The SCADAPack 50 device has four physical digital points (DI1-DI4) and four physical analog points (A1-A4).
These physical points are represented in the device software by logical points, of which there are eight (V1-V8). However, there is not necessarily a one-to-one relationship between the logical and the physical points.
A logical point maps onto specific physical points. Two logical points can map to a single physical point.
The relationship between the logical and physical points is as follows:
| Physical Point (DI=Digital A=Analog) | Possible Logical Point Mapping | Possible Var Types |
|---|---|---|
| DI1 | V1,V5 |
Digital Input, Counter, Flow, Closed Contact Duration. |
| DI2 | V2,V6 | |
| DI3 | V3,V7 | |
| DI4 | V4,V8 | |
| A1 | V1,V5 |
Analog Input. |
| A2 | V2,V6 | |
| A3 | V3,V7 | |
| A4 | V4,V8 | |
The Var Type describes what you can set the logical point to record.
There are three counters associated with each physical digital point, as follows:
- Digital Input Counter. This counts how many circuit transitions (open-closed-open) have occurred for this point.
- Closed Contact Duration. This counts the accumulated duration (in integer seconds) that a closed circuit has existed for this point.
- Flow. This is a count of the number of circuit transitions (open-closed-open) that have occurred in a particular record period. Once the device reports this count, at the end of the record period, it automatically resets the count.
For more information, see the SCADAPack 50 device documentation.
Logical points V1 and V5 both map to the physical digital point DI1. Logical Point V2 maps to the physical analog point A2.
Logical point V1 records the Counter value associated with DI1. Logical point V5 records the Closed Contact Duration value associated with DI1.
Logical Point V2 records an analog input.
| Physical Point | Logical Point | Var Type |
|---|---|---|
| DI1 | V1 | Counter |
| A2 | V2 | 4-20 mA |
| DI1 | V5 | Closed Contact Duration |