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【GE IS200ISBBG2AAB】
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IS、IC系列,型號齊全,庫存充足,大量現貨
PLC均采用三菱 FX2N系列可編程序控制器。
[例4-1].梯形圖見右圖,助記符指令見下
LD X0 LD X3
AND X1 OUT C05
OUT C04 D30
K30 LD X4
LD X2 OR X5
RST C04 RST C05
LD C04 LD I C05
OUT Y05 OUT Y06
圖4-1 CXX舉例
C04的SV=30。 C05的SV是由D30決定,
可由外部設備設定,實現可調設定值,C04的動作時序見圖4-2
復位輸入(R=X2)
計數輸入(CP=X0,X1)
PV
計數器輸出(C04/Y05)
M8013
X00
[例4-2]
圖4-3(a),實質上是個15sec的定時器。
[ 例4-3]. 點動接收/去抖電路
圖4-4中可保證Y04可靠輸出1sec
[例4-4]. 點動輸出/脈沖輸出
注:圖4-5中,不管輸入時間(X0)是長/短,Y04均給出0.5sec的脈沖輸出。
[例4-5]. 振蕩電路
圖4-6中,在X0 為ON期間,Y05為脈寬可調的振蕩輸出。
[例4-6]. 圖4-7為一種自鎖電路的2種編程方法:
[例4-7].按鈕SB0—SB66控制電機M1—M6 ,控制要求見下表4-1,畫出控制原理圖和控制程序梯形圖 。
表4-1 電機連鎖控制狀態表
電機 按鈕 | M1 M2 M3 M4 M5 M6 |
SB1 | √ √ √ √ √ √ O √ √ √ √ √ O O √ √ √ √ O O O √ √ √ O O O O √ √ O O O O O √ O O O O O O |
SB2 | |
SB3 | |
SB4 | |
SB5 | |
SB6 | |
SB0 |
表中:√表示電機運轉,O表示電機停止
解:由表4-1可看出,輸入信號有7個:
SB1~SB6、SB0,輸出信號有6個電機要控制,分別用6個交流接觸器驅動,I/O信號對應的地址見下:
輸入信號: 按鈕 SB1 SB2 SB3 SB4 SB5 SB6 SB0
地址 X0 X1 X2 X3 X4 X5 X6
輸出信號: 電機 M1 M2 M3 M4 M5 M6
地址 Y0 Y1 Y2 Y3 Y4 Y5
每個輸出點驅動1個交流接觸器,由交流接觸器KM1~KM6驅動電機M1~M6。
PLC接線原理圖見圖4-8。 控制程序梯形圖見圖4-9。
[例4-8].用一個輸出點指示事故、故障報警信號。用間斷的信號表示事故(重要)發生,用連續的信號表示故障(次要)發生。設計程序梯形圖。假設:
采用事故(重要)優先的原則,即在故障報警時如果出現事故信號,將停止故障報警,改為事故報警。
經過設定的時間(1min)后自動停止報警;在該時間內,如果操作人員按了“停止報警”按鈕,將立即停止報警。
I/O信號對應的地址見下:
事故信號 : X00 ; 故障信號: X02 ;
“停止報警”按鈕 : X04 ; 報警器 : Y0 。
梯形圖如圖4-10所示,在事故、故障剛發生時(即圖4-11中X00、X02的上升沿),PLC指令使M105、M106的常開觸點接通一個掃描周期,事故信號、故障信號將分別鎖存在M101和M111中,M101或M111的常開觸點閉合后開始報警,同時定時器T100定時1min,定時時間到時,T100的常閉觸點斷開,使M101或M111線圈“斷電”,停止報警。如果在1min內操作人員按了“停止報警”按鈕,X04的常閉觸點斷開,也將使M101或M111復位,報警器停止報警。T101和T102用來產生接通0.4s、斷開0.8s的信號。若僅出現故障信號,M111的常開觸點和M101的常閉觸點接通,Y0發出故障報警(連續的報警信號)。假設在故障出現期間又發生了事故(見圖4-11),在X00的上升沿,M105的常開觸點、常閉觸點分別接通、斷開一個掃描周期,M105的一個掃描周期,使T100復位,T100將重新開始定時60s,與此同時,M101的常開觸點接通,常閉觸點斷開,Y0的線圈將由一直“通電”變為周期性地間斷“通電”,由故障報警(連續的報警信號)變為事故報警(間斷的報警信號),從而滿足了“事故報警優先”的要求。
GE IS200ISBBG2AAB
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GE