ABB DI821 3BSE008550R1 Digital input module

ABB DI821 3BSE008550R1 Digital input module

The local SCANCLK signal increments the output multiplexer, provided you have set the SCAN bit in the Configuration Register. There is no local SCANCLK if SCANCLKEN* is set, so you should clear SCANCLKEN*. This is the power-up condition. The local SCANCLK will be either SCANCLK from the rear signal connector or TRIG0 from the SCXIbus connector, depending on the state of the CLKSELECT bit in the Configuration Register. TRIG0 may be driven with the local SCANCLK if SCANCLKEN* is coming from the rear signal connector and if the CLKOUTEN bit in the Configuration Register is set. Using TRIG0, several modules in one chassis can access SCANCLK from only one rear signal connector.

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