CN103852680A - Device and method for detecting broken line of switching value signal transmission circuit - Google Patents
Device and method for detecting broken line of switching value signal transmission circuit Download PDFInfo
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- CN103852680A CN103852680A CN201210520837.XA CN201210520837A CN103852680A CN 103852680 A CN103852680 A CN 103852680A CN 201210520837 A CN201210520837 A CN 201210520837A CN 103852680 A CN103852680 A CN 103852680A
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Abstract
The invention relates to a device for detecting a broken line of a switching value signal transmission circuit. The device is used for industrial automatic control and comprises a switching value sensor and an I&C detection cabinet, wherein the switching value sensor comprises a plurality of contacts, and the I&C detection cabinet and the switching value sensor are connected to form a loop. The device further comprises a broken line detection resistor R1 which is in parallel line connection with all the contacts of the switching value sensor. The invention further relates to a method for detecting the broken line of the switching value signal transmission circuit. The method comprises the steps that firstly, values of the broken line detection resistor R1 which is connected with the contacts of the switching value sensor in parallel are collected; secondly, values of an all-in resistor R2 of the loop formed by the switching value sensor and the I&C detection cabinet are collected when the contacts of the switching value sensor are closed, and values of an all-in resistor R3 of the loop are collected when the contacts of the switching value sensor are opened; thirdly, during normal running of an automatic control system, the all-in resistor R3 of the loop is detected, and whether a transmitted signal is a fault signal or not is fed back. By means of the device and method for detecting the broken line of the switching value signal transmission circuit, the reliability of procedure parameter measurement is improved.
Description
Technical field
The present invention relates to nuclear power plant's procedure parameter and measure correlative technology field, be specifically related to a kind of devices and methods therefor of detector switch amount signal circuit broken string.
Background technology
In PWR nuclear power plant, widely apply the sensor of dry contact type switching value, such as water level switch, flow switch, pressure switch and temperature switch etc.In the time that process parameter change exceedes the threshold value of setting, these Boolean value output sensors will change the open and-shut mode of output contact, and outside I & C disposal system obtains the contacts status of sensor by routing inspection circuit.Although the sensor interface of dry contact type switching value is simple, dependable performance, antijamming capability is strong, but, if there is disconnection fault in signal circuit cable, when malfunction is opened with sensor output contact, be the same, therefore, once if there is broken string in transmission line, detect loop all the time in off state, even the closing of contact of Boolean value output sensor, I & C system still can think that the output of Boolean value output sensor is in open mode always, cause erroneous judgement, when serious with regard to entail dangers to power plant safety.Therefore, a kind of simple and reliable switching value signal circuit wire break detection method urgently.
Summary of the invention
There is once the technical matters that will solve of the present invention is to provide a kind of transmission line of avoiding the misjudgment phenomenon that broken string causes, and realize the devices and methods therefor of switching value signal circuit burn out detection.
In order to solve the problems of the technologies described above, technical scheme of the present invention is, a kind of device of detector switch amount signal circuit broken string, for industrial automation control system, comprise the Boolean value output sensor that contains several contacts and detect rack with the I & C that described Boolean value output sensor is connected to form loop, also comprise the burn out detection resistance R 1 being connected with the equal parallel line in each contact of described pass quantity sensor.
Described I & C detects the DC testing circuit that rack comprises 48V, and described R1 is the resistance of 100k Ω.
A method for detector switch amount signal circuit broken string, comprising:
The value of step 1, the collection burn out detection resistance R 1 in parallel with Boolean value output sensor contact;
Wherein, R3=R1+R2;
In the time that the all-in resistance R3 in described loop is less than or equal to resistance R 4, feedback transmission circuit normal signal;
Wherein, R4 > R3.
Described resistance R 4 is 2 times of circuit all-in resistance R3.
The present invention adopts and detects the method for loop resistance, has realized loop detections of whether breaking down simple and reliablely, has improved the reliability of procedure parameter measurement.
Accompanying drawing explanation
Fig. 1 is the device schematic diagram of a kind of detector switch amount of the present invention signal circuit broken string;
In figure: 1-Boolean value output sensor contact, 2-burn out detection resistance R 1,3-Boolean value output sensor, 4-signal-transmitting cable, 5-I & C detects rack.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described further.
