Robot controller

Robot controller includes different types of control technology such as computer, electronic, and limited sequence controllers. Generally, there is only limited I/O capability on complicated types for interfacing with additional equipments. The purpose of I/O interface is to connect the interlocks in the workplace. The incoming signals are joined with the work cycle program by the robot controller. As a result, the output signals and robot movements can be accomplished properly. For example, the playback robots may have 10 to 20 numbers of I/O ports.

The arrangement of robot controller’s I/O ports is described briefly below:

Input ports:

In a robot controller, there may be 10 – 25 input lines. It is usually used for connecting the incoming signals from exterior equipments to the controller. These signals will be in binary, and referenced as logical conditions on the robot program. An important use of this connection is to provide the interlocking capability. At present, the input ports on the new controllers are incorporated with the ability to read in analog signals.

Input port:

Apart from the above, there may be five input lines, which are implemented for safety interlocking.  The robot controller will stop the program and as well as the robot when the signals of outside safety sensors are received in any one of these lines. Sometimes, it may be employed for just turning OFF the manipulator.

Output ports:

As like input ports, there may be 10 – 25 output lines in the controller. The main purpose of these ports is to send the output interlock signals to the exterior equipments. The beginning or finishing of signals will be based on the logical conditions in the robot program, which end in several responses with the exterior equipments. Recently, the new robot controllers have the ability for analog and binary signal outputs.

The above details describe a robot controller with limited I/O capability for a workplace. As like this type, the recently available controllers are also limited for sequence control. Moreover, there will be advanced robot controllers in the future for controlling the superior robots.

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