Revised ISA88 Part 5 draft definitions

ISA88 Part 5 draft definitions have been revised using input from comments. Automation object, control strategy, device, and engineered control component are among the terms. See below.

01/20/2011


Dave ChappellWe've revised the Oct. 25 posted ISA88 Part 5 draft language on definitions using comments, suggestions, and questions received. See what you think of the revised language, below, and let me know if you have any further questions or comments or suggestions.

3       Definitions

For the purposes of this part of this draft, the following definitions apply. Definitions and concepts expressed in the Part 1 standard apply, except where differences are explicitly stated in this part. 

3.1       Automation Object (AO)

The grouping of engineered control components that will carry out the requirements of a module. This must include one or more functional strategy components and may include a function manager and a resource manager. An automation object provides public methods to interact with its components.

3.2       Command Processor

The functionality of an AO that will receive commands from a public source and evaluate them to determine what actions to take. Appropriate commands will be passed to the active functional strategy in whatever form the functional strategy requires. The command processor provides public status results of any requested activity.

3.3       Control Strategy (CS)

The actions required to carry out the control described by an operating scheme for any equipment or control module or grouping of such modules.

3.4       Device

A Device is a piece of physical equipment, such as a sensor or actuator, and has no control associated with it. Part 1 refers to this as a Control Module. When control is associated with a device it becomes a Control Module Entity.

.

                   Example – the valve body, actuator and limit switch are devices that when paired with the functional strategy of a control module form an on/off block valve.

                   Example – (From Pierre)

3.5       Engineered Control Component

The part of an automated implementation that provides the control to create an entity as defined in the Part 1 entity model. These components are generally created in the automation environment as part of an engineering effort and will be used to form a control strategy.

3.6       Function Manager

 If the AO functional strategy supports command and control capabilities in a public method the AO function manager provides the public interface and methods to process commands and manage control that is applied to the functional strategy.

3.7       Functional Strategy

The part of an AO containing the control function specifically engineered to carryout the control required by an operating scheme. This AO component must as a minimum provide predefined information in a public way.

3.8       Mode of Action

The mode of action is used to define the behavior of the functional strategy independent of the source of commands. A functional strategy may support the part 1 defined modes of automatic, semi-automatic, manual. Other modes that pertain to the functional strategy may also be supported, for example simulation.

3.9       Mode of Control

Where an AO has more than one functional strategy and/or more than one source of command and control the mode of control will define the behavior of the entire automation object as to who or what can issue commands and which functional strategy will react to those commands.

3.10  Resource Manager

If the AO has multiple functional strategies and/or supports multiple users/owners the AO resource manager will provide a public method to manage the other components of the AO to see the required functional strategy that is active and insure the commands and control are accepted only from approved sources.

David A. Chappell, Complete Manufacturing Automation associates - LLC

www.CMAa-LLC.com

chappell.da@gmail.com

Also read:

Prior postings from the blog: Standard Profits: Make2Pack and ISA88

OMAC standards yield operational savings

Make2Pack’s S88.05: Continuous control to packaging

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