M375938 五、新型說明： 【新型所屬之技術領域】 本創作是有關於一種安全系統，特別是有關於一種具有迴路 失效檢知之安全系統。 、 【先前技術】 目前，安全系統内的電路，請參閱第i_a圖及第丨七圖。第 l-a圖為一般正常狀態下，感知器11〇内的節點切換單元IK保持 在第一狀態，以連接第一節點m與第二節點112，而當有入侵者 入侵安全系統時’請參閱第丨七圖，感知器11〇内的節點切換^元 114則轉為開路的第二狀態，此時主機模组1〇1因偵測到終端電阻 102變為開路無限大，而發出警報訊號。但目前的安全系統電路有 -問題’例域人者可沿纽1G3 _娜方式破魏路，使主 機模組101無法偵測到因節點切換單元114狀態的變化 終端電阻102。 此外M375938 V. New Description: [New Technology Field] This creation is about a safety system, especially for a safety system with loop failure detection. [Prior Art] At present, please refer to the i_a diagram and the seventh diagram for the circuits in the safety system. In the normal state, the node switching unit IK in the sensor 11 is kept in the first state to connect the first node m and the second node 112, and when an intruder invades the security system, please refer to In the seventh diagram, the node switching element 114 in the sensor 11 is turned into the second state of the open circuit. At this time, the host module 101 detects an endless circuit due to the detection that the terminating resistor 102 becomes infinitely large. However, the current security system circuit has a problem - the case where the person can break the Wei road along the New 1G3_Na mode, so that the host module 101 cannot detect the change of the state resistance 102 due to the state of the node switching unit 114. In addition
斜錄 安全纽财—問戦如安㈣、時間沒有 ί ^ ’此狀況可能是沒有入侵者侵入’亦有可能為感知 益年久失修而故障，使節點切換單元114無法正常由第一狀 Π第^態’ ^安全_電路遭人為破壞，餘機模組 全疑慮的^到有侵入者入侵。但目前的安全系統無有效解決此保 【新型内容】 有鑑於上述習知技藝之問題，本創作之目的就是在提供一種 3 女=系統’以解決安全魏電路被破壞而使安全 4的問題’ Μ安全系統的主機模 二二: =路失效時間都無發出警報時，可通知==查;吏 全系統 根據摘叙其卜目的，提出—齡全祕 =二，電阻、—主顧組。其中，感知器更包含一第4 ’、、 一郎點、一第二節點及一節點切換單元。節點切拖置_ :具5-第-狀態及-第二狀態，當節點切換單元為第一狀: 夂即單元係連接第一節點與第二節點，當節點切換單元 電阻連接d賴第三節點。主鑛組 — 點，其中當節點切換單福第二狀態時，主機模組係產 訊號。 3^ ”根據本創作之另-目的，提出—種安全纽，其包含一感知 器、-終端電阻、-主機模組。感知器係具有一第一狀態及一第 二狀態。終端電阻連接感知器。主機模組連接感知器，並設定一 祕失效時間，其巾，當大於或等於迴路失效時間，且感知器都 沒有成為第二狀態時，則主機模組產生—迴路失效訊號。 。根據本創作之再-目的，提出—種安全系統，其包含一感知 器、-終端電阻、-主機模ί感知器係具有—第—狀態及一第 ，狀態。終端電阻連接感知H ’以產生—終端電阻值。主機模組 係設定-職餘值，並触與預設電阻輯狀—電壓訊號， 使終端電阻根據賴訊號，以產生終端電阻值。其中，主機模电 侧終端電阻值，當感知H為第二狀態時，主機模組係產生一警 4 M375938 « •報訊號’當感知ϋ為第—狀態，且終端電阻值不等於預設電阻值 時，則主機模組產生警報訊號。 根據本創作之又—目的，提出—種安全系統，其包含：感知 器、終端電阻和主機模組。感知器包含：第—節點、第二節點、 第三節點和節點切換單元。_切換單元具有第—絲 .態’當節點切換單元為第一狀態時，節點切換單元係連接第一節 -點與第二節點，當節換單元為第二狀態時，節點切換單元係 連接該第-節點與該第三節點。終端電阻連接第二節點與第三節 φ 點，以產生終端電阻值。主機模組連接第一節點與第三節點，且 設定迴路失效時間和預設電阻值，並輸出與預設電阻值對應之電 壓訊號，使終端電阻根據電壓訊號，以產生終端電阻值。其中， 當微處理驗時脈產生池進行計數，計數時間大於或等^迴路 失效時間’且節點切換單元都沒有成為該第二狀態時，則主機模 組產生鱗失效職。其巾’當節點切換單元為第二狀態時，則 主機模組係產生警報訊號。其t，主機模組侦測終端電^值，终 •端電阻值不等於預設電阻值時，齡機模組產生警報訊號。其中， • '主機模組偵測終端電阻為開路狀態，則主機模組發出迴路破壞 訊號。其巾，域馳制終端電_祕狀態，社機模組重 置迴路失效時間。 、 承上所述，因依本創作之安全系統，其可具有一或多個下述 優點： ⑴防止安全系統電路被短路，而使安全纽無法正常工作發 出警報。 ⑺當超過迴路失效時間都無發出警報時，可通知保全公司派 5 M375938 員檢查安全系統。 (3)可動態調整終^^電阻’防止被侵入者取得終端電阻值，而 進行安全系統電路破壞。 【實施方式】 以下將參照相關圖式，說明依本創作之安全系統之實施例， 為使便於理解，下述實施例中之相同元件係以相同之符號標示來 說明。 請參閱第2-a圖及第2-b圖，其係為本創作之安全系統之第一 實施例示意圖。圖中，安全系統1包含感知器21〇、終端電阻2〇2 及主機模組201。感知器210包含第一節點211、第二節點212、 第二郎點213以及卽點切換單元214。節點切換單元214可具有第 一狀態及第二狀態。請參閱第2-a圖，當節點切換單元214為第一 狀態時，節點切換單元214可連接第一節點211與第二節點212。 請參閱第2_b圖，當節點切換單元214為第二狀態時，節點切換單 元214可連接第一節點211與第三節點213。 、 終端電阻202連接第二節點212與第三節點213。 主機模組201連接第一節點21 i與第三節點213，當節點切換 單兀214 $第二狀態時’主機模組2〇1可產生警報訊號。在此實 施例’節购鮮元2丨4的第—狀態可為—般的正常狀態，節點 切換早7L214的第二狀態可為遭到入侵的異常狀態。 # f-般正常狀態’主機模、组2〇1發出之侧訊號會依序經過 弟一卽點2U、第二節點212、終端電阻2〇2及第三節點213，而 在遭到入侵的異常狀態，則主機模組2G1發出之制訊號會依序 M375938 213〇^^^201 輸入的横測訊號之電壓降，而得知偵測訊號有無經過終端電阻 202，據此安全糸統可判斷出為正常或異常狀雜。 除此之外’入侵者可能透過破壞電路來進行入侵，例 -位置虛線篇或第二位置麟咖翻舰路的方式破壞電 .路，此_破壞方式由於使侧訊號無法通過終端電阻施，故主 機模組201可照常發出警報。第三位置虛線2〇33處短路 式由於不影響節點切換單元叫的作動，故當安全系統 ζ， 節點切換單元214照樣可轉為第二狀態，而發出警報訊號。 安全系統亦可包含多個感知器，請參閱第k圖，其以3個感 知器為例。各感知器可分別布置在入侵者可能的侵入路線。第一 個感知器2HH的第—節點2111與第三節點則 _的第，2112與第三節點2^連 接第個感知器2101的第二節點2121與第三節點2i3m .