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Programmable interface circuit for coupling field devices to process controllers

机译:可编程接口电路,用于将现场设备耦合到过程控制器

摘要

A programmable interface circuit (100) includes channel(s) including a digital logic block (110) having terminals (116e) for receiving control signals from a process controller block (170), terminals (111, 112) for providing logic signals (111a, 112a), and terminals for receiving processed signal data. An analog logic block (120) includes a current output digital to analog converter (DAC) (121). An output circuit block (140) includes first and second field terminals (S1,S2) and a sense resistor (146), wherein current from the DAC is coupled to S1 and the sense resistor is coupled to S2. The analog logic block includes a first and a second multi-channel multiplexer (MUX) (131, 132), an operational amplifier (135), and an analog to digital converter (ADC) (122). The control signals automatically select from signal modes including an analog output (AO) mode, a digital output (DO) mode, an analog input (AI) mode, a digital input (DI) mode, and at least one additional signal mode provided by adding a sub-mode to the AI mode or DI mode.
机译:可编程接口电路(100)包括通道,该通道包括数字逻辑块(110),其具有用于从过程控制器块(170)接收控制信号的端子(116e),用于提供逻辑信号(111a)的端子(111、112)。 ,112a)和用于接收处理后的信号数据的终端。模拟逻辑块(120)包括电流输出数模转换器(DAC)(121)。输出电路块(140)包括第一和第二场端子(S1,S2)和感测电阻器(146),其中来自DAC的电流耦合到S1,并且感测电阻器耦合到S2。模拟逻辑块包括第一和第二多通道多路复用器(MUX)(131、132),运算放大器(135)和模数转换器(ADC)(122)。控制信号会自动从以下信号模式中进行选择,这些模式包括:模拟输出(AO)模式,数字输出(DO)模式,模拟输入(AI)模式,数字输入(DI)模式以及由以下功能提供的至少一种其他信号模式:将子模式添加到AI模式或DI模式。

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