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梯形圖是PLC控制系統中使用得最多的圖形編程語言，被稱為PLC的第一編程語言。梯形圖與電器控制系統的電路圖很相似，具有直觀易懂的優點，很容易被工廠電氣人員掌握，特別適用于開關量邏輯控制。梯形圖常被稱為電路或程序，梯形圖的設計稱為編程。PLC梯形圖設計規則（或規范）如下： (1)觸點應畫在水平線上，不能畫在垂直分支上。應根據自左至右、自上而下的原則和對輸出線圈的幾種可能控制路徑來畫。 (2)不包含觸點的分支應放在垂直方向，不可放在水平位置，以便于識別觸點的組合和對輸出線圈的控制路徑。 (3)在有幾個串聯回路相并聯時，應將觸頭多的那個串聯回路放在梯形圖的最上面。在有幾個并聯回路相串聯時，應將觸點最多的并聯回路放在梯形圖的最左面。這種安排，所編制的程序簡潔明了，語句較少。 (3)不能將觸點畫在線圈的右邊，只能在觸點的右邊接線圈。 |
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TT-2952-3058-C INLMOTDC SERVO MOTOR
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A61614 THOMSON BALL BUSHING
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41320+ BRAD HARRISON CONNECTCORD
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