HIMA-F8627 中央处理器模块

HIMA-F8627  中央处理器模块

谈到 PLC向外部设备、仪表发送信号，有一种情况经常遇到:要求PLC的输出即能给显示仪表，又能传送给变频器一类的设备。欲彻底解决干扰问题，推荐使用隔离式信号分配器。这种隔离器即实现 PLC输出信号与外设隔离，同时实现外设之间隔离。有时现场仪表在配套时，由于协调不利，产生了如下情况，接收信号设备(例如接收 420mA)接口连接为两线制方式也即接收口为一个24V 电源与一个250Q相串联接口两根线:一个为24V正极，一个为250Q一端，适于连接现场两线制变送器。假如现场设备为四线制变送器，输出4-20mA。这样进行直接连接将造成电源冲突。解决方法是采用隔离器将现场来的4-20mA接收并隔离，在隔离器的输出部份接入一个标准的两线制变送器，以应对接收设备的接口。

HIMA-F8627  中央处理器模块

When it comes to PLC sending signals to external equipment and instruments, there is a situation that is often encountered: the output of PLC is required to be sent to both display instruments and devices such as frequency converters. To completely solve the interference problem, it is recommended to use an isolated signal distributor. This kind of isolator not only realizes the isolation of PLC output signal from peripherals, but also realizes the isolation between peripherals. Sometimes, when the field instruments are matched, due to poor coordination, the following situations occur: the interface of the signal receiving equipment (for example, receiving 420mA) is connected in two-wire mode, that is, the receiving port is connected with two wires of a 24V power supply and a 250Q serial interface: one is a 24V positive electrode and the other is a 250Q end, which is suitable for connecting the field two-wire transmitter. If the field equipment is a four-wire transmitter, the output is 4-20mA. Direct connection in this way will cause power conflict. The solution is to use an isolator to receive and isolate the 4-20mA from the site, and connect a standard two-wire transmitter to the output part of the isolator to cope with the interface of the receiving equipment.

HIMA-F8627  中央处理器模块