Version 5.5. Using Accumulators. Citect Pty Ltd 3 Fitzsimmons Lane Gordon NSW 2072 Australia

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1 Version 5.5 Using Accumulators Citect Pty Ltd 3 Fitzsimmons Lane Gordon NSW 2072 Australia

2 DISCLAIMER Citect Pty. Limited makes no representations or warranties with respect to this manual and, to the maximum extent permitted by law, expressly limits its liability for breach of any warranty that may be implied to the replacement of this manual with another. Further, Citect Pty. Limited reserves the right to revise this publication at any time without incurring an obligation to notify any person of the revision. COPYRIGHT Copyright 2003 Citect Pty Limited. All rights reserved. TRADEMARKS Citect Pty Limited has made every effort to supply trademark information about company names, products and services mentioned in this manual. Trademarks shown below were derived from various sources. CitectSCADA, CitectHMI/SCADA, CitectFacilities and CitectSCADA Batch are regisitered trademarks of Citect Pty. Limited. IBM, IBM PC and IBM PC AT are registered trademerks of Internatrional Business Machine Corporation. MS-DOS, Windows, Windows 98, Windows 2000, Windows XP and Excel are trademarks of Microsoft Corporation. dbase is a trademark of Borland Inc. General Notice: Some product names used in this manual are used for identification purposes only and may be trademarks of their respective companies. October 2003 Edition for CitectSCADA Version 5.5 Manual Revision 1.0 Using Accumulators 2

Defining Accumulators Accumulators keep track of incremental runtime data, such as motor run hours, power consumption, and downtime. You set a trigger (e.g. motor on) to increment three counters: The number of times the accumulator is triggered (e.

3 Defining Accumulators Accumulators keep track of incremental runtime data, such as motor run hours, power consumption, and downtime. You set a trigger (e.g. motor on) to increment three counters: The number of times the accumulator is triggered (e.g. the number of starts for the motor) The run time, in steps of 1 second A totalised value, by an increment you define (e.g. the current) The accumulated data is stored as Variable Tags in an I/O Device. The Variable Tags are read at CitectHMI/SCADA startup, and are updated at regular intervals while the trigger is active. You can monitor and display the accumulated data by animating, trending, or logging the Variable Tags. NOTE You can control (re-read or reset) any accumulator at runtime by using the AccControl() Cicode function. To configure an accumulator: 1. From the System menu select Accumulators 2. Complete the Accumulators form. Use the Help button for more information about the fields. 3. Press the Add button to append a record you have created, or the Replace button if you have modified a record. Accumulators Properties Accumulators have the following properties: Name (16 Chars.) The name of the accumulator. Trigger (64 Chars.) The Cicode expression (or variable tag) to trigger the accumulator. If the result of the expression (in this field) is TRUE, accumulation starts. If the result of the expression (in this field) becomes FALSE, accumulation stops. The frequency with which CitectHMI/SCADA checks the trigger is controlled by the [Accumulator]WatchTime parameter. Using Accumulators 3

4 Run Time (32 Chars.) The variable (tag) that contains the run time (in seconds). On startup, CitectHMI/SCADA reads this value. CitectHMI/SCADA then increments its local copy of this variable (while Trigger is TRUE) and writes the variable (back to the I/O Device) at a frequency determined by the [Accumulator]UpdateTime parameter. No. of Starts (32 Chars.) The variable (tag) that contains the number of starts (i.e. the number of times the trigger changes from FALSE to TRUE). On startup, CitectHMI/SCADA reads this value. CitectHMI/SCADA then increments its local copy of this variable and writes the variable (back to the I/O Device) at a frequency determined by the [Accumulator]UpdateTime parameter. Totaliser Inc (64 Chars.) Any Cicode expression (or variable tag) to add to (increment) the Totaliser variable while the Trigger condition is TRUE. Totaliser (32 Chars.) The variable (tag) that contains the totalised value. On startup, CitectHMI/SCADA reads this value. Each time CitectHMI/SCADA checks the trigger - and the trigger is TRUE - CitectHMI/SCADA adds the value in the Totaliser Inc field to its local copy of this Totaliser variable. CitectHMI/SCADA writes the new Totaliser variable (back to the I/O Device) at a frequency determined by the [Accumulator]UpdateTime parameter. For example, if you configure an accumulator for a motor, and Totaliser Inc is the current (amperage) used by the motor, then Run Time will contain the time (in seconds) that the motor has run, No. of Starts will contain the number of times the motor was started, and Totaliser will contain the total current used by the motor. The average current used by the motor is Totaliser/Run Time. Comment (48 Chars.) Any useful comment. NOTE The following fields are implemented with extended forms (press F2). Privilege (16 Chars.) The privilege required by an operator to perform operations on the accumulator (by using accumulator functions). Area (16 Chars.) The area to which the accumulator belongs. Only users with access to this area (and any required privileges) will be able to perform operations on the accumulator. For example, if you enter Area 1 here, operators must have access to Area 1 (plus any required privileges) to perform operations on the accumulator. NOTES 1) CitectHMI/SCADA stores the run time, number of starts, and totalised value in variables in your I/O Device. This allows easy access to these variables and, because they are saved in the I/O Device, their values are saved if CitectHMI/SCADA is shutdown. You can increase system performance by storing these variables in a Disk I/O Device. (If you store these variables in your external I/O Devices, CitectHMI/SCADA will consume communication bandwidth updating the variables.) 2) If you are using CitectHMI/SCADA on a network, you can use a redundant Disk I/O Device to secure these variables. 3) The accumulator server runs as part of the reports server. If you have a redundant reports server, you must use a primary/standby configuration to stop the accumulators running on both reports servers. Use the CitectHMI/SCADA Computer Setup Wizard to define the reports servers. Using Accumulators 4

5 4) You can control (re-read or reset) any accumulator at runtime by using the AccControl() Cicode function. Using Accumulators 5

Version 5.5. Multi-language Projects. Citect Pty Ltd 3 Fitzsimmons Lane Gordon NSW 2072 Australia

Version 5.5. Multi-language Projects. Citect Pty Ltd 3 Fitzsimmons Lane Gordon NSW 2072 Australia Version 5.5 Multi-language Projects Citect Pty Ltd 3 Fitzsimmons Lane Gordon NSW 2072 Australia www.citect.com DISCLAIMER Citect Pty. Limited makes no representations or warranties with respect to this