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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