基本信息：1769-OF8C 紧凑型输入/输出模块 用于驱动控制回路的最终控制元件
Allen-Bradley 1769-OF8C是紧凑型输入/输出模块。该模块与1769和某些1768 CompactLogix控制器以及MicroLogix 1500控制器兼容使用。该模块是一个模拟输出模块，通常用于驱动控制回路的最终控制元件(FCE)以及向接收和测量元件发送信号。
1769-OF8C主要具有八(8)个单端电流输出通道，可配置为0-20 mA和4-20 mA。它内置16位数模转换器(DAC ),分辨率分别为15.59位、0.323 A/位(适用于4-20 mA电流)和15.91位、0.323 A/位(适用于0-20 mA电流)。所有通道的转换速率均为5ms，63%输出的阶跃响应小于2.9 ms，模拟输出范围为0-21 mA和3.2-21 mA。
可由1769-OF8C驱动的典型最终控制元件(FCE)是调制控制阀、变频驱动器(VFD)、定位器和其他设备。为了在自动控制回路中使用，该模块可以集成到嵌入在处理器内的比例+积分+微分(PID)控制器中。可以从该设备接收信号的兼容接收和测量元件是面板仪表、数据记录器、信号分离器和其他类似类型的设备。
1769-OF8C是一个单宽模块，可作为本地I/O和扩展I/O机架的一部分安装在1769和1768 CompactLogix组件上。它也可以与MicroLogix 1500控制器一起使用。
Allen-Bradley 1769-OF8C可支持多达8个通道的同步模拟电流输出。在模块的正面，有一个LED指示灯，当模块没有遇到问题时，该指示灯会亮起绿色。如果检测到开环情况，该状态LED灯可以警告用户。该模块还具有过流和过压保护功能。1769-OF8C紧凑型Logix系列电流输出模块需要24伏DC额定外部电源，它包括通道到地面的隔离。所有输出都具有16位分辨率。1769-OF8C输出模块包括一个集成的可拆卸接线盒，对连接到执行机构的接线进行手指安全保护。该端子板位于输出模块前面的门后。该模块见的接线方式是从模块下方布线至输出端子。1769-OF8C也有一个替换门套件，它使用22×14 AWG尺寸的实心铜线。1769-OF8C的输出阻抗大于1欧姆，并且具有短路保护。该模块可在0至60摄氏度的温度范围内运行。它在25摄氏度时的精度为满量程的0.35%。1769-OF8C的重量约为0.28千克，尺寸为4.65英寸x 1.38英寸x 3.43英寸。
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1769-OF8C
The Allen-Bradley 1769-OF8C is Compact I/O module. This module is compatible for use with the 1769 and some 1768 CompactLogix controllers as well as with the MicroLogix 1500 controllers. This module is an analog output module, typically used for driving Final Control Elements (FCE) of a control loop as well as deliver signals to receiving and measuring elements.
The 1769-OF8C mainly features Eight (8) Single-ended current output channels, configurable for 0-20 mA and 4-20 mA. It features 16-bit Digital to Analog Converter (DAC), with specific resolution of 15.59 bits, 0.323 µA/bit for 4-20 mA and 15.91 bits, 0.323 µA/bit for 0-20 mA. It has a conversion rate of 5ms on all channels and step response to 63% output of less than 2.9 ms. The analog output range is 0-21 mA and 3.2-21 mA.
Typical Final Control Elements (FCE) that can be driven by the 1769-OF8C are Modulating Control Valves, Variable Frequency Drives (VFD), Positioners and other devices. To be used in automatic control loop, this module may be integrated to a Proportional + Integral + Derivative (PID) controller that is embedded within the processor. Compatible receiving and measuring elements that can receive signal from this device are panel meters, data loggers, signal splitters and other similar type of devices.
The 1769-OF8C is a single width module, that can be installed along the 1769 and 1768 CompactLogix assembly as local I/O and part of the expansion I/O rack. It may also be used with MicroLogix 1500 controller.
The Allen-Bradley 1769-OF8C can support up to 8 channels of simultaneous analog current output. On the front side of the module, there is one LED indicator that energizes Green when the module is not experiencing problems. This status LED light can warn the users if it detects an open-loop condition. The module also has overcurrent and overvoltage protection features. The 1769-OF8C Compact Logix series current output module requires a 24 Volts DC rated external power supply and it includes channel-to-earth ground isolation. All of the outputs have a 16-bit resolution. The 1769-OF8C output module includes an integral removable terminal block with finger-safe protection for the wiring to the actuators. This terminal block can be found behind a door at the front of the output module. The most common way of wiring this module is by routing it from beneath the module to the output terminals. The 1769-OF8C also has a replacement door kit and it uses a solid copper wire with a 22 by 14 AWG size. The output impedance for the 1769-OF8C is more than 1 Ohm and it is protected from short-circuiting. The module is built to operate at a temperature range of 0 to 60 degrees Celsius. Its accuracy at 25 degrees Celsius is ±0.35% of the full scale. The 1769-OF8C is shipped with an approximate weight of 0.28 kilograms, and it measures 4.65 inches x 1.38 inches x 3.43 inches.
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