Detection device for switching value signal quality

Abstract

The utility model discloses a detection device for switching value signal quality. The detection device comprises a monitoring computer, a switch, a PLC processor, a switching value input board card, a switching value signal acquisition line and a switching value signal device. The switching value signal equipment is connected with a switching value input board card on the PLC processor through a switching value signal acquisition line, the PLC processor is connected with the switch through a twisted pair signal, and the switch is connected with the monitoring computer through a twisted pair signal; the PLC processor is used for detecting and analyzing the collected switching value signals, and the monitoring computer is used for displaying the fault state and giving an alarm. The detection device and method are simple and effective, and can be used for state detection of signal quality of other switching value electrical equipment, such as a travel switch, a proximity switch, a contactor and the like, capable of simultaneously outputting an on state signal and an off state signal.

Description

Technical Field

[0001] The utility model belongs to the technical field of automatic instrument measurement and control, mainly aims at state detection of switch quantity signal quality of control system, and relates to a detection device for switch quantity signal quality. Background Art

[0002] Switching signal is a switch signal that the control system collects and detects the operating status and position of production equipment and devices. It is widely used in the detection of equipment position and operating status in various industrial sites to achieve safety interlocking of production processes, equipment and personnel, and plays a vital role in equipment and personal safety interlocking. Whether its signal status is effective and reliable directly determines whether the equipment and safety interlock protection are reliable. Therefore, it is extremely important to monitor the status of the switch signal quality that is extremely important for equipment and safety interlocking.

[0003] Usually, the status inspection of the switch quantity signal quality generally includes "visual inspection" and special instruments, functional testing, etc. "Visual inspection" can only inspect the appearance and wiring of the switch quantity equipment (line), and the real-time and timely performance is not high; special instruments and functional testing cannot perform real-time online inspection, and on the other hand, it also increases the workload of maintenance personnel. For some places with narrow installation locations and high safety risks, it will also increase the operating safety risks of maintenance personnel; it is also impossible to monitor the sudden failure of the switch quantity equipment (line) and whether the signal loop cable is short-circuited, broken, or virtual. Therefore, the current conventional control method cannot achieve the real-time and timely monitoring of the switch quantity signal quality status. The potential risk of switch quantity signal failure caused by power failure, damage, or signal loop short-circuit, open circuit, virtual connection, etc. cannot be discovered in time, which is easy to cause production interruption, equipment damage, and personal injury accidents. Utility Model Content

[0004] The utility model provides a device for detecting the quality of a switching quantity signal, aiming at detecting the switching quantity signal.

[0005] To this end, the utility model adopts the following technical solutions:

[0006] A device for detecting the quality of a switching quantity signal, comprising a monitoring computer, a switch, a PLC processor, a switching quantity input board, a switching quantity signal acquisition circuit and a switching quantity signal device;

[0007] The switch quantity signal device is connected to the switch quantity input board on the PLC processor through the switch quantity signal acquisition line, the PLC processor is connected to the switch through the twisted pair signal, and the switch is connected to the monitoring computer through the twisted pair signal; the PLC processor is used to detect and analyze the acquired switch quantity signals, and the monitoring computer is used to display fault status and alarm.

[0008] This utility model patent mainly uses the PLC processor to perform logical operations, analysis and judgment on the switch quantity signal connected to the PLC processor, and through real-time online monitoring and operation of the switch quantity signal, it can analyze and judge whether the switch quantity signal is in a normal (reliable) working state. When the switch quantity equipment loses power abnormally, the signal triggers a fault, the signal circuit has a short circuit, a break, or a virtual connection, resulting in abnormal switch quantity signal quality, it can promptly issue an alarm or interlock shutdown information to remind equipment maintenance personnel to promptly check and deal with switch quantity equipment and line defects, thereby effectively avoiding production, equipment and life injury accidents caused by unreliable switch quantity signal quality.