二節點2122與第三節點2132可連接第三個感知 “二伙點2123 m3與第三節點2133 ’第三個感知器2103的 一即" /、第二節點2133可連接終端電阻2〇2。Slope recording security New Fortune - asks Ruan Ruan (four), time does not ί ^ 'This situation may be no intruder intrusion' may also be a failure for the perception of prolonged disrepair, so that the node switching unit 114 can not be normal by the first state The ^ state ' ^ security _ circuit was vandalized, and the remaining modules were full of doubts to the intruder invasion. However, the current security system does not effectively solve this protection. [New content] In view of the above-mentioned problems of the prior art, the purpose of this creation is to provide a 3 female = system 'to solve the problem that the security Wei circuit is destroyed and the security 4'主机Safety system host module 22: = When the road failure time is not issued, the alarm can be notified == check; 吏 whole system according to the purpose of the excerpt, proposed - age full secret = two, resistance, - customer group. The sensor further includes a 4', a lang point, a second node, and a node switching unit. The node is cut and dragged _: with 5-state-and-second state, when the node switching unit is first: 夂, that is, the unit is connected to the first node and the second node, and when the node switching unit is connected to the third node, node. Main mine group - point, where the host module produces a signal when the node switches to the second state of the single. 3^ ” According to another purpose of the present invention, a safety button is proposed, which comprises a sensor, a terminating resistor and a host module. The sensor has a first state and a second state. The host module is connected to the sensor and sets a secret failure time. When the towel is greater than or equal to the loop failure time and the sensor does not become the second state, the host module generates a loop failure signal. The re-purpose of the present invention proposes a security system comprising a perceptron, a terminating resistor, a -host mode sensor having a -state and a state, and a terminating resistor connection sensing H' to generate - Terminal resistance value. The host module is set to the duty value, and touches the preset resistor series-voltage signal, so that the terminal resistance is based on the signal, to generate the terminal resistance value, wherein the main mode terminal side resistance value, when When the sensing H is in the second state, the host module generates a warning 4 M375938 « • signal number 'when the sensing state is the first state, and the terminal resistance value is not equal to the preset resistance value, then the host module produces According to the purpose of the present invention, a security system includes: a sensor, a terminating resistor and a host module. The sensor comprises: a node, a second node, a third node and a node switching unit. The switching unit has a first-wire state. When the node switching unit is in the first state, the node switching unit is connected to the first node-point and the second node, and when the switching unit is in the second state, the node switching unit is connected. The first node and the third node are connected to the second node and the third node φ point to generate a terminal resistance value. The host module connects the first node and the third node, and sets a loop failure time and a preset resistance. And outputting a voltage signal corresponding to the preset resistance value, so that the terminal resistance is based on the voltage signal to generate a terminal resistance value, wherein when the micro processing clock generation