Life cycle data for process plant: Reference data for observations and measurements: 4.6 Monitoring activity


Life cycle data for process plant: Reference data for observations and measurements	ISO/WD 15926-x:200x(E)

Cover page
Table of contents
Copyright
Foreword
Introduction
1	Scope
2	Normative references
3	Terms, definitions, abbreviations and symbols

4	Observations and measurements reference data
	4.1	Introduction to observations and measurements reference data
	4.2	Observing activity
	4.3	Information
	4.4	Temporal part and time
	4.5	Variation of property
	4.6	Monitoring activity
	4.7	Monitoring criterion

A	Information object registration
B	Document URN
C	Reference data relationships
D	Reference data as OWL
E	Temporal part example
Bibliography
Index

4.6 Monitoring activity

4.6.1 What is a monitoring activity

A monitoring_activity receives information about a time_variation_of_property from an observing_activity and issues messages according to pre-set criteria.

EXAMPLE 1 Consider the activity which monitors the temperature of mill M_101 during 2007-12-13, shown in Figure 1.

Figure 1: Monitoring example

There are two activities linked by a flow of information:

a measuring_activity which measures the temperature of mill M_101; and
a monitoring_activity which issues a message whenever the temperature crosses one of two set levels, going up.

The measuring_activity is recorded as follows:

:Measure_oil_temperature_for_mill_M-101_during_2007-12-31
   a               iso15926-x:measuring_activity ;
   iso15926-x:observes_variation_of_property ;
                   [ a                       iso15926-x:time_variation_of_property ;
                     rdfs:subPropertyOf      myOnt:oilTemperature ;
                     iso15926-x:domain_of_variation
                                             :M-101_during_2007-12-31
                   ] ;
   iso15926-x:gives_result_record
                   :Oil_temperature_for_mill_M-101_during_2007-12-31_signal .

The definition of the domain of variation is:

:M-101_during_2007-12-31
   iso15926-2:temporal_part_of :M-101 ;
   iso15926-x:during
        [ topology:end_1_of_edge [ iso15926-x:utc_iso8601 "2007-12-30T24:00" ] ;
          topology:end_2_of_edge [ iso15926-x:utc_iso8601 "2007-12-31T24:00" ] ] .

The monitoring_activity is recorded as follows:

:Monitor_oil_temperature_for_mill_M-101_during_2007-12-31
   a               iso15926-x:monitoring_activity ;
   iso15926-x:reads_record
                   :Oil_temperature_for_mill_M-101_during_2007-12-31_signal ;
   iso15926-x:has_monitoring_criteria_set
                   [ owl:oneOf ( :Mill_type_ABC_OilTemperatureHigh
                                 :Mill_type_ABC_OilTemperatureHighHigh ) ] .

The complete set of criteria for a monitoring_activity is specified by a has_monitoring_criteria_set.

A temporal part of time_variation_of_property can be a member of a monitoring criterion.

EXAMPLE 2 The monitoring criteria for the monitoring_activity in example 1 are:

"oil temperature high" - the oil temperature goes above 100 degrees Celsius; and
"oil temperature high high" - the oil temperature goes above 150 degrees Celsius.

These criteria can be defined as follows:

:Mill_type_ABC_OilTemperatureHigh
  [ owl:intersectionOf (
     [ a                 iso15926-x:level_crossing_criterion ;
       iso15926-x:set_level     [ iso15926-4:celsius [ basics:decimal "100" ] ] ;
       iso15926-x:set_tolerance [ iso15926-4:celsius [ basics:decimal "5" ] ] ]
     iso15926-x:going_up ) ] .

:Mill_type_ABC_OilTemperatureHighHigh
  [ owl:intersectionOf (
     [ a                 iso15926-x:level_crossing_criterion ;
       iso15926-x:set_level     [ iso15926-4:celsius [ basics:decimal "150" ] ] ;
       iso15926-x:set_tolerance [ iso15926-4:celsius [ basics:decimal "5" ] ] ]
     iso15926-x:going_up ) ] .

The set_tolerance prevents multiple level crossing messages being generated when the temperature hovers around the specified level.

The class going_up is included as part of the criterion, to prevent level crossing messages being generated when the temperature falls.

