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Exchanging Data Using SCADA and Other Software Section 3-4
Process for
Exchanging Data with
SCADA Software or
Programmable
Terminals
All analog signals in Loop Controllers are processed in percentage units, and
not in engineering units. Also, Loop Controller ITEM data input/output with
external devices is performed via the CPU Unit HMI data area (the specified
bank of the EM Area).
This means that the following processing must be performed using SCADA
software or a PT (Programmable Terminal) to read or write Loop Controller
ITEM data.
• Based on a correspondence table called the CSV Tag File, such as Tag
name/Tag ITEM - Engineering Units/Scaling - CPU Unit EM Area
address,
• Use SCADA software or a PT to specify the tag name/tag ITEM. Specify
the EM area address in the CPU Unit.
• When reading data: Read the percentage unit value and convert to engi-
neering units (scaled value).
When writing data: Perform the reverse action, i.e., convert the engineer-
ing units to percentage units, and write this scaled value.
Note 1. CSV tag files are created using the CX-Process Tool software.
2. For OMRON NS-series PTS, use the WS02-NSFC1-E NS Face Plate
Auto-Builder to automatically generate a project file for NS-series PTs,
based on CSV tag files (configured with special process face places for
Loop Controllers.) This allows Loop Controller monitoring and tuning (data
read/write in engineering units) to be performed easily from a PT, without
having to create screens and make CPU Unit EM Area settings.
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