Parallel wiring

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The parallel wiring is or was used to connect controls with sensors and actuators in the field of automation technology. A specific line is permanently assigned to each signal . This means that all signals each need a separate line. Both analog and digital signals can be transmitted. In safety-critical areas, parallel wiring is still sometimes used nowadays. Safety signals are also transmitted in addition to the data signals.

Disadvantages of parallel wiring compared to fieldbus systems

Some fieldbus types such as the AS-Interface (ASi) also offer safe concepts. As the number of components (sensors and actuators) in a system with parallel wiring increases, the connections can quickly grow into a rather extensive cable harness . Since the 1980s, the use of parallel wiring has therefore been abandoned more and more frequently. Instead, field buses are often used because they require less wiring and are more flexible. A two-wire cable is usually used here. This often results in a lower cost than parallel wiring. However, there are also increasing costs for fieldbus-compatible peripheral devices and their infrastructure.

Disadvantages of parallel wiring in brief:

• higher assembly costs
• higher assembly effort
• high control cabinet volume
• low flexibility