HONEYWELL 51304437-100
HONEYWELL 51304437-100
梯形圖必須符合順序執(zhí)行的原則 梯形圖應(yīng)符合從左到右、從上到下地執(zhí)行,如不符合順序執(zhí)行的電路不能互接編程,圖7.29a)所示的橋式電路就不能直接編程。
對(duì)于確實(shí)需要橋式電路的地方,可按其邏輯關(guān)系等效成非橋式電路,如圖7.29b)、c)所示。 |
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5.編程技巧
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使用安全PLC/DCS 及安全網(wǎng)絡(luò)的優(yōu)點(diǎn)包括: 1)把串聯(lián)觸點(diǎn)多的電路塊編在梯形圖上方可減少指令數(shù),圖7.30中,a)比b)少了指令ORLD。
2)把并聯(lián)觸點(diǎn)多的電路塊放在梯形圖左方,可縮短程序。圖7.31中,b)比a)少了指令A(yù)NDLD。
3)并聯(lián)線圈電路,從分支點(diǎn)到線圈之間無(wú)觸點(diǎn),則線圈應(yīng)放在上方,例如圖7.32b)節(jié)省了主控指令,這就縮短了編程、節(jié)省了存儲(chǔ)空間。
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