Set state in case of bus error

DIG Safe State Active (index 0x80n0:01) / DIG Safe State Value (index 0x80n1:01)

The setting in “DIG Safe State Active” (index 0x80n0:01) defines whether the outputs should assume a safe state in the case of a bus error. The safe state of the output in the case of a bus error is defined with “DIG Safe State Value” (index 0x80n1:01).

  1. “DIG Safe State Active“ = TRUE and
    • “DIG Safe State Value“ = TRUE: the output is switched on.
  2. “DIG Safe State Active“ = TRUE and
    • “DIG Safe State Value“ = FALSE: the output is switched off
  3. “DIG Safe State Active“ = FALSE
    • The state of the output is retained. Entries in “DIG Safe State Value” (index 0x80n1:01) have no effect.

Flow-chart illustration of the sequence in case of a bus error

Set state in case of bus error 1:
Change of state of the outputs in the case of a bus error

Tabular example:

DIG Safe State Active
Index 0x80n0:01

DIG Safe State Value
Index 0x80n1:01

Output before bus error

Output during bus error

Output after bus error

TRUE

TRUE

FALSE

TRUE

FALSE

TRUE

TRUE

TRUE

TRUE

FALSE

FALSE

FALSE

FALSE

TRUE

FALSE

TRUE

FALSE

FALSE / TRUE

FALSE

FALSE

FALSE

TRUE

TRUE

TRUE

Graphical example:

Set state in case of bus error 2:
Graphical illustration of the channel state during a bus error

Notice

Set state in case of bus error 3:

Watchdog settings

Observe the notes in the chapter "Notes on watchdog settings"!