IC670ALG310 積算定時器
100ms積算定時器T250~T255的定時范圍為0.1~3276.7s。X1的常開觸點接通時(見圖3–12),T250的當前值計數器對100ms時鐘脈沖進行累加計數。X1的常開觸點斷開或停電時停止定時,當前值保持不變。X1的常開觸點再次接通或重新上電時繼續(xù)定時,累計時間(t1+t2)為1055×100ms=105.5s時,T250的觸點動作。因為積算定時器的線圈斷電時不會復位,需要用X2的常開觸點使T250強制復位。
3.IC670ALG310 使用定時器的注意事項
如果在子程序或中斷程序中使用T192~T199和T246~T249,在執(zhí)行END指令時修改定時器的當前值。當定時器的當前值等于設定值時,其輸出觸點在執(zhí)行定時器線圈指令或END指令時動作。如果不是使用上述的定時器,在特殊情況下,定時器的工作可能不正常。 如果1ms定時器用于中斷程序和子程序,在它的當前值達到設定值后,其觸點在執(zhí)行該定時器的*條線圈指令時動作。
4.IC670ALG310定時器的定時精度
IC670ALG310定時器的精度與程序的安排有關,如果定時器的觸點在線圈之前,精度將會降低。平均誤差約為1.5倍掃描周期。zui小定時誤差為輸入濾波器時間減去定時器的分辨率,1ms,10ms和100ms定時器的分辨率分別為1ms,10ms和100ms。
如果定時器的觸點在線圈之后,zui大定時誤差為2倍掃描周期加上輸入濾波器時間。如果定時器的觸點在線圈之前,zui大定時誤差為3倍掃描周期加上輸入濾波器時間。
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