1785-L30B是Allen-Bradley控制器，属于PLC5控制器系列。该控制器具有32k字用户存储器，两(2)个DH+/远程I/O组合端口，可为适配器或扫描仪配置，一(1)个串行端口，支持RS-232、423和RS-422A通信标准。

1785-L30B支持大量I/O设备。它支持多达1024个I/O设备，这些设备可以由离散和模拟输入和输出设备的任意组合组成。此外，它还支持互补的1024输入和1024输出设备。

除了支持大量I/O设备之外，该控制器还能够实施远程I/O架构，因为它最多可以连接到28个远程I/O机架。为了实现远程I/O架构，可以利用集成通信端口，例如DH+和远程I/O (RIO)通道。此外，可以添加以太网接口模块，以在以太网上实现相同的架构。

1785-L30B安装有电池，当控制器断电时，控制器使用该电池。该电池维护存储在控制器用户存储器中的用户和程序数据。它配有一个电池指示灯LED，用于报告电池的当前电量。对于1785-L530B，在60摄氏度的工作温度下，100%断电时，电池可持续工作84天；50%断电时，电池可持续工作150天。当电池LED发光时，电池从信号第一次出现起保持工作5天。当电池电量完全耗尽时，除非控制器通电，否则用户存储器的内容将保持不变。只有在断电和电池耗尽时，它才会被擦除。

1785-L30B有两个内置端口，如1A频道和1B频道。这些端口能够配置为远程I/O扫描仪、远程I/O适配器和DH+通信接口。此外，1785-L30B控制器配有一个25针连接器串行端口接口。该串行端口支持RS232C标准，并可针对ASCII和DF1等系统协议进行配置。全双工和半双工主协议以及半双工从协议。还提供了一个标记为1A通道的8针迷你DIN连接器，也支持DH+连接。

1785-L30B的前面板上有几个指示灯，用于方便与用户交互。这些指示器标记为BATT，用于显示电池的状态。标有PROC的指示器指示控制器状态。力指示器用于指示是否启用了I/O力。通信指示器与信道0链接，用于报告通信活动，而信道1A和1B都具有专用的状态指示器。

控制器有一个三位按键开关，用于设置控制器模式。每个位置对应于处理器的一种模式，如Run、PROG和REM。当处于运行模式时，控制器执行程序并激活输出设备。PROG停止逻辑执行，并允许控制器配置和编程。REM执行逻辑程序，并允许配置和编程。

1785-L30B有32000字的内存和备用电池。对于程序备份，可在前面板插槽中安装EEPROM模块。有多种内存模块容量可供选择。I/O总数(包括本地I/O和通用远程I/O组合)为1024个任意组合，或1024个输入和1024个输出互补。1785-L30B总共可以使用29个I/O机箱，其中28个可以是通用远程I/O机箱。背板的电流负载为1785-L30B在5伏电压下为2.3安培。1785-L30B不具备连接扩展本地I/O机箱的能力。

1785-L30B

1785-L30B is an Allen Bradley controller, belonging to the PLC5 controller series. This controller has a 32k word user memory, two (2) DH+/remote I/O combination ports that can be configured for adapters or scanners, one (1) serial port, and supports RS-232, 423, and RS-422A communication standards.

1785-L30B supports a large number of I/O devices. It supports up to 1024 I/O devices, which can be composed of any combination of discrete and analog input and output devices. In addition, it also supports complementary 1024 input and 1024 output devices.

In addition to supporting a large number of I/O devices, this controller can also implement a remote I/O architecture as it can connect to up to 28 remote I/O racks. To achieve a remote I/O architecture, integrated communication ports such as DH+and remote I/O (RIO) channels can be utilized. In addition, Ethernet interface modules can be added to achieve the same architecture on the Ethernet.

1785-L30B is equipped with a battery, which is used by the controller when it loses power. This battery maintains user and program data stored in the controller’s user memory. It is equipped with a battery indicator LED to report the current battery level. For 1785-L530B, at a working temperature of 60 degrees Celsius, with 100% power outage, the battery can continue to operate for 84 days; When 50% of the power is cut off, the battery can continue to operate for 150 days. When the battery LED lights up, the battery remains in operation for 5 days from the first appearance of the signal. When the battery is completely depleted, the content of user memory will remain unchanged unless the controller is powered on. It will only be erased when there is a power outage and the battery is depleted.

1785-L30B has two built-in ports, such as channel 1A and channel 1B. These ports can be configured as remote I/O scanners, remote I/O adapters, and DH+communication interfaces. In addition, the 1785-L30B controller comes with a 25 pin connector serial port interface. This serial port supports the RS232C standard and can be configured for system protocols such as ASCII and DF1. Full duplex and half duplex master protocols, as well as half duplex slave protocols. It also provides an 8-pin mini DIN connector labeled as 1A channel, which supports DH+connection.