Mandatory Rules for Hot Swapping

Mandatory rules for hot swapping:

• Between two pull and / or plug operations of I/O modules a pause of at least 1 second must be observed.

  • That means if a module is pulled or plugged there has to be at least a break of 1 second before the next module is pulled or plugged.

• At boot up of CI52x all configured expansion modules have to be physically available.

  • Start up with missing modules is not supported.

• As there is no special configuration available for hot swap terminal units, there is no possibility for the CI52x to generate diagnosis messages if there is no hot swap terminal unit available.

  • This has to be checked by application:

    Best way for checking if a hot swap terminal unit is available or not, is reading out the common device information registers (see MODBUS Communication Interface Module). If the CI52x rejects this read out the CI52x doesn’t support hot swap at all.