<8. Detailed Description>
2. Example of Single-loop NPAS_PID with CAS connection to
NPAS_PG_L30_BP
This sample application adds a program set POU (NPAS_PG_L30BP) to the earlier
single-loop NPAS_PID sample by making a cascade connection to terminal CAS_IN
of the NPAS_PID.
Analog input : AI002 Analog output : AO002
NPAS_PID : FIC002 Tag comment : TEST
NPAS_PG_L30_BP : FIC002_PG Tag comment : TProgram
The following first figure shows the application represented in FBD or LD, while the
following second figure shows the same application represented in ST. It can be
seen that FBD and LD logic allows easy visualization of not only the data flow from
left to right but also the CAS connection between NPAS_PG_L30BP and
NPAS_PID.
In the ST application, adding one NPAS_PG_L30_BP adds 11 lines of expressions.
The cascade connection between NPAS_PG_L30BP and NPAS_PID is expressed
by line 21 of the application.
With the ST application, it is relatively harder to visualize the data flow and CAS
connection.
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