1760-L18DWD-EX
1760-L18DWD-EX
1760-L18DWD-EX
（ 1 ）对输入 / 输出点的选择
盲目选择点数多的机型会造成一定浪费。
要先弄清除控制系统的 I/O 总点数，再按实际所需总点数的 15 ～ 20 ％留出备用量（为系统的改造等留有余地）后确定所需 PLC 的点数。
另外要注意，一些高密度输入点的模块对同时接通的输入点数有限制，一般同时接通的输入点不得超过总输入点的 60 ％； PLC 每个输出点的驱动能力（ A/ 点）也是有限的，有的 PLC 其每点输出电流的大小还随所加负载电压的不同而异；一般 PLC 的允许输出电流随环境温度的升高而有所降低等。在选型时要考虑这些问题。
PLC 的输出点可分为共点式、分组式和隔离式几种接法。隔离式的各组输出点之间可以采用不同的电压种类和电压等级，但这种 PLC 平均每点的价格较高。如果输出信号之间不需要隔离，则应选择前两种输出方式的 PLC 。
◆ 企业名称：厦门泰尼电气有限公司
◆ 主营业务：DCS,PLC
◆ 经营模式： 贸易
◆ 贸易地区： ***
◆ 联系人： 小黄《女士》
◆ 电话：0592-6809319
◆手机：18950191386
◆ ***:2917675397
◆ 传真：0592-6890859 （备注“01006”收）
◆ E-mail： 2917675397@***.com
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