Operator interface for a photoelectric control unit

A photoelectric control unit for sensing the presence of target objects by periodically transmitting light pulses and synchronously detecting return light pulses, comprising:

• an electronic system for periodically generating light pulses and synchronously detecting light pulses including a microprocessor control system having a plurality of different control functions whereby the operational features of said control system can be regulated;
• and
• an operator interface operable in a first programming mode for interactively displaying a plurality of operating parameters to the operator and accepting operator inputs to modify said operating parameters, and a second running mode for displaying indications identifying which of said operating parameters are in active control of said operational features;
• wherein said identifying indications comprise a plurality of icons, each of which provides a visual indication as to both the activation of one of said operational features in said running mode and the selection for interactive modification of the same operational feature in said programming mode.