Unit Block Interface

The following figure shows the unit block interface between AVEVA Batch Management with Foxboro DCS components and Foxboro DCS Control Processor unit blocks. AVEVA Batch Management with Foxboro DCS components does not turn unit blocks on and off. Note that there is no Start control signal in the following figure as there is for phases in the phase block control state diagram.

Before allocating a unit, AVEVA Batch Management with Foxboro DCS components check the unit block status word. If it is an acceptable value, AVEVA Batch Management with Foxboro DCS components allocates the unit and downloads all recipe parameters to the unit block.

On AVEVA Batch Management with Foxboro DCS components displays, when a batch (not a phase) Hold, Restart, or Abort action is initiated, AVEVA Batch Management with Foxboro DCS components sends the corresponding unit control signal to all the units allocated for the corresponding batch. AVEVA Batch Management with Foxboro DCS components does not verify that these unit control signals are used.

Foxboro DCS logic controls setting the unit block unit status word, which is monitored by AVEVA Batch Management with Foxboro DCS components for a satisfactory status before allocating the particular unit block. During batch processing, AVEVA Batch Management with Foxboro DCS components sends the batch status information (Run, Held, and Aborting) to all the unit blocks associated with the batch.