In S88 a General Recipe "expresses equipment and site independent processing requirements" As such it really has nothing to say about transfers, not least because it is possible that different plants may be able provide the equipment in different ways. For example one Unit in one plant may be able to do what 2 units are needed for in another
Much the same can apply to a Site Recipe
It is when we come to the Master Recipe that transfers become important because this level of recipe must address the actual equipment in the plant in its Procedures
So here's a transfer in a Master Recipe procedure, with Send (Transfer Out) And Receive (Transfer In) phases running simultaneously
|PFC showing Transfer from one unit to the next|
And it is the Control Recipe that must actually perform the transfer, by invoking transfer phases in the units between which the transfer is happening
You will note that the diagram shows a Synch line connecting the Source (transfer out) and destination (transfer in) phases. This represents the data flow between sender and receiver.
Please note that these communications should be directly between the two units and should work entirely in the equipment phases,
The next post will cover this in more detail.