Focus consists of two units, a transmitter unit and a receiver unit. All the optical units are scanned regularly so that all objects that are placed between the transmitter and the receiver will be detected.

If any light beam is interrupted, the dangerous machine movement will be stopped by the outputs from the light curtain. The reaction time for the Focus varies from 14ms to 45ms, depending on the number of beams in the light curtain. The five LEDs in the receiver and the two in the transmitter show the status of the light curtain/grid.

Safety Outputs OSSD1 and OSSD2

Focus has two PNP outputs—OSSD1 and OSSD2. If the load to be switched is alternating current or requires a higher current than 500 mA, then one should use a safety relay, e.g. RT9, Pluto PLC or the FRM-1 unit (converts the outputs to relay contacts) from Jokab Safety. The FMC-Tina and Tina 10A/10B converts the outputs to a dynamic signal for connection to Pluto or Vital. Pluto can also work directly with the OSSD outputs.

Focus Reset

On every Focus there are inputs for reset and other functions—Reset, Alignment and Override (bypassing is only possible when muting is used).

Reset possibilities:

• Automatic reset—when the light field is free the outputs are closed directly.
• Manual reset—Focus gives a ready signal when the light field is free and the reset button has been actuated.
• Time reset—during manual reset. To reset the Focus a pre-reset button must first be actuated and afterwards, within 8 seconds, a reset button outside the risk area must be actuated.

Choice of reset:

Reset alternatives are chosen with double changeover switches in the Focus receiver.

Note: For further technical information, please reference the Focus Operating Manual.