D20 Status Input Module
The D20 Status module is composed of two detachable modules, WESTERM D20 S and WESDAC D20 S. The bottom module, WESTERM D20 S, is where all field wirings are terminated. The top module, WESDAC D20 S, processes the data acquired and communicates this to the main D20 processor.
The D20 Remote Terminal Unit (RTU) design is based on a distributedprocessing architecture including real-time data acquisition and control software. These I/O modules can be located close to the primary equipment being monitored and controlled as they receive and send data back to the master D20 main processor.
The I/O modules are intelligent modules that contain on-board microprocessors and are configured as slave devices to the D20 main processor. In the Figure 1 pictorial setup, specific I/O processing is distributed throughout the D20 RTU to the appropriate I/O modules.
The I/O modules support two communication protocols: (1) DNP 3 protocol, and (2) high speed, high-level data link controller (D.20 Link, HDLC) protocol. The peripheral modules have serial communication ports and various types of field connections.
The hardware construction of each remote I/O module type is similar
D20 Status Input Termination Types
D20S 64 digital inputs, standard version Compression
D20SD 64 digital inputs, standard version DB25
D20SX 64 digital inputs, standard version Disconnect
D20SB 64 digital inputs, standard version Barrier
D20SZ 64 digital inputs, high-voltage version HV Compression
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D20状态输入模块
D20状态模块由两个可拆卸模块组成，WESTERM D20S和WESDAC D20S。底部模块WESTERM D20S是所有现场接线的终端。顶部模块WESDAC D20 S处理采集的数据，并将其传送至主D20处理器。
D20远程终端单元（RTU）设计基于分布式处理架构，包括实时数据采集和控制软件。当这些I/O模块接收数据并将数据发送回主D20主处理器时，它们可以位于被监视和控制的主设备附近。
I/O模块是包含车载微处理器的智能模块，配置为D20主处理器的从属设备。在图1的图形设置中，特定的I/O处理分布在整个D20 RTU中，并分配到相应的I/O模块。
I/O模块支持两种通信协议：（1）DNP 3协议和（2）高速、高级数据链路控制器（D.20链路、HDLC）协议。外围模块具有串行通信端口和各种类型的现场连接。
各远程I/O模块类型的硬件结构相似
D20状态输入端接类型
D20S 64数字输入，标准版压缩
D20SD 64数字输入，标准版DB25
D20SX 64数字输入，标准版断开
D20SB 64数字输入，标准版屏障
D20SZ 64数字输入，高压版高压压缩
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