The logic below shows one way of emulating the 984 LL TEST block. The logic below was written to approximate the operation of the TEST block. It is not meant to exactly duplicate its operation.

In this example, the logic was written inside the Concept DFB editor so a single block could be used in the actual application.
Three DFB outputs (datatype Boolean) were created Greater, Equal, and Less.
Two DFB inputs (datatype Integer) were created Input_1, and Input_2.

Below is the DFB running in an application:

Released for: Schneider Electric India