pool is counted, the counting time is greater than or equal to ^ loop failure time' When the node switching unit does not become the second state, the host module generates a scale invalidation. The towel 'when the node switching unit is in the second state, then the master The module generates an alarm signal. The host module detects the terminal voltage value, and the terminal module generates an alarm signal when the terminal resistance value is not equal to the preset resistance value. When the terminating resistor is in an open state, the host module sends a loop destruction signal. The towel, the domain is in the terminal state, and the social machine module resets the loop failure time. It can have one or more of the following advantages: (1) Prevent the safety system circuit from being short-circuited, and make the safety button not work properly to issue an alarm. (7) When there is no alarm when the loop failure time is exceeded, the security company can be notified to send 5 M375938 members. Check the safety system. (3) Dynamically adjust the final resistance to prevent the intruder from obtaining the terminal resistance value and perform the safety system circuit destruction. [Embodiment] The following describes the safety system according to the creation. For the sake of understanding, the same components in the following embodiments are denoted by the same reference numerals. Please refer to Figures 2-a and 2-b, which are schematic diagrams of the first embodiment of the security system of the present invention. In the figure, the security system 1 includes a sensor 21 〇, a terminating resistor 2 〇 2, and a host module 201. The perceptron 210 includes a first node 211, a second node 212, a second lang point 213, and a defect switching unit 214. The node switching unit 214 can have a first state and a second state. Referring to FIG. 2-a, when the node switching unit 214 is in the first state, the node switching unit 214 can connect the first node 211 and the second node 212. Referring to FIG. 2_b, when the node switching unit 214 is in the second state, the node switching unit 214 can connect the first node 211 and the third node 213. The terminating resistor 202 is connected to the second node 212 and the third node 213. The host module 201 is connected to the first node 21 i and the third node 213. When the node switches the unit 214 $2, the host module 2〇1 can generate an alarm signal. In this embodiment, the first state of purchasing the fresh element 2丨4 may be a normal state, and the second state of the node switching early 7L214 may be an abnormal state of being invaded. # f-normal state 'the host mode, the side signal sent by the group 2〇1 will pass through the second point 2U, the second node 212, the terminating resistor 2〇2 and the third node 213, and is invaded. In the abnormal state, the signal generated by the host module 2G1 will sequentially follow the voltage drop of the horizontal measurement signal input by M375938 213〇^^^201, and it is known whether the detection signal passes through the terminating resistor 202, and accordingly, the security system can judge It is normal or abnormal. In addition, the intruder may invade by destroying the circuit, for example, the position of the dotted line or the second position of the lining of the ship to destroy the electric road. This _ destruction method makes the side signal unable to pass the terminal resistance. Therefore, the host module 201 can issue an alarm as usual. The third position is short-circuited at the line 2〇33. Since the operation of the node switching unit is not affected, when