Table of Contents

Accumulator Difference driver

Description

This driver monitors an accumulating field value, for example an energy (kWh) or volume (L) register that continuously counts up. The driver captures the field value at a given interval (hourly, daily etc..) and computes the difference between the start and end of the interval. Current value and the four previous are provided.


Settings (center panel)

Name - The name is up to the user. Our suggestion is to choose a naming convention that makes the viewing the device list intuitive. Such as referring to the sensor and/or application. Keep the name short as it will be combined with the register name to create the default “Field” name (if added to “Fields”)

Active Check box - Check this box and “Save changes” to run the driver. The driver program can be suspended by unchecking the box and clicking on “Save changes”.

User Notes - This space can be used to store information specific to the device and your application, such as: the asset being monitored, the purpose of monitoring, etc.

eze System Notes - In this space we provide a description of the driver's function.


Accumulator Field - Use the drop-down menu to select the Field to be monitored.

Interval - Use the drop-down menu to select the differential's interval. Options are; Hourly, Daily, Weekly, Monthly or Yearly.


Status & Registers (right panel)

Device Status

Driver info - Typically this is the name from the program file

Driver updated/version - Date loaded or updated and the version of the driver

Battery & Signal - Signal indicates the progress through the script. If driver fails to operate, signal number indicates progress

Driver status - Color and text of status bubbles give a quick visual reference of Communication, Operation, and Application

Communication - Com count indicates number of successful and unsuccessful data packets received


Available registers

Reg # Reg Name Description
1 Accumulator value Current value in selected Field
2 Current interval partial diff Differential between value at beginning of interval and current value
3 Previous interval diff Most recent interval differential captured. Daily example: Yesterday's differential
4 2nd interval diff Second most recent interval differential captured
5 3rd interval diff Third most recent interval differential captured
6 4th interval diff Fourth most recent interval differential captured
7 Value at start of current interval Speed of travel is given as meters per second
8 Interval identifier Current interval step, out of a complete cycle (expressed as a number). See table below

Interval option Description Cycle Example of number reference
Hourly Begins at top of hour 0 to 23 0 = Midnight to 1 am
Daily Begins at Midnight 1 to 31 1 = 1st day of Month
Weekly (Mon-Sun) Begins Monday 1 to 52 1 = Monday
Weekly (Sun-Sat) Begins Sunday 1 to 52 1 = Sunday
Monthly Begins first of the Month 1 to 12 1 = January
Yearly Begins January 1st N/A