A monitoring_activity issues a message whenever it finds a temporal part of a time_variation_of_property which is a member of one of its criteria.

EXAMPLE 2 The variation of the oil temperature for mill M_101 during 2007-12-31 has two level crossings, as shown in Figure 2.

Figure 2: Two level crossings in a property variation

The monitoring_activity issues two messages which contain formulae as follows:

Oil_temperature_for_mill_M-101_during_2007-12-31_message-1

[ a                       iso15926-x:time_variation_of_property ;
  rdfs:subPropertyOf      myOnt:oilTemperature ;
  iso15926-x:domain_of_variation [ iso15926-2:temporal_part_of :M_101 ] ;
  iso15926-x:variation_during
     [ iso15926-x:nominal_value [ iso15926-x:utc_iso8601 "2007-12-31T11:15" ] ] ]
]
     a  :Mill_type_ABC_OilTemperatureHigh .

Oil_temperature_for_mill_M-101_during_2007-12-31_message-2

[ a                       iso15926-x:time_variation_of_property ;
  rdfs:subPropertyOf      myOnt:oilTemperature ;
  iso15926-x:domain_of_variation
       [ iso15926-2:temporal_part_of :M_101 ] ;
  iso15926-x:variation_during
       [ iso15926-x:nominal_value [ iso15926-x:utc_iso8601 "2007-12-31T22:50" ] ] ]
]
     a  :Mill_type_ABC_OilTemperatureHighHigh .

These messages record:

the observed object - M_101;
what is observed - myOnt:oilTemperature;
the time of observation - 2007-12-31T11:15 or 2007-12-31T22:50;
the observed feature - Mill_type_ABC_OilTemperatureHigh or Mill_type_ABC_OilTemperatureHighHigh.

The messages could be sent by e-mail, published on the Web within journal file, or processed by a dedicated system. On a journal file, the provenance of a message could be recorded as follows:

:Monitor_oil_temperature_for_mill_M-101_during_2007-12-31
   iso15926-x:creates_formula
       :Oil_temperature_for_mill_M-101_during_2007-12-31_message-1
{
[ a                       iso15926-x:time_variation_of_property ;
  rdfs:subPropertyOf      myOnt:oilTemperature ;
  iso15926-x:domain_of_variation
       [ iso15926-2:temporal_part_of :M_101 ] ;
  iso15926-x:variation_during
       [ iso15926-x:nominal_value [ iso15926-x:utc_iso8601 "2007-12-31T11:15" ] ] ]
]
     a  :Mill_type_ABC_OilTemperatureHigh
} .

4.6.2 Ontology for monitoring activities

4.6.2.1 monitoring_activity

An object is a monitoring_activity if and only if:

it is an iso15926-2:activity;
it issues a message whenever a part of a time_variation_of_property is detected which is a member of one of a set of specified monitoring criteria classes.

NOTE 1 The monitored time_variation_of_property for a monitoring_activity is specified by a monitors property.

NOTE 2 An input signal for a monitoring_activity is specified by a reads_record property.

NOTE 3 The set of monitoring criteria classes for a monitoring_Activity is specified by a has_monitoring_criteria_set property.

NOTE 4 A monitoring_activity can receive an input signal from a different measuring_activity. Alternatively a monitoring_activity can also measure, in which case it is also classified as a measuring_activity.

NOTE 5 An output message formula, content or record for a monitoring_activity can be recorded by a gives_monitoring_formula, gives_monitoring_content, or gives_monitoring_record property.

NOTE 6 OWL specification:

-->
<owl:Class rdf:about="&iso15926-x;monitoring_activity">
 <rdfs:subClassOf rdf:resource="&iso15926-2;activity"/>
 <rdfs:isDefinedBy rdf:resource="&iso15926-x-doc;/monitoring_activity.htm#monitoring_activity"/>
</owl:Class>
<!--

4.6.2.2 monitors

An object is a monitors relationship if and only if:

it is a basics:mapping between monitoring_activity and time_variation_of_property;
it specifies that a monitoring_activity looks for parts of a time_variation_of_property that are members of specified monitoring criteria classes.