the security system is turned on, the node switching unit 214 can still be turned into the second state to issue an alarm signal. The security system can also contain multiple perceptrons, see Figure k, which uses three sensors as an example. Each sensor can be placed separately in an intruder's possible intrusion route. The first node 2111 of the first perceptron 2HH and the second node 2121 and the third node 2^ of the third node are connected to the second node 2121 and the third node 2i3m of the first perceptron 2101. The two nodes 2122 and the third The node 2132 can connect the third sensing "two gangs 2123 m3 and the third node 2133", that is, one of the third perceptrons 2103, and the second node 2133 can be connected to the terminating resistor 2〇2.
誠全系統並不受限於一個或三個感知器，可以利用 /的效數。第」^推廣至多個感知器。例如Ν個感知器，Ν為大於 Ν個^知感知器的第—節點與第三節點連接域模組，第 個似%第二&轉該第三節闕連絲端雜，其_第M 點與第三節點連接細個感知器的第二節點 滅知器的第；:感知器的第二節點與第三節點連接第m+i 個齡_第-即點與第三節點，M為介於之間的整數。 7 M375938 請參閱第3圖’其係為本創作之安全系狀第二實施例示意 圖。與第2圖的差異在第3圖的主機模組3()1更包含時脈產生模 組3013、預設電阻值選擇模組則及麵組纖。主機模 組301可設定迴路失效時間，並由微控制器依時脈產生模組刪 計數，當大於或等於迴路失效時間，節點切換單元314都保持在 第-狀態’沒有轉為第二狀態，此時安全系統有可能是故障或是 遭到破壞，此時主機模、组301可產生迴路失效訊號，以通知保全 公司派員檢查安全系統有無問題。 預没電阻值選擇模組3011可提供主機模組3〇1動態設定正常 狀態的預&電阻值’之後主赌組3Q1可根據此預設電阻值，選 擇對應預設電阻值的電壓訊號3014,並輸出此電壓訊號3〇14至終 端電阻302，使終端電阻302可根據電壓訊號3〇14產生終端電阻 302值。此可動態調整終端電阻3〇2的方法，可預防入侵者因得知 終端電阻迎值而在第一位置虛線_處接上相同的終端電阻 302，並破壞第一電路點3〇4及第二電路點3〇5進行入侵。 當主機模組301偵測終端電阻3〇2办終端電阻偵測值不等於 預設電阻值，則主機模組301可產生警報訊號。 當主機模組301偵測到終端電阻观為開路狀態，則主機模 組301發出迴路破壞訊號。 。而當主機模組301偵測到終端電阻3〇2為短路狀態，表示感 知，310内的節點切換單元314可能被觸發由第一狀態轉為第二 狀態’顯示安全系統功能正常’則主機模I且301可重置迴路失效 時間。 凊參閱第4 ® ’其係為本創作之安全系統檢知方法步驟流程 M375938 圖。圖中’首先，步驟S401由主機模組設定預設電阻值及迴路失 效時間。步驟S402使用主機模組偵測終端電阻產生的終端電阻 值。步驟S403當主機模組偵測的終端電阻值等於預設電阻值，且 大於或等於迴路失效時間，感知器都沒有更改狀態，則主機模組 產生迴路失效訊號。The system is not limited to one or three perceptrons and can take advantage of /. The first "^ is extended to multiple perceptrons. For example, one perceptron, the first node and the third node are connected to the domain module, and the first is the second and the third is connected to the third node. The second node of the second node is connected to the third node; the second node of the perceptron is connected to the third node by the m+i age _ the first point and the third node, M is An integer between. 7 M375938 Please refer to Fig. 3, which is a schematic view of a second embodiment of the security system of the present invention. The difference from Fig. 2 is that the host module 3() 1 of Fig. 3 further includes a clock generation module 3013, a preset resistance value selection module, and a surface group fiber. The host module 301 can set the loop failure time, and the microcontroller switches the count according to the clock generation module. When the loop failure time is greater than or equal to the loop failure time, the node switching unit 314 remains in the first state and does not change to the second state. At this point, the security system may be faulty or damaged. At this time, the host module and group 301 may generate a loop failure signal to notify the security company to send personnel to check whether the security system has a problem. The pre-no resistance value selection module 3011 can provide the pre-amplifier value of the host module 3〇1 dynamically setting the normal state. After the main bet group 3Q1 can select the voltage signal 3014 corresponding to the preset resistance value according to the preset resistance value. And outputting the voltage signal 3〇14 to the terminating resistor 302, so that the terminating resistor 302 can generate the terminating resistor 302 according to the voltage signal 3〇14. The method of dynamically