Light Curtain Muting Circuit

First we test the safety light curtain and latch reset with mute off.

Light curtain muting circuit.

Also the status output for the mute light changes to green. Safety light curtains can be used in a variety of different modes such as muting blanking and floating blanking depending on the needs of the application. When enabled a function block is purple with a 3 second count down timer. In normal operation if a light curtain detects an object it causes the safety system to stop any hazardous motion in the hazardous area.

The muting circuit for the light curtain must also be appropriately configured for the discrete item s transition speed so that the curtain doesn t remain in a deactivated state. The timer monitoring the 4 seconds shall be a safety related item. Safety light curtains reliably and cost effectively protect against access into hazardous points and areas. If it s muted for too long the curtain will allow access to the safety hazard and obviate its purpose.

The light curtain s ossd outputs turn on once its field of view is no longer interrupted. In material handling applications material is allowed to pass through the protective field without shutting down the machine. This post will help clarify the difference between the two so the correct safety light curtain functionality is chosen and the machine runs safely. When a fault in the internal circuitry or an output is detected the light curtain responds by turning off its ossd outputs.

The light curtain monitors its internal circuitry and its ossd ou tputs for faults. Depending on the variant different machine functions are integrated or can be selected via safe control solutions. The terms muting and blanking are frequently used incorrectly. Muting or bypassing of the psd during the upstroke of the press slide is permitted for parts ejection circuit checking and feeding.

It sounds easy but configuring a muting circuit appropriately. Next lets test the mute function. Light curtain with muting two sensor l type and configurable safety relay introduction light curtains are used to detect attempted access to a hazardous area. From the instant the first of the two muting sensors is cleared.

After 3 seconds the status output and mute function turn off. Muting light curtain monitoring relays allow the automatic temporary suspension of the safety function if certain conditions are met. Muting shall be desabled as soon as the light curtain is cleared and not later than 4 seconds max.