<9. Advanced Engineering >
● Upstream to Downstream Status Propagation
In the figure below, input information of AI001 and AI002 are converted to CData_
REAL data type by input processing POU NPAS_AI_ANLG, and passed to
NPAS_PID. At this time, status information of the device label variables are
converted from WORD data type to DWORD data type, and passed as Status in a
CData_REAL type structure to NPAS_PID.
In the figure below, AI001 information enclosed by a green box is passed from
NPAS_AI_ANLG_1 to NPAS_PID_1. Similarly, AI002 information enclosed by a red
box is passed from NPAS_AI_ANLG_2 to NPAS_PID_2.
Information of NPAS_PID_1 is passed from the OUT terminal of NPAS_PID_1 to
the CAS_IN terminal of NPAS_PID_2, as indicated by the green arrow line.
● Downstream to Upstream Status Read Back
Next, let’s consider the read back of downstream status to upstream.
Read back connection is described in the NPAS POU online help and in Section 2.2,
“Flow of Read Back Data” of IM34P02P25-01E “NPAS POU – Overview.”
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