adjusting the terminating resistor 3〇2 can prevent the intruder from connecting the same terminating resistor 302 at the dash line of the first position due to the knowledge of the terminal resistance, and destroying the first circuit point 3〇4 and the first The second circuit point 3〇5 invades. When the host module 301 detects the terminal resistance 3〇2 and the terminal resistance detection value is not equal to the preset resistance value, the host module 301 can generate an alarm signal. When the host module 301 detects that the terminal resistance is open, the host module 301 issues a loop destruction signal. . When the host module 301 detects that the terminating resistor 3〇2 is in a short-circuit state, indicating that the node switching unit 314 in the 310 may be triggered to change from the first state to the second state, the display security system functions normally. I and 301 can reset the loop failure time.凊 Refer to Section 4 ® ''''''''''' In the figure, first, in step S401, the preset resistance value and the loop failure time are set by the host module. Step S402 uses the host module to detect the terminal resistance value generated by the terminating resistor. Step S403: When the terminal resistance value detected by the host module is equal to the preset resistance value, and is greater than or equal to the loop failure time, and the sensor does not change state, the host module generates a loop failure signal.
其中在主機模組偵測到的終端電阻值不等於預設電阻值的前 提下，當主機模組為警戒狀態時，則主機模組可發出警報訊號， 而虽主機模組為非警戒狀態時，此時如主機模組偵測到終端電阻 值為開路狀態’則主機模組發出迴路破壞訊號，而如域模組偵 測終端電阻值為短路狀態，則主機模組重置迴路失效時間。 π>閱第5 ® ’其係為本創作之安全系統檢知方法步驟流程 估Z中安全系關始1作時’可先設定正常範_預設電阻 =5〇2’與=定感知衫久沒動作即發蚊效料的鹏失效時間 • 系統，機檢測終端電阻值504，以判斷終端電阻值 二二制山^又疋值或短路505 °當主機判斷終端電阻值等 失間5〇Γ。^查阻值為預設電阻值)，則接著判斷是否到達迴路 且伴入八卞辰員:贴路失效時間時，發出迴路失效警示507， Μ呆王公司派貝處理511，若 機判斷終端電阻為開路狀㈣否目職測電阻值504。當主 公司派員處理5⑴當後出迴路破壞警示512，且保全 則重置迴路失效時間5〇8，接著判=阻值不為設定值或短路時， 為警戒狀態，則發出安全馨報 X否為警戒狀態509 ’若此時 否，則主機模組繼續檢測終端電阻值且保全公司派員處理511 ’若 以上所述僅為舉例性， 為限制性者。任何未脫離本創作 9 均應包含於後附 之^與’而對其進行之等效修改或變更， 之申凊專利範圍中。 【圖式簡單說明】 S至第Ι-b圖係為先前技術之安全系統之實施例作動示意 Γ^Ι · 圚， 第2-a圖至第2-b圖係為本創作之安全系統之第一實施例節點切 換單元作動示意圖； 第2-c圖係為本創作之三個感知器連接方式之實施例示意圖； 第3圖係為本創作之安全系統之第二實施例示意圖； 第4圖係為本創作之安全系統檢知方法步驟流程圖；以及 第5圖係為本創作之安全系統檢知方法流程圖。 【主要元件符號說明】 101、 201、301 :主機模組； 102、 202、302 :終端電阻； 103 :虛線； 110、 210、310:感知器； 111、 211 :第一節點； 112、 212 :第二節點； 213 :第三節點； 114、214、314 :節點切換單元； 2031、3031 :第一位置虛線； M375938 2032 :第二位置虛線； 2033 :第三位置虛線； 2101 :第一個感知器； 2111 :第一個感知器的第一節點； 2121 :第一個感知器的第二節點； 2131 :第一個感知器的第三節點； 2102 :第二個感知器； 2112 :第二個感知器的第一節點； 2122 :第二個感知器的第二節點； 2132 :第二個感知器的第三節點； 2103 :第三個感知器； 2113 :第三個感知器的第一節點； 2123 ··第三個感知器的第二節點； 2133 :第三個感知器的第三節點； 3011 :預設電阻值選擇模組； 3012 :微控制模組； 3013 :時脈產生模組； 3014 :電壓訊號； 304 :第一電路點； 305 :第二電路點； 502 :設定預設電阻值； 503 :設定迴路失效時間； 504 :偵測終端電阻值； 505 :判斷終端電阻值； 506 :判斷是否到達迴路失效時間； 11 M375938 507 :發出迴路失效警示； 508 :重置迴路失效時間； 509 :判斷是否為警戒中； 510 :發出安全警報； 511 :保全公司派員處理； 512 :發出迴路破壞警示；以及 S401〜S403 :步驟流程。 12In the case that the terminal resistance value detected by the host module is not equal to the preset resistance value, when the host module is in the alert state, the host module can issue an alarm signal, and although the host module is in the non-alert state At this time, if the host module detects that the terminal resistance value is an open state, the host module issues a loop destruction signal, and if the domain module detects that the terminal resistance value is a short circuit state, the host module resets the loop failure time. π>Reading 5 ® 'The system is the safety system detection method step-by-step process of the creation of the safety system. When the safety system is started, 1 can be set first. Normal mode _ preset resistance = 5 〇 2' and = Sense perception shirt The long-term no-action, the mosquito failure effect of the Peng failure time • System, machine detection terminal resistance value 504, in order to judge the terminal resistance value of the two-two system ^ 疋 value or short-circuit 505 ° when the host judges the terminal resistance value and other errors 5〇 Hey. ^Check the resistance value as the preset resistance value), then judge whether it reaches the loop and is accompanied by the occupant: when the affixing failure time, the circuit failure warning 507 is issued, and the 王 wangwang company sends the 511 to handle the benzene. Open circuit (4) No objective test resistance value 504. When the main company dispatches personnel to deal with 5 (1) and then the circuit break warning 512, and the reset circuit resets the circuit failure time 5〇8, and then judges that the resistance value is not the set value or short circuit, it is in the alert state, then the safety newsletter X is issued. No, it is in the alert state 509 'If it is not at this time, the host module continues to detect the terminal resistance value and the security company dispatches the staff to process 511 'If the above description is merely exemplary, it is a restrictive one. Any deviation from this creation 9 shall be included in the scope of the patent application for the equivalent modification or modification of the following. [Simple diagram of the diagram] The S to the Ι-b diagram is an example of the operation of the prior art security system. Ι^Ι · 圚, the 2-a to 2-b diagrams are the security systems of the creation. The first embodiment is a schematic diagram of the operation of the node switching unit; the second picture is a schematic diagram of the embodiment of the three sensor connection modes of the creation; the third figure is a schematic diagram of the second embodiment of the security system of the creation; The diagram is a flow chart of the steps of the security system detection method of the creation; and the fifth diagram is a flow chart of the security system detection method of the creation. [Main component symbol description] 101, 201, 301: host module; 102, 202, 302: terminating resistor; 103: broken line; 110, 210, 310: perceptron; 111, 211: first node; 112, 212: Second node; 213: third node; 114, 214, 314: node switching unit; 2031, 3031: dotted line in the first position; M375938 2032: dotted line in the second position; 2033: dotted line in the third position; 2101: first sensing 2111: the first node of the first perceptron; 2121: the second node of the first perceptron; 2131: the third node of the first perceptron; 2102: the second perceptron; 2112: the second The first node of the perceptron; 2122: the second node of the second perceptron; 2132: the third node of the second perceptron; 2103: the third perceptron; 2113: the first of the third perceptron Node; 2123 ··the second node of the third perceptron; 2133: the third node of the third perceptron; 3011: preset resistance value selection module; 3012: micro control module; 3013: clock generation mode Group; 3014: voltage signal; 304: first circuit point; 305: second circuit point; 502: Set the preset resistance value; 503: set the loop failure time; 504: detect the terminal resistance value; 505: judge the terminal resistance value; 506: judge whether the loop failure time is reached; 11 M375938 507: issue a loop failure warning; 508: reset Loop failure time; 509: judge whether it is alert; 510: issue a security alarm; 511: security company dispatching staff; 512: issue loop destruction warning; and S401~S403: step flow. 12