DSDX451
通信插座
确保外部绝缘装置中的24 V馈线未连接到其中一个通信插座非常重要。如果它对24 V馈电没有100%绝缘，来自24 V侧0 V的干扰和接地电流将中断通信。使用这种类型的单元可以解决一个问题，但会产生更大的问题！不符合标准的安装现在可能有效，但连接其他设备时可能会出现问题。电缆和总线终端RS485第7节附加安装提示54 3BSE043449R501根据接收者的设计，总线可能处于同一水平，或需要上拉或下拉，以确保在总线处于静止模式（所有变送器断开）时未检测到故障信号。1.一些（旧的）操作员面板具有上拉和下拉电阻，但实际总线终端为120欧姆，类似于Westermo和Profibus。2.较新的面板有另一种类型的接收器，即所谓的内置“故障保护”，其中简单的总线终端电阻就足够了。如果RS485网络上的其他节点需要上拉和下拉，并且操作员面板位于回路的一端，则可以执行以下步骤之一：3.在25极D-sub触点中连接两个1欧姆/0.25 W电阻器。设置跳线引脚。
Communication socket
It is important to ensure that the 24 V feeder in the external insulation is not connected to one of the communication sockets. If it is not 100% insulated to the 24V feed, the interference and grounding current from the 24V side 0V will interrupt the communication. Using this type of unit can solve a problem, but it will create a bigger problem! A non-standard installation may now work, but problems may arise when connecting other devices. Additional installation tips in section 7 of cable and bus terminal RS485 54 3BSE043449R501 According to the receiver's design, the bus may be at the same level or need to be pulled up or down to ensure that no fault signal is detected when the bus is in the static mode (all transmitters are disconnected). 1. Some (old) operator panels have pull-up and pull-down resistors, but the actual bus terminal is 120 ohms, similar to Westermo and Profibus. 2. The newer panel has another type of receiver, the so-called built-in "fault protection", in which the simple bus terminal resistance is sufficient. If other nodes on the RS485 network need to be pulled up and down, and the operator panel is at one end of the loop, you can perform one of the following steps: 3. Connect two 1 ohm/0.25 W resistors in the 25 pole D-sub contact. Set the jumper pin.
