近幾年，信集閉系統的控制聯鎖方式趨向多樣化，除繼電器聯鎖控制方式外，有設計采用微機聯鎖控制、可編程序控制器（PLC）聯鎖控制、可編程邏輯器件（PLD）聯鎖控制等方式。本文介紹我們用OMRON公司SRM1可編程序控制器（PLC）做井下信集閉系統的主要控制器并與其它I/O模塊構成基于CompoBUS/S現場總線的遠程控制網，實現機車運行和系統設備的集中控制、聯鎖和模擬盤實時運行監視、自動/人工車輛調度，從而保證井下機車運輸，提高運輸效率，減輕勞動強度，降低能源消耗。該系統運行穩定、現場抗干擾性強、具有連結方便、系統易于擴展等特點。　圖一為某礦井底環形車場平面布置圖。車場東西兩翼2.5Km，各翼分別布置有一條重車道和輕車道，向北0.4Km 和0.9Km分別至副井罐籠和主井翻車籠。圖中詳盡地標明了車場結構、區段劃分和電動道岔、彈簧道岔、人工道岔、色信號燈等設備的布置情況。根據該礦生產實際，列車或機車在此車場內共有十種作業：1）、將西翼發來的煤車（重車）調到主井后，機車返回區段8待命；2）、將西翼發來的矸石車或其它車輛調到副井，機車返回區段8待命；3）將東翼發來的煤車調到主井后，機車返回區段8待命；4）將東翼發來的矸石車或其它車輛調到副井，機車返回區段8待命；5）機車由區段8調往主井；6）機車由區段8調往副井；7）將主井空車（輕車）發往西翼；8）將主井空車發往東翼；9）將副井空車或材料車等發往西翼；10）將副井空車或材料車等發往東翼。此10種作業又可按完成作業時所經車場區段劃分為14條進路，其用一個運行區段或一組道岔的兩個進路則互為敵對進路。為防止機車發生碰頭、側撞、追尾等事故，互為敵對進路不允許同時開放并進行電氣閉鎖，所以全車場共設八臺色燈信號機、五臺電動轉轍機對進路或有關區段進行防護，各進路聯鎖如下表所示。 系統設計3．1 硬件設計　　整個系統采用OMRON公司CompoBUS/S控制系統構成進路式分布控制方式，根據系統電動轉轍機、手動道岔、信號機、區段數、模擬盤上顯示光帶數等計算出系統I/O點數，確定遠程I/O模塊個數及分布。控制主機采用SRM1-C02型PLC，它多可以構成一個多達32個從站、擁有256個I/O點的分散I/O控制系統，并通過SRM1-C02的RS-232C端口連接一臺上位機作監控、管理、編程。從站根據需要選配遠程繼電器輸出端子SRT1-R0F08和遠程晶體管輸入端子SRT1-RD08，電纜采用型號為VCTF-JISC3306的乙烯基屏蔽電纜，網絡終端阻抗器為SRS1-T，電源采用OMRON的S82S-0724電源箱。 圖二為該系統硬件組成框圖。3．2 軟件設計　　本系統可編程序控制器控制程序采用模塊化結構設計，根據信集閉系統控制功能的不同，將程序分為八個模塊分別編程和調試，后進行綜合調試，控制程序流程如圖三。主要有調度模擬盤狀態監測程序，用來監測模擬盤機車行駛區段光帶顯示狀態，為調度員提供井下機車實時行駛位置；電動道岔控制及狀態監控程序，根據系統聯鎖控制邏輯對電動轉轍機進行控制，同時監測所有電動道岔當前位置狀態和執行情況，為保證電動道岔工作正常，在程序中設置動作反應監測功能，若發生道岔夾矸或擠岔故障，自動發出聲光報警；進路監測控制程序，專門對系統14條進路監測與監控，根據作業種類對有關的電動道岔和敵對進路的信號實行閉鎖，非敵對進路和其他電動道岔進行解鎖。機車闖紅燈報警程序，是由機車當前位置與所占進路閉鎖狀態、該進路信號燈狀態進行邏輯判斷識別，發現闖紅燈機車立即進行聲光報警，并對有關進路及時進行閉鎖，防止機車碰頭、側撞、追尾事故的發生。為提高系統程序的可靠性和抗干擾性，在編程中還多處設置“看門狗"定時器，增強程序的自診斷能力。本程序設置有人工和自動兩種控制方式，正常情況下采用自動控制方式，減輕工作人員勞動強度。井下特殊情況時，可由自動方式轉換為人工調度狀態以滿足井下運輸要求。　　本系統編程采用基于Windows平臺的SYSMAC-CPT編程軟件，它適用于OMRON大、中、小型PLC的用戶程序編制和監控。其功能1）脫機編程：可用梯形圖語言或指令編程，可實現多窗口、多工程、多任務運行，還可發揮剪切板的功能，方便地實現程序的剪切、復制、粘貼等編程功能。編程之后可進行語法檢查，幫助糾正程序語法錯誤。2）監控運行：PLC通過RS232-C接口與上位機相連，計算機可監視PLC的工作；可觀察任何工作位的狀態；Threshold and zero-frequency return difference can avoid the frequency converter running at low speed in the low frequency output pump (the efficiency of the pump is very low when the output of the frequency converter is below 15 HZ) , and make the frequency converter automatically stop the output when it is below a certain frequency, that does not affect the constant pressure water supply requirements, but also to the highest efficiency. PLC control system this system adopts Mitsubishi fx-1s30, i/o points is 30, relay output, PLC programming adopts fx 20p Foshan E hand-held programmer or Mitsubishi PLC special programming software SWOPC FX/WIN FO C, pLC programmable logic controller and software provide a complete programming environment for off-line programming, on-line connection and debugging. In order to improve the performance-to-price ratio of the whole system, the system uses the switching input and output of the programmable controller to control the starting and stopping of the motor, the automatic input, the periodic switching, the frequency conversion of the water supply pump and the alarm of faults, etc. , the motor speed, set pressure, frequency, current, voltage and other analog signals and actual operating parameters are displayed and controlled by the inverter and its built-in PID. The programming instruction of Mitsubishi Plc is simple and easy to understand, and the program design is flexible. The main program of the PLC of this system can be programmed with STL instruction and the State Relay S, Stl instruction, which is very close to the production flow and the sequence diagram, each step in the sequence function diagram is completely separated from the other steps, according to the control requirements of these procedures in a certain order together, you can successfully complete the control task. The state relay of FX series PLC is usually used together with STL instruction when compiling sequence control program. The schematic diagram of pump group switching is shown in figure 3. The working conditions are satisfied. When the 1 # pump is started with frequency conversion, the pump speed will gradually increase with the increase of the output frequency of the transducer. For example, when the frequency of the transducer reaches 50HZ, the water pressure has not yet reached the set value, frequency converter detected the upper limit of frequency and output a switch signal to PLC, after a period of time delay, 1 # pump quickly switch to the power frequency operation, at the same time to cancel the running signal of frequency converter, frequency converter to reduce to 0HZ, then 2 # pump frequency conversion start, if the pressure is not reached, then 2 # pump switch to power frequency, 3 # pump frequency conversion