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 word of N bits. An identification or end indication and the N bits of the digital word 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 N bits of the digital word. 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.
|
申请公布号 |
US5805094(A) |
申请公布日期 |
1998.09.08 |
申请号 |
US19960667386 |
申请日期 |
1996.06.21 |
申请人 |
SENSORPULSE CORP. |
发明人 |
ROACH, KEVIN V.;CALVIN, JAMES G. |
分类号 |
H03M1/12;G06F3/05;H03M5/08;(IPC1-7):H03M1/66 |
主分类号 |
H03M1/12 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|