PFEA113-65 ABB 3BSE028144R0065 Module control system parts

PFEA113-65 ABB 3BSE028144R0065 Module control system parts

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With selection code -1...-99, the master can move backwards from the newest event

as many events as defined by the selection code and read that specific event record.

After this, the master can continue reading the following records using selection

code 1, irrespective of whether they have been read before.

* Special case: If there is not as many events in the buffer as specified by the

selection code, the oldest stored event is read.

Selection code 3

The Modbus event buffer is cleared with selection code 3. Clearing the buffer does

not require any read operation to follow.

Digital inputs

As the master may not detect the state changes of all digital signals when scanning,

an additional change detect (CD) indication bit is created for every momentary

indication point; see the example below.