发明名称 |
Analog interface circuits for process controllers and process monitors |
摘要 |
An interface circuit for use with process controllers permits analog signals to be input to a process controller through a binary interface of the process controller and permits analog signals to be output from the process controller through the binary interface. The input analog signal is converted to a digital sample of N bits. An identification pulse and the N bits of the digital sample are transmitted to the process controller at a rate selected for compatibility with the scan time of the process controller. The process controller includes a software routine for recognizing the identification pulse and the N bits of the digital sample. An equivalent approach is used for outputting analog signals through a binary interface of a process controller. The interface circuit can include multiple channels for inputting or outputting multiple analog signals.
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申请公布号 |
US5416480(A) |
申请公布日期 |
1995.05.16 |
申请号 |
US19940225234 |
申请日期 |
1994.04.08 |
申请人 |
INTERACTIVE PROCESS CONTROLS CORP. |
发明人 |
ROACH, KEVIN V.;LITTLEJOHN, DAVID C.;CALVIN, JAMES G. |
分类号 |
G06F3/05;G05B15/02;G05B19/042;H03M1/00;(IPC1-7):H03M7/00 |
主分类号 |
G06F3/05 |
代理机构 |
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代理人 |
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地址 |
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