As shown in Figure 1, the device of a kind of detector switch amount of the present invention signal circuit broken string, for industrial automation control system, comprise the Boolean value output sensor 3 that contains a contact and detect rack 5 with the I & C that described Boolean value output sensor 3 is connected to form loop by signal-transmitting cable 4, also comprise the burn out detection resistance 2 being in parallel with Boolean value output sensor contact 1, its value is R1.
Described I & C detects the DC testing circuit that rack 5 comprises 48V, and described R1 is the resistance of 100k Ω.
A kind of method that the invention still further relates to detector switch amount signal circuit broken string, comprising:
The value of step 1, the collection burn out detection resistance R 1 in parallel with Boolean value output sensor contact 1;
Wherein, R3=R1+R2;
In the time that the all-in resistance R3 in described loop is less than or equal to resistance R 4, feedback transmission circuit normal signal;
Wherein, R4 > R3.
Described resistance R 4 can be set as 2 times of circuit all-in resistance R3.
Claims (4)
1. the device of a detector switch amount signal circuit broken string, for industrial automation control system, it is characterized in that: comprise the Boolean value output sensor that contains several contacts and detect rack with the I & C that described Boolean value output sensor is connected to form loop, also comprise the burn out detection resistance R 1 being connected with the equal parallel line in each contact of described pass quantity sensor.
2. according to the device of detector switch amount signal circuit broken string claimed in claim 1, it is characterized in that: described I & C detects the DC testing circuit that rack comprises 48V, and described R1 is the resistance of 100k Ω.
3. a method for detector switch amount signal circuit broken string, comprising:
The value of step 1, the collection burn out detection resistance R 1 in parallel with Boolean value output sensor contact;
Step 2, gather in the time of the closing of contact of Boolean value output sensor the value of Boolean value output sensor and the all-in resistance R2 in the loop of I & C detection rack formation, and the all-in resistance R3 in described loop in the time that open the contact of Boolean value output sensor;
Wherein, R3=R1+R2;
Step 3, in the time that described automatic control system is normally moved, detect the all-in resistance R3 in described loop, in the time that the value of R3 is greater than resistance R 4, feedback transmission line broken circuit fault-signal;
In the time that the all-in resistance R3 in described loop is less than or equal to resistance R 4, feedback transmission circuit normal signal;
Wherein, R4 > R3.
4. according to the method for detector switch amount signal circuit claimed in claim 2 broken string, it is characterized in that: described resistance R 4 is circuit all-in resistance R3 2 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210520837.XA CN103852680A (en) | 2012-12-07 | 2012-12-07 | Device and method for detecting broken line of switching value signal transmission circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210520837.XA CN103852680A (en) | 2012-12-07 | 2012-12-07 | Device and method for detecting broken line of switching value signal transmission circuit |
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| CN103852680A true CN103852680A (en) | 2014-06-11 |
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| CN201210520837.XA Pending CN103852680A (en) | 2012-12-07 | 2012-12-07 | Device and method for detecting broken line of switching value signal transmission circuit |
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Cited By (5)
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| CN104898009A (en) * | 2015-03-17 | 2015-09-09 | 杭州鸿雁电器有限公司 | Detection device for connected sensing device and detection method |
| CN105203146A (en) * | 2015-09-23 | 2015-12-30 | 浪潮集团有限公司 | Sensor interconnection device and sensor detection system and method |
| CN106019060A (en) * | 2016-07-12 | 2016-10-12 | 中核控制系统工程有限公司 | On-off input signal disconnection detection method |
| CN108110831A (en) * | 2017-12-25 | 2018-06-01 | 深圳市易路网科技有限公司 | A kind of charging wire fault detection method for being used to share charger baby |
| CN111771130A (en) * | 2018-09-26 | 2020-10-13 | 日立建机株式会社 | Safety switch input diagnosis device and working machine using same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104898009A (en) * | 2015-03-17 | 2015-09-09 | 杭州鸿雁电器有限公司 | Detection device for connected sensing device and detection method |
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| CN111771130A (en) * | 2018-09-26 | 2020-10-13 | 日立建机株式会社 | Safety switch input diagnosis device and working machine using same |
| CN111771130B (en) * | 2018-09-26 | 2023-05-02 | 日立建机株式会社 | Safety switch input diagnostic device and work machine |
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Application publication date: 20140611 |
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