NOTE OWL specification:

-->
<owl:ObjectProperty rdf:about="&iso15926-x;monitors">
 <rdfs:domain rdf:resource="&iso15926-x;monitoring_activity"/>
 <rdfs:range rdf:resource="&iso15926-x;time_variation_of_property"/>
 <rdfs:isDefinedBy rdf:resource="&iso15926-x-doc;/monitoring_activity.htm#monitors"/>
</owl:ObjectProperty>
<!--

4.6.2.3 has_monitoring_criteria_set

An object is a has_monitoring_criteria_set relationship if and only if:

it is a basics:mapping between monitoring_activity and a set of subclasses of time_variation_of_property;
it specifies that a monitoring_activity looks for parts of a time_variation_of_property which are members one of the set.

NOTE 1 The domain of has_monitoring_criteria_set is the powerset of the powerset of time_variation_of_property. This is inconvenient, but inescapable.

NOTE 2 OWL specification:

-->
<owl:ObjectProperty rdf:about="&iso15926-x;has_monitoring_criteria_set">
 <rdfs:domain rdf:resource="&iso15926-x;monitoring_activity"/>
 <rdfs:range rdf:resource="&iso15926-x;class_of_class_of_time_variation_of_property"/>
 <rdfs:isDefinedBy rdf:resource="&iso15926-x-doc;/monitoring_activity.htm#has_monitoring_criteria_set"/>
</owl:ObjectProperty>
<!--

4.6.2.4 gives_monitoring_formula

An object is a gives_monitoring_formula relationship if and only if:

it is a basics:mapping between monitoring_activity and formula;
the formula is about parts of the monitored time_variation_of_property that meet the monitoring criteria and that have been detected by the monitoring_activity.

The relationship gives_monitoring_formula is a specialisation of creates_formula.

NOTE OWL specification:

-->
<owl:ObjectProperty rdf:about="&iso15926-x;gives_monitoring_formula">
 <rdfs:domain rdf:resource="&iso15926-x;monitoring_activity"/>
 <rdfs:range rdf:resource="&iso15926-x;formula"/>
 <rdfs:subPropertyOf rdf:resource="&iso15926-x;creates_formula"/>
 <rdfs:isDefinedBy rdf:resource="&iso15926-x-doc;/monitoring_activity.htm#gives_monitoring_formula"/>
</owl:ObjectProperty>
<!--

4.6.2.5 gives_monitoring_content

An object is a gives_monitoring_content relationship if and only if:

it is a basics:mapping between monitoring_activity and information_content;
the information_content is about parts of the monitored time_variation_of_property that meet the monitoring criteria and that have been detected by the monitoring_activity.

The relationship gives_monitoring_content is a specialisation of creates_content.

NOTE OWL specification:

-->
<owl:ObjectProperty rdf:about="&iso15926-x;gives_monitoring_content">
 <rdfs:domain rdf:resource="&iso15926-x;monitoring_activity"/>
 <rdfs:range rdf:resource="&iso15926-x;information_content"/>
 <rdfs:subPropertyOf rdf:resource="&iso15926-x;creates_content"/>
 <rdfs:isDefinedBy rdf:resource="&iso15926-x-doc;/monitoring_activity.htm#gives_monitoring_content"/>
</owl:ObjectProperty>
<!--

4.6.2.6 gives_monitoring_record

An object is a gives_monitoring_record relationship if and only if:

it is a basics:mapping between monitoring_activity and information_carrier;
the information_carrier has contents about parts of the monitored time_variation_of_property that meet the monitoring criteria and that have been detected by the monitoring_activity.

The relationship gives_monitoring_record is a specialisation of creates_record.

NOTE OWL specification:

-->
<owl:ObjectProperty rdf:about="&iso15926-x;gives_monitoring_record">
 <rdfs:domain rdf:resource="&iso15926-x;monitoring_activity"/>
 <rdfs:range rdf:resource="&iso15926-x;information_carrier"/>
 <rdfs:subPropertyOf rdf:resource="&iso15926-x;creates_record"/>
 <rdfs:isDefinedBy rdf:resource="&iso15926-x-doc;/monitoring_activity.htm#gives_monitoring_record"/>
</owl:ObjectProperty>
<!--