Universal program input circuit

A program input, general-purpose technology, applied in signal transmission systems, electrical signal transmission systems, instruments, etc., can solve the inconvenience of using, short circuit or open circuit jumper J1 and J2, and the inability to freely select temperature sensor or program input Signal and other issues

Inactive Publication Date: 2008-07-16
DELTA ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, with the current commonly used technology, it is not convenient to short or open the jumpers J1 and J2. It is not necessary to disassemble the machine shell to deal with the short and open solder joints of the jumpers J1 and J2, or to design an additional mechanism switch. To short or open the contacts of jumpers J1 and J2
[0008] To sum up, since the program input terminal is often restricted when using temperature or process controllers, it is impossible to freely select the temperature sensor or program input signal
Even if you can choose, you often need to disassemble the machine casing to short-circuit, open-circuit solder joints or jumpers, or toggle the mechanism switch to select different program inputs, which is very inconvenient to use

Method used

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Embodiment Construction

[0035] Relevant technical contents and detailed description of the present invention are as follows in conjunction with accompanying drawing now:

[0036] Fig. 2 is a circuit diagram of a controller of an embodiment of the present invention. In this embodiment, the controller 200 includes an input interface 202 and an amplifier circuit 204 , both of which receive an operating voltage 218 . The input interface 202 includes a multitasking processor U2, a signal attenuation circuit 206, a grounding circuit 208, resistors R1, R4, and capacitors C3, C4. The amplifier circuit 204 includes an amplifier OPA, resistors R5, R6, R7, and capacitors C1, C2, C5, C6, C7.

[0037] The multi-tasking processor U2 has a plurality of channels, and receives the selection signal A (212), the selection signal B (210), the platinum resistance signal RTD and the cold junction compensation signal COLD JNC. Wherein, the multitasking processor U2 may be a dual-channel multitasking processor, and has tw...

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Abstract

The invention relates to a universal program input circuit that includes at least one control signal, plural multitasking processor, signal decaying circuit and earth circuit. The signal decaying circuit connects to multitasking processor and receiving program input signal, and determining whether to take decaying to program input signal. The earth circuit connects to multitasking processor and receives earth signal, and determines whether to take earth connecting to one of the channel.

Description

technical field [0001] The invention relates to a general-purpose program input circuit, in particular to a general-purpose program input circuit in a temperature or process controller which can process program inputs of different signal levels without changing packaged hardware. Background technique [0002] For instruments and equipment such as temperature or process controllers, it must have a signal that can be used to input signals from thermocouples (Thermocouple), platinum resistance (RTD), and millivolt (mV), milliampere (mA), volt ( A general-purpose program input circuit for Volt)-level signals. Such a general-purpose program input circuit is generally composed of some attenuation and matching resistors, filter capacitors and a single-channel multi-tasking processor, and then filtered and amplified by an operational amplifier circuit. . [0003] Figure 1 is a circuit diagram of a conventional controller. The controller 100 includes an input interface 102 and an ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G08C19/32G08C19/30
Inventor傅昌贵
OwnerDELTA ELECTRONICS INC