Electromechanical relays

There are several methods available for satisfying the requirements of a robot workcell controller. In this case, the electromechanical relays are one of the methods that can be incorporated as a robot control device. Other than this device, the robot controllers, computers, and programmable controllers can also be used.

A control device that actuates electrical circuits with the help of changes occurred in the incoming signals is known as an electromechanical relay. It is usually used for providing sequence control of electrically operated equipment in the industrial applications. At present, the electromechanical relays are replaced by the advanced robot control device called as programmable controllers.

The electromechanical relays are implemented in simple robot workcells like pick and place operations. Moreover, they are best suitable for robots with limited input and output capabilities. An advantage in this control device is that it will comprise of a safety monitoring system in the cell. To be more specific, it has a gate surrounded at the boundary of a workplace for accessing the workcell.

The electromechanical relays uses suitable sensors like limit switches for specifying the gate closure, and in turn helps in stopping the operation of a robot. In addition, it interrupts the power source and senses the dangerous situations.

An electromechanical relay also includes some disadvantages such as:

  • It is complicated to interface with the computer systems in the plant.
  • The reliability is lower than the computer controllers.
  • It is difficult to exchange to a new workplace control task because it has hard-wired configuration.

A programmable controller can be used to accomplish the functions of an electromechanical relay, and it is also capable of avoiding the above disadvantages.

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