What does PR[1,3] = PR[1,3] + 15 mean?

The expression PR[1,3] = PR[1,3] + 15 specifically refers to the third element of the position register associated with the index of 1. In FANUC programming, position registers (PR) are used to define specific coordinates, and they are typically structured in a way where the first index represents the specific register, and the second index denotes the specific element of that register.

In this case, PR[1,3] corresponds to the Z coordinate of the position register number 1. When the operation adds 15 to this value, it indicates that the Z coordinate of that position is being increased by 15mm. This is crucial in programming movements for robots, as it directly affects the vertical positioning of the robot in its working environment.

Understanding this structure is essential, as it allows programmers to manipulate positions accurately and efficiently in their robotic applications.