IC670ALG310 積算定時(shí)器
100ms積算定時(shí)器T250~T255的定時(shí)范圍為0.1~3276.7s。X1的常開(kāi)觸點(diǎn)接通時(shí)(見(jiàn)圖3–12),T250的當(dāng)前值計(jì)數(shù)器對(duì)100ms時(shí)鐘脈沖進(jìn)行累加計(jì)數(shù)。X1的常開(kāi)觸點(diǎn)斷開(kāi)或停電時(shí)停止定時(shí),當(dāng)前值保持不變。X1的常開(kāi)觸點(diǎn)再次接通或重新上電時(shí)繼續(xù)定時(shí),累計(jì)時(shí)間(t1+t2)為1055×100ms=105.5s時(shí),T250的觸點(diǎn)動(dòng)作。因?yàn)榉e算定時(shí)器的線圈斷電時(shí)不會(huì)復(fù)位,需要用X2的常開(kāi)觸點(diǎn)使T250強(qiáng)制復(fù)位。
3.IC670ALG310 使用定時(shí)器的注意事項(xiàng)
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(shí)修改定時(shí)器的當(dāng)前值。當(dāng)定時(shí)器的當(dāng)前值等于設(shè)定值時(shí),其輸出觸點(diǎn)在執(zhí)行定時(shí)器線圈指令或END指令時(shí)動(dòng)作。如果不是使用上述的定時(shí)器,在特殊情況下,定時(shí)器的工作可能不正常。 如果1ms定時(shí)器用于中斷程序和子程序,在它的當(dāng)前值達(dá)到設(shè)定值后,其觸點(diǎn)在執(zhí)行該定時(shí)器的*條線圈指令時(shí)動(dòng)作。
4.IC670ALG310定時(shí)器的定時(shí)精度
IC670ALG310定時(shí)器的精度與程序的安排有關(guān),如果定時(shí)器的觸點(diǎn)在線圈之前,精度將會(huì)降低。平均誤差約為1.5倍掃描周期。zui小定時(shí)誤差為輸入濾波器時(shí)間減去定時(shí)器的分辨率,1ms,10ms和100ms定時(shí)器的分辨率分別為1ms,10ms和100ms。
如果定時(shí)器的觸點(diǎn)在線圈之后,zui大定時(shí)誤差為2倍掃描周期加上輸入濾波器時(shí)間。如果定時(shí)器的觸點(diǎn)在線圈之前,zui大定時(shí)誤差為3倍掃描周期加上輸入濾波器時(shí)間。
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