3BDH000530R1处理器,PM803F使用书
HSS模块将MFP模块连接到伺服阀或I/H转换器，为MFP模块提供位置控制
燃料节流阀或蒸汽调节阀。HSS mod ule微处理器承担工作负载。它能够执行借助模块支持电路完成多项任务。微处理器提供所需的智能（固件）要中继来自MFP模块的位置需求，请读取位置反馈信息，设定输出目标，并呈现直接手动将模块状态信息发送给MFP模块控制并执行自检诊断。有七个功能块（见图2-2）：
•输入/输出扩展器总线接口。
•状态和数据缓冲区。
•微处理器。
•定位需求和输出。
•位置反馈输入。
•LVDT振荡器。
3BDH000530R1处理器数字I/O所有支持电路块都有助于微处理器指导模块活动和控制接口环电源通过模块安装进入电路板装置底板。输入/输出扩展器总线接口提供输入/输出与多功能处理器的模块通信单元位置需求电路执行位置需求的数字到模拟转换，而输出电路放大驱动伺服阀线圈的电流。A.
抖动振荡器防止燃油阀在一个位置冻结。位置反馈块解调来自的反馈LVDT次级并将其从模拟信号转换为数字数据。频率可选（400赫兹至15千赫）振荡器为LVDT一次侧提供励磁电压。
数字输入/输出电路为手动控制涡轮机节流阀提供隔离直流输入。如果MFP和HSS模块之间存在通信故障，则该电路使操作员能够控制涡轮机速度。数字输入/输出电路提供了手动控制液压系统的方法通过向伺服发送升高或降低信号来确定执行器位置阀门或I/H转换器。
The HSS module interfaces the MFP module to a servo valve or
I/H converter, providing the MFP module with position control
of a fuel throttle valve or steam governor valve. The HSS mod
ule microprocessor carries the workload. It is able to perform
multiple tasks with the help of the module support circuitry.
The microprocessor provides the intelligence (firmware) needed
to relay position demands from the MFP module, read position
feedback information, set targets for the output, and present
module status information to the MFP module, direct manual
control and perform self-check diagnostics. There are seven
functional blocks (see Figure 2-2):
•
I/O expander bus interface.
•
Status and data buffers.
•
Microprocessor.
•
Position demand and output.
•
Position feedback input.
•
LVDT oscillator.
Digital I/OAll the blocks of the support circuitry help the
microprocessor direct module activity and interface the control
loop. Power enters the board by way of the module mounting
unit backplane. The I/O expander bus interface provides I/O
module communication with the multi-function processor
module. The position demand circuitry performs digi
tal-to-analog conversion of position demands, while the output
circuitry amplifies the current driving the servo valve coils. A
dither oscillator prevents fuel valves from freezing in one posi
tion. The position feedback block demodulates feedback from
the LVDT secondary and converts it from an analog signal to
digital data. A frequency selectable (400 hertz to 15 kilohertz)
oscillator supplies the excitation voltage for the LVDT primary.
The digital I/O circuitry provides isolated DC inputs to manu
ally control the turbine throttle valve. If there is a communica
tion failure between the MFP and HSS modules, this circuitry
enables the operator to control turbine speed. The digital I/O
circuitry provides a means to manually control the hydraulic
actuator position by sending a raise or lower signal to servo
valve or I/H converter.
