BaSyx / Documentation / API / ControlComponentProfiles

This information is work in progress as part of the BaSys 4.2 project. This section is preliminary and subject to change during the project.

Profiles

An example control component in OPC UA with the following profile: SI=5, OC=4, EM=3, ES=3, OM=4

BaSys control components may be described by the following profiles:

SI - Service Interface Profile

Describes how the offered services are structured and how states are represented.

This profile is special, because it is orthogonal to the other profiles. Hence, every other profile looks a bit different, if a different SI profile is realised in component.

OC - Occupation Profile

Describes whether a occuption is necessary.

Variants may describe whether a occupation with priority or local is possible.

EM - Execution Modes Profile

Describes whether different execution modes are possible.

Variants may describe which modes are possible and how they are called.

ES - Execution States Profile

References the used execution states and their transitions.

May describe variants or subsets of a full execution state state machines.

OM - Operation Modes Profile

Describes whether multiple operation modes are available and need to be selcted.

Variants may describe whether there are specific operation modes, like fallback or startup and shutdown modes.

For example a control component could have the following profile values.

• SI = 5 (OPERATIONS)
• OC = 4 (PRIO)
• EM = 3 (MANUAL)
• ES = 3 (PACKML)
• OM = 4 (MULTI)

The address space of a control component interface in OPC UA is shown in the figure.

Profile Values

All profiles shall be determined with an positiv integer or zero, respectively enums may be implemented. In order to combine profile values and to use them as statements some common values are equal for all profiles, which is presented in the following table. As different profile values in one profile may be combined they are defined by bitmasks. Hence their values are multiples of two and combinations may be represented by bit order operations and integer values. If the value is higher than one any profile values are given.

Bit	Value	Name	Description
1	0	UNKNOWN	No statement about profile or not determined
1	1	NONE	Profile is not realised, used, compliant or implemented
2..n	>1	ANY	One ore more profile values, but not specified which ones
2	2	...	First specific variant or property of the profile.
n	2^n	...	Nth specific variant or property of the profile.

SI Profile

The control component service interface E1 may be realised in various ways. Basys classifies different realisations via profiles. The service interface profile (SI) describes how a control component can be affected by the means of orchestration and how the resulting state changes may be observed. Therefore each profile value defines how the activation interaction likewise the writing of variables or invocation of operations is handled. Moreover, a component has aggregated state values for its state machines, which may be represented by one or more variables at different adresses. State change events may be raised if state variable values change. Consequently, the SI profile also defines how to find the addresses or endpoints of its activation and reaction represenations.

The following table presents an overview and small comparision of possible SI profile values. The major profile of the service interface used in basys is OPERATIONS.

SI value	Name	Activation mechanism	Aggregated state represenation	Utiliziation recommendation
0 - 1	UNKNOWN, NONE	Not defined	Not defined	See common profile values
2	CMD	A string variable called CMD (command input) with a specific syntax is used to activate service operations	A flat list of variables of all aggregated component states under a containing element (folder)	Process control applications with IEC 61131
4	OPERATIONS	A flat list of operations of all offered services under a containing element (folder)	A flat list of variables of all aggregated component states under a containing element (folder)	Advanced components or as additional interface
8	SERVICES	Operations are grouped under service elements	State variables are grouped under service elements	Advanced and modular components
16	VARIABLES	Multiple (spread) variables are used to activate service operations	Multiple (spread) variables are used to represent the component states	Very generic but needs mapping description. Not standardized browseable. May be mapped to NAMUR MTP

Note on NAMUR Module Type Package (MTP): in the future, basys will map the description for the orchestration of modules that are described via a NAMUR MTP to profiles. Therefore an existing profile value like VARIABLES may be used or a new profile value may be necessary.

OC Profile

The occupation profile describes, whether a control component can be occupied. This is important for an orchestrator, as it has to be checked, whether the component is free and it has to be occupied before operation. Further more, the occupation profile determins, whether it is possible to occupy the component with a higher priority, for example by an operator or maintenance person. An OC profile value of two or higher (ANY) requries the component to have an OCCUPIER variable to determine who occupies the component. Moreover, the OCCST variable is needed to differentiate occupation states.

Value	Name	Description	Possible OCCST values	Possible ORDERs
0 - 1	UNKNOWN, NONE	See common profile values	Undefined
2	OCCUPIED	Normal occupation possible	FREE, OCCUPIED	FREE, OCCUPY
4	PRIO	Priority occupation possible	FREE, PRIO	FREE, PRIO
8	LOCAL	Local overwrite	FREE, LOCAL

EM Profile

The execution mode profile describes which execution modes are available. A component is assumed to be in AUTO like mode at all time, if the ES value is NONE. An ES value of two or higher (ANY) requires a EXMODE variable to determine the current mode.

Value	Name	Description	Possible EXMODE values = Possible ORDERs
0 - 1	UNKNOWN, NONE	See common profile values	Undefined
2	MANUAL	Additional manual mode available	AUTO, MANUAL
4	SEMIAUTO	Additional semiautomatic mode available	AUTO, SEMIAUTO
8	SIMULATE	Additional simulation mode available	AUTO, SIMULATE

ES Profile

In general different execution state machines or subsets are used in different domains or companies. For example ANSI/ISA-88.00.01-2010, MTP Part 4 or OPC UA Part 10 may be used.

BaSys recommends the use of the PackML state machine, as it is possible to map the other state machines to it. The execution state profile defines which subset of the PackML execution state machine are used. The EXST variable has to be present, if an ES value of two (ANY) or higher is given. A control component with ES profile value one (NONE) is assumed to be in the EXECUTE state at all time and hence it can not be halted, suspended, stopped or aborted.

Value	Name	Possible EXST States	Possible ORDERs
0 - 1	UNKNOWN, NONE	See common profile values
2	COMPLETE	EXECUTE, (COMPLETING), COMPLETE, (RESETTING), IDLE, (STARTING)	START, RESET
4	SUSPEND	EXECUTE, (SUSPENDING), SUSPENDED, (UNSUSPENDING)	SUSPEND, UNSUSPEND
8	HOLD	EXECUTE, (HOLDING), HELD, (UNHOLDING)	HOLD, UNHOLD
16	STOP	EXECUTE, (STOPPING), STOPPED, (RESETTING), IDLE, (STARTING)	START, STOP, RESET
32	ABORT	EXECUTE, (ABORTING), ABORTED, (CLEARING), STOPPED, (RESETTING), IDLE, (STARTING)	ABORT, CLEAR, RESET, START

OM Profile

The operation mode profile defines whether different operation modes are selectable. A control component with an OM value of two or higher has to represent the current operation mode via OPMODE state variable. The OM value NONE yields to a control component, that has no operation modes to select and is therefore assumed to be in BSTATE (basic state) at all time.

Value	Name	Description
0 - 1	UNKNOWN, NONE	See common profile values
2	MULTI	Multiple, application specific modes available.
4	PARALLEL	Parallel executable operation modes with own execution states. See components with concurrent behavior.	8	CONTI	Conti process operation mode with startup and shutdown: BSTATE, STARTUP, SHUTDOWN