[0009] Interlocking logic relationship: proximity switch ON signal, proximity switch OFF signal. When the proximity switch is in normal state, ON and OFF signals must have and only have one signal output (high level). By programming the lower program in the control system for logical judgment, it can be confirmed that it is in normal working state; when the proximity switch ON and OFF signals output signals at the same time, or do not output signals at the same time, it means that there is a problem with the proximity switch and needs to be checked and processed. If there is no output signal at the same time, it means that the proximity switch is not powered, the signal cable is broken, or the switch itself is faulty; if they output signals at the same time, it means that the proximity switch signal cable is short-circuited or the switch itself is faulty.

[0010] Compared with the prior art, the utility model has the following advantages:

[0011] 1. The current control system only introduces switch signals to directly participate in the control interlocking, and there is no detection procedure to judge the status of the switch signal. When the switch device or signal cable fails, it cannot be discovered in time, resulting in the failure of the interlocking signal, which will cause the equipment to malfunction, stop, or even cause personal injury accidents.

[0012] 2. By compiling a switch signal quality status detection program, abnormal situations such as power failure, failure of switch equipment, short circuit, disconnection, and loose connection of signal lines can be detected in time, reminding relevant personnel to check and handle in time and take effective measures to avoid production, equipment, and safety accidents caused by interlocking signal failure.

[0013] 3. The detection device and method are simple and effective, and can be used for status detection of signal quality of other switching electrical equipment such as travel switches, proximity switches, contactors, etc. that can output both on and off state signals at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the switch quantity detection device of the utility model;

[0015] Figure 2This is a flow chart of switch signal detection of the utility model;

[0016] In the figure: 1—monitoring computer, 2—twisted pair, 3—switch, 4—PLC processor, 5—switch input board, 6—switch signal acquisition circuit, 7—switch signal equipment. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments:

[0018] like Figure 1 and 2 As shown, a device for detecting the quality of a switching quantity signal comprises a monitoring computer 1, a switch 3, a PLC processor 4, a switching quantity input board 5, a switching quantity signal acquisition circuit 6 and a switching quantity signal device 7;

[0019] The switch quantity signal device 7 is connected to the switch quantity input board 5 on the PLC processor 4 through the switch quantity signal acquisition line 6, the PLC processor 4 is connected to the switch 3 through the twisted pair 2 signal, and the switch 3 is connected to the monitoring computer 1 through the twisted pair 2 signal; the PLC processor 4 is used to detect and analyze the acquired switch quantity signals, and the monitoring computer 1 is used to display fault status and alarm.

[0020] The processing steps are as follows:

[0021] Step 1: Perform an XOR logic operation on the ON signal and OFF signal of the collected switch quantity signal device 7. When the ON signal and the OFF signal are the same, it means that the switch quantity signal is abnormal, and an alarm message is output and the interlock safety stop is performed; when the ON signal and the OFF signal are opposite, it means that the switch quantity signal logic is normal, and enter step 2 operation.

[0022] Step 2: Accumulate the number of changes of the switch signal per unit time. When the accumulated value is greater than or equal to the set value n, it means that the switch signal is abnormal, output an alarm message and interlock the safe parking; when the accumulated value is less than the set value n, it means that the switch signal is normal, and enter step 3.

[0023] Step 3: According to the equipment status, the change time of the switch signal is timed. When the change timing time is greater than or equal to the set value t, it means that the switch signal is abnormal, and an alarm message is output and an interlock safety stop is performed; when the change timing time is less than the set value t, it means that the switch signal is normal, and continue to step 1 for cyclic detection operation.

Claims

1. A device for detecting the quality of a switching signal, characterized in that: Including monitoring computers, switches, PLC processors, switch input boards, switch signal acquisition circuits and switch signal equipment; The switch quantity signal device is connected to the switch quantity input board on the PLC processor through the switch quantity signal acquisition line, the PLC processor is connected to the switch through the twisted pair signal, and the switch is connected to the monitoring computer through the twisted pair signal; The PLC processor is used to detect, analyze and collect the switch quantity signals, and the monitoring computer is used to display the fault status and alarm.

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