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Changes for page 3. Metering Channels

Last modified by Iaroslav Platonov on 2026/06/08 09:57
From version 40.1
edited by Lana
on 2025/11/30 19:37
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edited by Lana
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175 175  * rr_imp - R+ readings
176 176  * rr_exp - R- readings
177 177  
178 -5.3.  Calculated channels via Information Model
178 +=== 5.3.  Calculated channels via Information Model ===
179 179  
180 180  For calculation channels of the same type, it is possible to define custom formulas that operate based on Information Model objects and their attributes. In addition to tags and channels, the Information Model can also supply supplementary data (e.g., reference information). To create a template, click the create template button [[image:Screenshot 2025-11-30 at 16.36.34.png||height="27" width="26"]] as shown in Fig. 5.4.
181 181  
182 -
182 +[[image:Screenshot 2025-11-30 at 16.37.01.png]]
183 +
184 +Fig. 5.4 – Creating a Formula Template
185 +
186 +[[image:Screenshot 2025-11-30 at 16.37.47.png]]
187 +
188 +Figure 5.5. Creating custom formula
189 +
190 +As shown in Fig. 5.5, the custom formula creation window requires input of the formula name, an optional identifier code, and the formula expression. An example demonstrating the calculation of losses in cable lines is provided in Fig. 5.6.
191 +
192 +[[image:Screenshot 2025-11-30 at 16.38.43.png]]
193 +
194 +Figure 5.6. Calculation formula
195 +
196 +[[image:Screenshot 2025-11-30 at 16.39.09.png]]
197 +
198 +Figure 5.7. Using calculation formula
199 +
200 +Fig. 5.7 shows the application of the calculation formula:
201 +3*IM{Object identifier IM}.r_ohm_per_km*pow(agg("mean","{line current}","{Interval}"),2)*0.001, where:
202 +
203 +* **IM{Identifier of the IM object}. r_ohm_per_km **– reference to the value of the attribute with the code **" r_ohm_per_km " "** of the information model object
204 +* **Pow **– exponentiation
205 +* **Agg **is an aggregation function
206 +* **Mean **– average value for the time interval
207 +* **{line current} **– a link to the tag ID
208 +* **{Interval} **– data interval.
209 +
210 + The braces **{ }** contain the arguments that need to be entered in the data entry fields as in Fig. 5.7.
211 +
212 +=== 5.4. Downloading/Uploading calculated channels ===
213 +
214 +The** Downloading/Uploading configuration files** page (Settings > Configuration files) provides functionality for importing and exporting calculation metering channels using Excel files.
215 +
216 +[[image:Screenshot 2025-11-30 at 16.40.46.png]]
217 +
218 +Figure 5.8. Excel file
219 +
220 +Fig. 5.8 shows an example of an Excel file with calculated metering channels, which allows adding new channels, as well as adjusting existing ones. All the necessary functions for entering formulas are available in formula reference interface, as well as in Table 5.1.
221 +
222 +Table 5.1. Functions used in formulas.
223 +
224 +|Function|Description|Example
225 +|diff|Calculating increments from accrual (readings) by channel|diff([dev-2-214]) - calculation of increments from the cumulative total (readings) on channel 214 of device 2
226 +|mean|Average Time Interval|mean by the ID10001 tag for a 1-hour time interval
227 +|integral|Integral of Values|Integral by tag ID40011100 in a 1-hour time interval
228 +|first|Indication at the beginning of the interval|first([ti50206_type5], 3600, 0, 0) – calculation of readings based on the ID50206 tag at the beginning of the interval, calculated every hour
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