Identification should include

structural components
power source
lighted power switch (covered or lockout-capable in off position)
beepers and lights on axis movement
object detection in movement direction, auto-slowdown
control system
switches/fuses/circuit breakers for circuit isolation and disabling motion control while leaving the CPU and human machine interface (HMI) active.

Process/Skill Questions:

What role do notification components have in creating safe use of a robotic system?
What are pinch points?
Why is it important to include notification components in a robotic system?
Why should motion control be disabled when the CPU and HMI are active?
What are some safety considerations of a wheeled system?