German Roessel plug Roessel model Roessel price

Roessel plug terminal blocks, as a type of connector, are important components in the electrical industry, playing an irreplaceable and significant role. Since engineering technicians start troubleshooting by checking interfaces, i.e., terminals, the design of terminal blocks is particularly important. Terminal blocks can be classified into: European-style terminal block series, pluggable terminal block series, transformer terminal blocks, building wiring terminals, barrier-type terminal blocks, spring-type terminal blocks, DIN rail terminal blocks, wall-through terminal blocks, and optocoupler terminal blocks. The plastic insulation materials and conductive parts of terminal blocks directly affect their quality, determining the insulation performance and conductivity of the terminals respectively.

Roessel plug applications

Mainly applied in lighting, communications, security, and other industries. Pluggable terminals have the widest range of applications, such as in variable frequency drives, explosion-proof equipment, CNC panels, access control controllers, sensors, PLC, instruments, power supplies, servo drives. The common requirements for pluggable terminals in these industries are: smooth insertion and extraction force, low contact resistance, and sufficient service life and fatigue resistance, which imposes high requirements on the material of metal spring contacts. This requires product designers to have experience in structure and material selection. Barrier-type terminals are mainly applied in: power supplies, relays (especially double-layer terminals), inverters, elevator industry (less common), and air conditioning. Requirements for this series of terminals include high torque requirements for screws during wire crimping, the distance when the screw is retracted to its highest position must be greater than the maximum wire clamping range, long-position terminals must not warp or deform, and screws must have high corrosion resistance.

Roessel plug advantages

1) The dual-bus structure oriented towards memory offers higher information transmission efficiency, which is its main advantage. However, conflicts still occur when both CPU and I/O interfaces access memory. 2) The CPU connects to high-speed local memory and local I/O interfaces via a high-transmission-rate local bus, while slower global memory and global I/O interfaces connect to a slower global bus, thereby accommodating both high-speed and slow-speed devices without mutual interference. 3) Simplifies hardware design. Facilitates modular structural design; microcomputer designs oriented towards buses only need to manufacture cpu modules, memory modules, and I/O modules according to these specifications, and connect them to the bus to operate, without considering detailed bus operations. 4) Simplifies system structure. The overall system structure is clear. Fewer connections, and backplane wiring can be printed. 5) Good system scalability. First, scale expansion merely requires inserting more modules of the same type. Second, functional expansion merely requires designing new modules according to bus standards, and the insertion positions for modules often have no strict limits. 6) Good system update performance. Since cpu, memory, I/O interfaces, etc., are connected to the bus according to bus protocols, as long as the bus design is appropriate, new modules can be designed at any time following advancements in processor chips and other related chips. Inserting new modules into the backplane updates the system, generally without modifying other modules and backplane wiring. 7) Facilitates fault diagnosis and maintenance. Motherboard test cards can conveniently locate faulty areas and identify bus types.

Roessel plug usage precautions

Fieldbus is gradually being promoted in industrial sites. Many devices not only have traditional instrument functions but also possess fieldbus capabilities. In DCS, fieldbus is widely used. The following issues should be noted when using fieldbus: 1) Communication distance. Fieldbus communication distance generally has certain requirements. For example, PROFIBUS/DP at a rate of 12Mbps can reach 200m using standard cable; if using a rate of 187.5kbps, it can reach 1 000m. Communication distance has two meanings: first, the distance achievable between two nodes without repeaters; generally, distance is inversely proportional to communication rate; second, the distance between the two farthest nodes in the entire network. Manufacturers' descriptive materials for this are often unclear. In actual use, the scope of the entire network must be considered. Electromagnetic signals take time to transmit through cables, especially in some high-speed fieldbuses. If the distance is increased, some communication parameters must be modified. 2) Cable selection. The site environment determines the fieldbus communication speed and medium. Generally, fieldbus uses electrical signals to transmit data, inevitably affected by the surrounding electromagnetic environment during transmission. Most fieldbuses use shielded twisted pair cables. Note that different types of fieldbuses may require different shielded twisted pair cables. Fieldbus developers generally specify a special cable, and the specified rate and transmission distance can only be achieved under correct usage of this cable. Under extremely poor electromagnetic conditions, optical fiber is a reasonable choice; otherwise, local interference may affect the operation of the entire fieldbus network. 3) Isolation. Generally, fieldbus electrical signals are electrically isolated from the device interior. Fieldbus cables are distributed throughout the workshop. If high voltage intrudes, it will damage the bus transceivers of all devices in the network segment. Without isolation, high voltage signals will continue to damage other internal circuits of the device, leading to serious consequences. 4) Shielding. The outer layer of the shielded cable used in fieldbus must be grounded at a single point. If high-frequency interference is severe, multi-point capacitive grounding can be used; multi-point direct grounding is prohibited to avoid ground loop currents. 5) Connectors. Fieldbus generally does not have strict regulations for connectors, but improper handling can affect system communication. For example, fieldbus generally uses a bus-type daisy-chain connection method. When connecting each device, attention must be paid to how to insert and remove devices without affecting existing communication, which imposes certain requirements on connectors. 6) Termination matching. Fieldbus signals, like all electromagnetic wave signals, exhibit reflection phenomena. Resistive matching should be used at both ends of each network segment of the bus. The first function is to absorb reflections, and the second is to achieve correct voltage levels at both ends of the bus to ensure communication. Therefore, fieldbus technology is the intersection and integration of control, computer, and communication technologies. Its emergence and rapid development reflect the control field's requirements for reducing costs, improving reliability, enhancing maintainability, and increasing the intelligence of data acquisition.

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