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仅使用两个模拟元件的灵活的plc/DC模拟输出模块

消耗积分:0 | 格式:rar | 大小:0.12 MB | 2017-07-12

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  仅使用两个模拟元件的灵活的plc/DC模拟输出模块

  一些可编程逻辑控制器(PLC)和分布式控制系统(DCS)应用需要一个功能齐全、灵活、可编程的模拟输出解决方案。图1所示的电路可以完成这一工作。它只有两个模拟元件,满足了PLC和DCS应用的大部分要求。的ad5660-1低功率(2.8兆瓦@ 5 V),轨到轨输出,16位®nanoDAC,结合ad5750-1工业电流/电压输出驱动器,提供了所有典型的电流和电压输出范围为16位分辨率和无失码,0.05%度,小于0.1%的输出误差。该电路还包含工业应用的关键特性,如片上输出故障检测、CRC校验以防止数据包错误(PEC)和灵活的上电选项,这是鲁棒工业控制系统的理想选择。无需外部精密电阻或校准程序,以保持在大批量生产一致的性能,从而使其成为PLC或DCS模块的理想选择。

  仅使用两个模拟元件的灵活的plc/DC模拟输出模块

  Figure 1: Basic analog output circuit for single channel (simplified schematic, all connections and protection circuits not shown)。

  Circuit description

  The AD5750/AD5750-1 are single-channel, low cost, precision voltage/current output drivers developed to meet the requirements of industrial process control applications. The voltage output range can be programmed for the standard output ranges for PLC and DCS applications: 0 V to 5 V, 0 V to 10 V, −5 V to +5 V, and −10 V to +10 V. A 20 percent overrange setting is also provided for the standard ranges, giving the following options: 0 V to 6 V, 0 V to 12 V, −6 V to +6 V, and −12 V to +12 V.

  The current output, which is provided on a separate pin, can be programmed for the ranges of 4 mA to 20 mA, 0 mA to 20 mA, −20 mA to +20 mA, 0 mA to 24 mA, and −24 mA to +24 mA. The unipolar ranges have a two percent overrange setting. Because the AD5750/AD5750-1 current output can either source or sink current, it can interface to a wide variety of sensors or actuators. The voltage and current output pins can be tied together to configure the end system as a single-channel output if desired.

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