FANUC A20B-2901-066 Input module

FANUC A20B-2901-066 Input module

 Synchronous monitoring with twin-channel control, both safety channels are mutually monitored with synchronous time tS. Safety channel CH1 must close before CH2 and the bridge S33/S35 must be switched. If CH2 closes before CH1 the synchronous time tS = ∞, the synchronous monitoring is switched off.The function corresponds to that of the SNO 4062K without synchronous monitoring. The unit is suitable for attaching to short-circuit forming switching mats, switching bars or switching corners in 4-conductor technology (without monitoring resistance).

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The unit must be operated in a twin-channel 

manner with cross short detection. At a resistance < 50 Ω / channel and a short-circuit between the channels (S11/S12 and S21/S22), the enable circuits open and the LED SUPPLY flashes. Input debouncing prevents rapid switching one after the other of the enable circuits if the safety inputs are opened shorter than tASP. If the safety inputs are open longer than tASP, this leads to opening the enable circuits after tR. Restarting is blocked for the period tSP. With applications for tactile operating modes (rapid off/on cycles, e.g. with manual feeding) we recommend input debouncing for the SNO 4062KM.

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