CN203396890U - Disconnection alarm for digital input signals - Google Patents

Disconnection alarm for digital input signals Download PDF

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Publication number
CN203396890U
CN203396890U CN201320503962.XU CN201320503962U CN203396890U CN 203396890 U CN203396890 U CN 203396890U CN 201320503962 U CN201320503962 U CN 201320503962U CN 203396890 U CN203396890 U CN 203396890U
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CN
China
Prior art keywords
digital input
dcs
input signals
plc
resistor
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Active
Application number
CN201320503962.XU
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Chinese (zh)
Inventor
沙明
文敏哲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Northeast Electric Power Design Institute of China Power Engineering Consulting Group
Original Assignee
Northeast Electric Power Design Institute of China Power Engineering Consulting Group
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Application filed by Northeast Electric Power Design Institute of China Power Engineering Consulting Group filed Critical Northeast Electric Power Design Institute of China Power Engineering Consulting Group
Priority to CN201320503962.XU priority Critical patent/CN203396890U/en
Application granted granted Critical
Publication of CN203396890U publication Critical patent/CN203396890U/en
Active legal-status Critical Current
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Abstract

The utility model relates to a disconnection alarm for digital input signals. The alarm comprises a DCS or PLC cabinet, cables or leads, and a digital input switch; and is characterized in that a resistor is connected in parallel with the grounding side of the digital input switch. During normal operation of the alarm, if the digital input signals are normal and contacts are opened, a DCS or PLC can detect relatively low current due to the resistor connected in parallel to the ground, and the digital input signals are represented as 0; and if the digital input signals are normal and the contacts are closed, the DCS or PLC can detect relatively high current even though the resistor is connected to the ground in parallel due to the fact that to close the contacts is equivalent to short the resistor, and the digital input signals are represented as 1. When the cables or leads are disconnected, no matter the digital input signals are in on or off states, the DCS or PLC does not detect current, and the DCS or PLC emit disconnection alarm on a display to notify an operator, so that the operator or maintenance staff can detect the cables or leads, thereby eliminating faults in real time, and avoiding occurrence of serious accidents or economic loss.

Description

Switching value input signal wire break alarm
Technical field
The utility model relates to fuel-burning power plant thermal switch amount input wire break alarm.
Background technology
In thermal power plant, the open and close state of switching value input signal general proxy valve; The startup of motor, halted state; Parameter reaches a certain limit value etc.DCS system or PLC system be according to switching value input signal and other signals, according to logical condition output signal opertaing device or warning in case power plant constantly in safety and economical operation.Switching value input signal is in total IO(input and output of the DCS of thermal power plant system or PLC system) ratio of counting is larger.Whether switching value input signal reliably directly affects safety and the economical operation of thermal power plant.
Common switching value signal is all passive normally opened contact.When DCS system or PLC system are normally moved, may cause contact close signal not to be identified because cable break, cable inside conductor broken string or connection terminal get loose, cause DCS system or the tripping of PLC system and cause major accident or economic loss.
Utility model content
The purpose of this utility model is to provide a kind of instrument of new detector switch amount input signal, improves thermal process automation of fossil power plant level.
For achieving the above object, the utility model provides a kind of switching value input signal wire break alarm, comprises DCS or PLC rack, cable or wire, switching value input switch, it is characterized in that: at a side the connecting resistance on the spot of switching value input switch.
When the utility model normally moves, if switching value input signal is normal, contact disconnects, and due on the spot and the resistance being connected to, DCS/PLC can detect less electric current, and representation switch amount input signal is " 0 "; If switching value input signal is normal, junction closure, although on the spot and the resistance being connected to, because junction closure is equivalent to resistive short, DCS/PLC can detect larger electric current, representation switch amount input signal is " 1 "; When cable or wire breaks, no matter switching value input signal is to disconnect or closure, DCS/PLC will can't detect electric current, DCS/PLC sends break alarm notice substation operator on display, operation and maintainer can check cable or wire, fix a breakdown in time, avoid the generation of major accident or economic loss.
Accompanying drawing explanation
Accompanying drawing 1 is the utility model structural representation.
1-DCS or PLC rack;
2-cable or wire;
3-switching value input switch;
4-resistance.
Embodiment
With reference to accompanying drawing 1, at a side on the spot the connecting resistance 4 of switching value input switch 3.When the software configuration of DCS or PLC rack 1, to and the resistance switch amount input signal that connects break alarm function is set.When the cable or wire 2 of a certain switching value input signal breaks, on DCS HuoPLC host computer operator station picture, can send warning, remind operation and maintainer to check cable or wire, fix a breakdown in time.
As to adopt the utility model, financial cost be low-down.The price of each resistance only has several units, adds 50 yuan only of erected costs.1 the 600MW fired power generating unit of take is example; total IO approximately 6000 points of counting; wherein switching value input is about 2300 points; if all adopt the utility model; 11.5 ten thousand yuan only of overall costs, and because cable or wire broken string causes DCS or PLC tripping, and then the thermal power plant's accident causing or shutdown loss will be over hundreds thousand of so that more than 1,000,000; so the utility model has improved security and the economy of power plant, is applied and promotes in big-and-middle-sized thermal power plant.

