1794-OE4 是一款 Flex I/O 模拟输出模块

Allen-Bradley 1794-OE4 是 Flex IO 产品系列的模拟输出模块。该模块用作分布式 I/O 节点的组件，与 Flex I/O 通信适配器（如以太网、ControlNet、Profibus 和远程 I/O）兼容。该模块具有四 （4） 个用户可配置输出通道，旨在提供 0 至 20mA、4 至 20 mA 电流信号以及 +/- 10VDC 和 0 至 10 VDC 电压信号信号。使用该模块可实现调制设备的自动和手动控制，例如变频驱动器 （VFD）、调制控制阀、转换器、传感器、阻尼器、百叶窗和其他最终控制元件 （FCE）。该模块的输出通道支持非隔离式单端配置。

1794-OE4 的分辨率为 12 位加号，电压的特定增减为 2.56mV/cnt，电流的特定增减为 5.13μA/cnt。模块的模拟数据存储为左对齐的寄存器格式，即 16 位 2 的补码。该寄存器使用脉宽调制方法进行转换。

1794-OE4 支持使用 Flex I/O 通信适配器进行安装，包括 1794-ACN15、1794-ACNR15、1794-AND、1794-AENT 和 1794-AENTR。它还可以通过 1794-ASB 和 1794-APB 通信适配器与 MicroLogix 紧凑型控制器一起使用。

1794-OE4 兼容各种终端底座，例如 1794-TB2、1794-TB3、1794-TB3S、1794-TB3T、1794-TB3TS 和 1794-TBN。只需一 （1） 个终端底座即可安装模块。端子底座提供DIN导轨连接以及输出信号接线端接点。1794-OE4 所需的按键开关位置为 4。

该模块的尺寸为 94.0 x 94.0 x 53.3 毫米或 3.7 x 3.7 x 2.1 英寸。它有一个内置的组诊断 LED，由一 （1） 个绿色/红色电源/状态指示灯组成。

1794-OE4 配有绿色状态指示灯，用于监控模块的运行情况。该模块不需要校准。该模块的输出分辨率为 12 位 + 符号，电压为 2.56 mV/cnt，电流输出为 5.13 μA/cnt。它使用脉宽调制作为其输出转换类型，所有通道的输出转换速率为 1.024 毫秒。

1794-OE4 模块在 25 摄氏度时的电流输入精度为 0.425% 满量程，电流输入精度随温度漂移为每摄氏度满量程 0.0069%。其电压输入精度在 25 摄氏度时为 0.133% 满量程，每摄氏度电压输入精度随温度漂移为 0.0045%。

该模块的输出信号范围为 4 至 20 mA、0 至 20 mA、+/-10 伏和 0 至 10 伏。1794-OE4 在 24 V DC 时还具有 70 mA 的外部直流电源电流。没有单独的通道是隔离的，但模块在 I/O 和系统之间具有 50 V 的连续隔离电压。该器件的电压或输入端子的输入阶跃响应时间为 24 毫秒，总线额定电流为 20 mA。该模块具有 24 毫秒（电压输出）阶跃响应时间，最高可达满量程设置的 63%。它在电压输出端具有 3 mA 的最大电流负载，输出电流具有 15 至 750 Ω的电阻负载。该模块在 31.2 伏直流电时的最大功耗为 4.5W，在 31.2 伏直流电下的最大热耗散为 15.3 BTU/小时。它还具有 0 至 55 摄氏度的工作温度范围。

1794-OE4 是一款 Flex I/O 模拟输出模块

Allen-Bradley 1794-OE4 is an analog output module for the Flex IO product family. The module is used as a component of a distributed I/O node and is compatible with Flex I/O communication adapters such as Ethernet, ControlNet, Profibus, and Remote I/O. The module features four (4) user-configurable output channels designed to provide 0 to 20mA, 4 to 20mA current signals as well as +/- 10VDC and 0 to 10VDC voltage signal signals. The module enables automatic and manual control of modulation devices such as variable frequency drivers (VFDS), modulation control valves, converters, sensors, dampers, shutters and other final control elements (FCE). The output channel of the module supports a non-isolated single-ended configuration.

The resolution of the 1794-OE4 is a 12-bit plus sign with a specific increase or decrease in voltage of 2.56mV/cnt and a specific increase or decrease in current of 5.13μA/cnt. The analog data of the module is stored in a left-justified register format, i.e., a 16-bit 2's complement. The register is converted using pulse width modulation.

The 1794-OE4 supports installation using Flex I/O communication adapters, including 1794-ACN15, 1794-ACNR15, 1794-AND, 1794-AENT, and 1794-AENTR. It can also be used with MicroLogix compact controllers via the 1794-ASB and 1794-APB communication adapters.

The 1794-OE4 is compatible with various terminal mounts, such as the 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, 1794-TB3TS, and 1794-TBN. Only one (1) terminal base is required to mount the module. The terminal base provides DIN rail connections and output signal terminal contacts. 1794-OE4 The required key switch position is 4.

The module measures 94.0 x 94.0 x 53.3 mm or 3.7 x 3.7 x 2.1 inches. It has a built-in group diagnostic LED consisting of one (1) green/red power/status indicator.

The 1794-OE4 is equipped with a green status indicator to monitor the operation of the module. The module does not require calibration. The module has an output resolution of 12-bit + symbol, a voltage of 2.56 mV/cnt, and a current output of 5.13 μA/cnt. It uses pulse width modulation as its output conversion type, with an output conversion rate of 1.024 ms for all channels.

The 1794-OE4 module has a current input accuracy of 0.425% full scale at 25 degrees Celsius, and the current input accuracy drifts with temperature to 0.0069% per degree Celsius full scale. The voltage input accuracy is 0.133% full scale at 25 degrees Celsius, and the voltage input accuracy per degree Celsius drifts to 0.0045% with temperature.

The module's output signals range from 4 to 20 mA, 0 to 20 mA, +/-10 volts, and 0 to 10 volts. The 1794-OE4 also has 70 mA external DC supply current at 24 V DC. No individual channel is isolated, but the module has a continuous isolation voltage of 50 V between I/O and the system. The device has a voltage or input terminal input step response time of 24 ms and a bus current rating of 20 mA. The module has a 24 ms (voltage output) step response time up to 63% of full scale Settings. It has a maximum current load of 3 mA at the voltage output, and the output current has a resistance load of 15 to 750 Ω. The module has a maximum power consumption of 4.5W at 31.2 volts DC and a maximum heat dissipation of 15.3 BTU/ hour at 31.2 volts DC. It also has an operating temperature range of 0 to 55 degrees Celsius.