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模拟量信号连接应注意的问题变频器中的模拟量输入信号,通常指0~10V/5V 的电压信号或0/4~20 mA的电流信号;这些模拟量输入信号可通过接线端子由外部给定,当变频器与P L C 连接时,这些模拟量输入信号也可来自PLC 的模拟量输出信号,如图3 所示。在进行模拟量的连接时应注意:
(1)阻抗匹配。根据变频器的输入阻抗选择P L C 的输出模块,实现两者的阻抗匹配。
(2)电压范围。当变频器和P L C 的电压信号范围不同时(如变频器的输入信号为0~10V,而PLC 的输出电压信号范围为0~5V 时;或PLC 的一侧的输出信号电压范围为0~10V而变频器的输入电压信号范围为0~5V时),需采用串联电阻的方式进行分压,以保证两者在正常电压范围内
工作,避免电压过限可能损坏器件。
(3)采用屏蔽电缆或绞合电缆。对于变频器和P L C 而言,弱电控制信号(电压0~5V/10V、电流0/4~20mA等)易受到外界强信号的干扰,对控制信号采取适当的屏蔽措施。常用的方式就是采用屏蔽电缆进行屏蔽;对于长距离的控制回路宜采用绞合电缆,绞合电缆的绞合间距尽可能小。
(4)主、控电缆分开布线。实际连线时,注意主、控电缆分开布线,且相隔的距离。以保证主电路侧的干扰及噪音影响不到控制电路。
6ES7 521-1BL10-0AA0 1
6GK7242-5DX30-0XE0 1------------
6ES7 531-5HF00-0AB0 2
6GK5004-1GM10-1AB2 1 ------------
6GK1500-0FC10 4---------------
6EP3332-6SB00-0AY0 1
6SN1162-0BA03-0AA1 1------------
6ED1052-1FB08-0BA1
IC200MDL640K 2
IC694MDL741 1
IC694MDL732B 1
6ES7307-1EA01-0AA0 2
6ES7505-0KA00-0AB0 4
7MH4960-2AA01 4
6ES7215-1AG40-0XB0 2
6ES7214-1BG40-0XB0 2
6ES7313-5BG04-9AM0 1台
ATV660C63Q4X1 数量2
545-5DA00-0AB0 1
6ES7138-4FC01-0AB0 1
B&W ASI模拟输入模块FUL2101 K034 BW1345 0900160366
B&W ASI模拟输出模块BW1412 0900160365
AA141-H00 2
BCF5-S18-AP4X 10
1734OB8 面价1055 数量15
1734-IR2 面价2531 数量2
6AV6 648-0CE11-3AX0 2----------
6GK7 443-1EX11-0XE0 1-----------
MBDDT2210 1
6ES7 331-1KF01-0AB0 1
6SL3352-1AE38-4CA1 1
6GK1 500-0DA00 1
231-7PD22-0XA8 1
6EP1334-3BA00 4
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