Claims (1)

1. a switching value input signal wire break alarm, comprises DCS or PLC rack, cable or wire, switching value input switch, it is characterized in that: at a side the connecting resistance on the spot of switching value input switch.
CN201320503962.XU 2013-08-19 2013-08-19 Disconnection alarm for digital input signals Active CN203396890U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320503962.XU CN203396890U (en) 2013-08-19 2013-08-19 Disconnection alarm for digital input signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320503962.XU CN203396890U (en) 2013-08-19 2013-08-19 Disconnection alarm for digital input signals

Publications (1)

Publication Number Publication Date
CN203396890U true CN203396890U (en) 2014-01-15

Family

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Family Applications (1)

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CN201320503962.XU Active CN203396890U (en) 2013-08-19 2013-08-19 Disconnection alarm for digital input signals

Country Status (1)

Country Link
CN (1) CN203396890U (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103913668A (en) * 2014-03-21 2014-07-09 东风商用车有限公司 Circuit for processing and diagnosis of AD signals or switching signals
CN104316818A (en) * 2014-10-29 2015-01-28 青岛鸿瑞电力工程咨询有限公司 Circuit and method for detecting disconnection of cable online
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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103913668A (en) * 2014-03-21 2014-07-09 东风商用车有限公司 Circuit for processing and diagnosis of AD signals or switching signals
CN103913668B (en) * 2014-03-21 2016-08-17 东风商用车有限公司 A kind of AD signal or the process of switching signal and diagnostic circuit thereof
CN104316818A (en) * 2014-10-29 2015-01-28 青岛鸿瑞电力工程咨询有限公司 Circuit and method for detecting disconnection of cable online
CN104316818B (en) * 2014-10-29 2017-06-16 青岛鸿瑞电力工程咨询有限公司 Cable break online test 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

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Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
C56 Change in the name or address of the patentee

Owner name: CHINA POWER ENGINEERING CONSULTING GROUP NORTHEAST

Free format text: FORMER NAME: NORTHEASTERN ELECTRIC POWER DESIGN INSTITUTE, CHINA POWER ENGINEERING CONSULTING GROUPCORPORATION

CP03 Change of name, title or address

Address after: 130021 Jilin City, Changchun province people's street, No. 4368

Patentee after: Co., Ltd of Northeastern Electric Power Design Institute, China Power Engineering Consulting Group Corporation

Address before: 130021 Northeast Power Design Institute, No. 4368 Renmin Street, Jilin, Changchun

Patentee before: Northeastern Electric Power Design Institute, China Power Engineering Consulting Group Corporation