Accumulator Properties

Accumulators have the following properties:

Name

The name of the accumulatorA facility that allows you to track incremental runtime data such as motor run hours, power consumption, and downtime.. Enter a value of 79 characters or less.

Cluster Name

The name of the cluster that this accumulator runs on. If the Cluster Name is not set, then this accumulator will run on each defined cluster.

Trigger

The Cicode expressionA statement (or group of statements) that returns a value. An expression can be a single variable, a mathematical formula, or a function. (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. Enter a value of 254 characters or less.

The frequency with which the trigger is checked is controlled by the [Accumulator]WatchTime parameter.

Run Time

The variable (tag) that contains the run time (in seconds). Enter a value of 254 characters or less. On startup, this value is read. Then the local copy of this variable is incremented (while Trigger is TRUE) and the variable is written back to the I/O Device at a frequency determined by the [Accumulator]UpdateTime parameter.

No. of Starts

The variable (tag) that contains the number of starts (that is, the number of times the trigger changes from FALSE to TRUE). Enter a value of 254 characters or less. On startup, this value is read. Then the local copy of this variable is incremented and the variable is written back to the I/O Device at a frequency determined by the [Accumulator]UpdateTime parameter.

Totalizer Inc

Any Cicode expression (or variable tag) to add to (increment) the Totalizer variable while the Trigger condition is TRUE. Enter a value of 254 characters or less.

Totalizer

The variable (tag) that contains the totalized value. Enter a value of 254 characters or less.

On startup, this value is read. Each time the trigger is checked and while the trigger is TRUE, the value in the Totalizer Inc field is added to the local copy of this Totalizer variable. The new Totalizer variable is written 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 Totalizer 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 Totalizer will contain the total current used by the motor. The average current used by the motor is Totalizer/Run Time.

Comment

Any useful comment. Enter a value of 48 characters or less.

Extended forms fields

The following fields are implemented with extended forms (press F2).

Privilege

The privilege needed by an operator to perform operations on the accumulator (by using accumulator functions). Enter a value of 16 characters or less.

Area

The areaA large application can be visualized as a series of discrete sections or areas. Areas can be defined geographically (where parts of the plant are separated by vast distances) or logically (as discrete processes or individual tasks). 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 need to have access to Area 1 (plus any required privileges) to perform operations on the accumulator. Enter a value of 16 characters or less.

Notes:

• The run time, number of starts, and totalized value are stored 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 the project is shutdown. You can increase system performance by storing these variables in a Disk I/O DeviceA disk file that resides on the hard disk of a computer and emulates a real I/O device. The value of each variable in the disk I/O device is stored on the computer hard disk. The disk I/O device is not connected to any field equipment in the plant.. (If you store these variables in your external I/O Devices, communications bandwidth will be consumed updating the variables.
• If using a network, you can use a redundant Disk I/O Device to secure these variables.
• The accumulator server runs as part of the Reports Server. If you have a redundant Reports Server, you need to use a primary/standby configuration to stop the accumulators running on both Reports Servers. Use the Computer Setup Wizard to define the Reports Servers.
• You can control (re-read or reset) any accumulator at runtime by using the AccControl() Cicode function.