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Physical I/O Addressing
For I/O points such as discrete inputs and outputs, and analog inputs and outputs, a specific point is requested by specifying its “TPL” or Point Type, Parameter, and Physical Location in the I/O module rack.
NOTE: This is more commonly known as “TLP” in the ROC Protocol, but the format used in ACM is “TPL.”
Point Type and Parameter
The Point Type and Parameter can be represented by text, number, or a combination of the two. For example, if you wanted to request the “Filtered EU value (Parameter 14)” of the “ROC Analog Input (Point Type 3),” you could enter the “ROC Analog Input (Point type 3)” as the text “AI” or as the number “3,” and the “Filtered EU value (Parameter 14)” as the text “FILTERED_EU” or as the number “14.” Item names are not case sensitive.
Examples:
| Tag | Description |
|---|---|
| DI.EU_VALUE:0 | Item name in upper case. |
| di.eu_value:0 | Item name in lower case. |
| DI.21:0 | Parameter name replaced with its parameter number. |
| 1.EU_VALUE:0 | Point type name replaced with its point type number. |
| 1.21:0 | Both the point type name and parameter name replaced with their numbers. |
NOTE: Most of the point types and parameters can be found in the “Protocol Items” section of this manual, and all of the point types and parameters can be found in the ROC and ROC Plus Protocol Specifications Manuals as provided by the manufacturer.
Physical location numbers in the ROC unit begin at one (1), whereas physical location numbers for the ROC protocol in ACM are zero-based and begin at zero (0). The Physical location can be found when configuring the RTU in ROCLINK, and can be related to the meter run number or can be displayed in ROCLINK as “Point Number”. Point number will be displayed in ROCLINK in one of two ways, but when used with ACM, it will need to be converted into its decimal equivalent. The screenshots and tables below indicate where to find the Point Number and the definition of the conversions.
Point Number in ROCLINK
The Point number can be found on this display in ROCLINK:
Converting Point Number to decimal equivalent
Use the following syntax to address I/O points by their physical location:
<T.P:L> or <IO Point Type>.<Parameter>:< Physical Location >.
Examples:
Use AI.FILTERED_EU:0, 3.14:0, AI.14:0, or 3.FILTERED_EU:0 to read the Filtered EU parameter from an AI module located in point number A1.Use DI.STATUS:4, 1.2:4 to read the Status parameter from a DI module located in point number A5.
Standard Items
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