ABB DDO02 Channel intelligent module

This is an optional functionality that can be used to prevent unexpected results when changes are performed to existing producer and consumer exchanges. The purpose of the Configuration Signature (CS) is to guarantee that the produced exchange will contain data in a format expected by a consumer. Therefore, it prevents the consumer from processing received data exchanges which may have an incompatible format due to producer configuration changes. The Configuration Signature consists of two one-byte integer value (CS Major and CS Minor). The CS Major must be equal for both Producer and Consumer exchanges. The CS Minor reflects backward compatible modifications made to an exchange (for example: adding registers to the producer exchange count). Truncating data within an exchange (send less data than before) would not be backward-compatible and, therefore, would require a change in the major number to prevent processing errors.

Whenever a consumer receives an exchange message

it will look for a configured consumer exchange that contains the same Exchange ID. If it finds a matching produced exchange it will compare the Configuration Signature for validation. If the exchange is not validated, then the data will not be consumed. By default, thewill perform validity checking but can be configured to ignore validity checking. To disable validity checking, configure all exchanges with both CS Major and CS Minor values equal to ZERO (0). When acting as a consumer, the following rules are used by the module to validate an exchange based on its Configuration Signature

Rules for CS Validation 

An exchange will be considered valid if at least one of the following conditions is true:
Producer CS Major and CS Minor are both equal to 0
Consumer CS Major and CS Minor are both equal to 0
Producer CS Major is equal to Consumer CS Major AND Producer CS Minor is greater than or equal to Consumer CS Minor The following table contains some examples that will help you to understand the consumer criteria to validate received exchanges based on the Configuration Signature:Producer CS value of 0.0 (Major.Minor) validates the exchange

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