3、外部DC24V电源 若输入回路有 DC24V供电的接近开关、光电开关等，而PLC上DC24V电源容量不够时，要从外部提供DC24V电源；但该电源的“—”端不要与 PLC的 DC24V的“—”端以及“COM”端相连，否则会影响PLC的运行。

4、输入的灵敏度各厂家对PLC的输人端电压和电流都有规定，如日本三菱公司F7n系列PLC的输入值为：DC24V、7mA，启动电流为4．5mA，关 断电流小于1．5mA，因此，当输入回路串有二极管或电阻（不能完全启动），或者有并联电阻或有漏电流时（不能完全切断），就会有误动作，灵敏度下降，对 此应采取措施。另一方面，当输入器件的输入电流大于PLC的最大输入电流时，也会引起误动作，应采用弱电流的输入器件，并且选用输人为共漏型输入的 PLC，Bp输入元件的公共点电位相对为负，电流是流出 PLC的输入端。

备货，备货，降降降，火火火，火火火……
————————————————————————————————
公司名称：厦门泰尼电气有限公司
联系人：小黄（销售代表）
联系电话：0592-6809319
传真号码：0592-6890859（麻烦备注01006收）
手机：189-5019-1386微信同号
QQ号码:2917675397
地址：厦门市海沧区海沧农场海农北里17号
诚信经营，质量为首，诚信至上，泰尼电气小黄竭诚为您服务！！！
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