4.4模拟输出模块
可选模拟输出模块（零件号05701-A-0285），可在工厂安装到单通道控制卡，并使用
在气体检测通道上提供隔离电流回路
跟随传感器信号电平的输出。这可以设置
以电子方式产生0-20mA输出或4-20mA的输出，以及可用于操作图表记录器等。
单通道控制卡物理布局
单通道控制卡的物理布局如下所示。
传感器驱动模块插入14路接头J1和J2
而模拟输出模块在安装时插入J3和J4.Link
LK1仅在MkII卡上可用，单独通电时使用
控制卡参见第4章第16.2节现场接口和继电器卡
5.1概述现场接口卡和四种类型的中继卡提供
单通道控制卡和现场接线之间的接口。
5.2现场接口卡（零件号05701-A-0326）
5.2.1概述
用于带有主继电器的系统。用于除主人提供传感器和控制卡之间的连接只有没有安装继电器。
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.
