Industrial-process measurement and control — Data structures and elements in process equipment catalogues Part 13: Lists of properties LOP for Pressure Measuring Equipment for electronic
General
For the purposes of this document, the terms and definitions given in IEC 61987-10 and IEC 61987-11, as well as the following apply.
Terms relating to measuring range
3.2.1 measuring range range defined by two values of the measurand, or quantity to be supplied, within which the limits of uncertainty of the measuring instrument are specified
Note 1 to entry: The measuring range is defined by two values, the lower range limit (LRL) and the upper range limit (URL)
A device that can be adjusted to measure intervals within a specified range or provides fixed sub-ranges is defined by two key values: the lower range-end value (LRV) and the upper range-end value (URV).
[SOURCE: IEC 60050-311, 311-03-12, modified (notes added)]
3.2.2 span algebraic difference between the upper and lower end values of the set measuring range
When a device is configured to measure within a defined range, the span is determined by the algebraic difference between the upper and lower range limits, commonly referred to as the maximum span.
[SOURCE: IEC 60050-311, 311-03-13 modified (“set” and note added)]
3.2.3 turndown ratio ratio of the maximum span to the set span
3.2.4 zero adjustment maximum value by which a pressure measurement can be offset to provide a reading of zero on an output
Terms relating to performance
The influence of alternating bilateral overpressure on the maximum deviation of zero pressure readings is examined by applying the maximum positive and then the maximum negative allowed overpressure to both sides of a differential pressure transmitter at a reference temperature.
The influence of alternating unilateral overpressure on the maximum deviation of zero pressure readings is examined by applying the maximum positive and then the maximum negative allowed overpressure to one side of a differential pressure transmitter at a reference temperature.
3.3.3 influence of ambient temperature for a pressure transmitter, combined influence on zero and span caused by a change in ambient temperature over a given range, expressed as percentage of URL
Note 1 to entry: Manufacturers of pressure transmitters currently express this influence in one of two ways: – a change in ambient temperature over the range of –10 °C to + 60 °C,
– a change in ambient temperature of + 28 °C (+ 82,5 °F) with respect to reference ambient temperature
Note 2 to entry: The corresponding properties are to be found in the CDD2
3.3.4 influence of static pressure on span influence of static pressure applied on both sides of a differential pressure meter on span per given pressure interval
Note 1 to entry: Manufacturers of pressure transmitters currently express this influence in one of two ways: – per 100 bar,
Note 2 to entry: The corresponding properties are to be found in the CDD
3.3.5 influence of static pressure on zero influence of static pressure applied on both sides of a differential pressure meter on zero per given pressure interval
Note 1 to entry: Manufacturers of pressure transmitters currently express this influence in one of two ways: – per 100 bar,
Note 2 to entry: The corresponding properties are to be found in the CDD
Non-conformity refers to the deviation from ideal behavior in devices exhibiting a non-linear input/output relationship This deviation is assessed by analyzing the curve derived from the overall average of corresponding upscale and downscale errors.
Note 1 to entry: Non-conformity can be calculated and expressed in one of three ways:
– independent: line positioned so as to minimize the maximum deviation,
– terminal-based: line positioned so as to coincide with the actual characteristic curve at the upper and lower range values,
Zero-based refers to a line that is aligned with the actual characteristic curve at its lower range value Relevant properties can be found in the CDD.
3.3.7 non-linearity deviation from ideal behaviour for devices that have a linear input/out relationship, determined from the curve plotted using the overall average of corresponding upscale and downscale errors
Note 1 to entry: Non-linearity can be calculated and expressed in one of three ways:
– independent: line positioned so as to minimize the maximum deviation,
– terminal-based: line positioned so as to coincide with the actual characteristic curve at the upper and lower range-values,
A zero-based line is aligned to match the actual characteristic curve at its lower range value Relevant properties can be found in the CDD.
3.3.8 span error difference between the actual span and the maximum span when the input is at the upper range limit, expressed as percentage of maximum span
The span error for the bilateral application of static pressure refers to the discrepancy between the actual span and the maximum span, expressed as a percentage of the maximum span This occurs when identical static pressure is applied to both sides of a differential pressure transmitter.
3.3.10 total error sum of the total performance and the long term drift per annum, expressed as percentage of span
Note 1 to entry: Manufacturers currently express total performance in several different ways, see notes to 3.3.11 Note 2 to entry: The corresponding properties are to be found in the CDD
3.3.11 total performance square root of (non-linearity)² + (influence of ambient temperature)² + (influence of static pressure on span)², expressed as percentage of span
Manufacturers of pressure transmitters typically quantify total performance in two ways: first, by measuring changes in ambient temperature from –10 °C to +60 °C alongside static pressure per 100 bar; and second, by assessing changes in ambient temperature of ±28 °C (±82.5 °F) relative to a reference temperature, with static pressure measured at 69 bar (1,000 psi).
Some manufacturers incorporate the effects of static pressure on zero and the influence of overpressure up to the rated pressure on span into their total performance calculations.
Note 3 to entry: The corresponding properties are to be found in the CDD
3.3.12 zero point error absolute error of a device under reference conditions, when the input is at the lower range limit
3.3.13 zero point error for bilateral application of static pressure deviation of pressure reading from zero when the same static pressure is applied on both sides of a differential pressure transmitter
Overview
This document outlines the LOPs designed for electronic data exchange processes between two computer systems, which may either be part of the same company or belong to different companies, as specified in Annex C of IEC 61987-10:2009.
The OLOP for pressure measuring equipment is detailed in Annex A, while the DLOPs for each specific type of pressure device are outlined in Annex B.
The structural elements, including LOP type, block, and property, outlined in this standard, are accessible in electronic format within the "Process Automation" section of the IEC Common Data Dictionary (CDD).
Depiction of OLOPs and DLOPs
General
The properties of OLOPs and DLOPs outlined in IEC 61987 are developed in accordance with the IEC 61360 series requirements Consequently, the structural elements, properties, and attributes included in the IEC Common Data Dictionary are considered normative.
Structural roles
The entities within a list of properties can have one of a number of structural roles a) Property
A property exists as a property only b) Ref property + Block
A reference property connects a block to the superordinate block or LOP in which it is embedded
In a structured layout, properties and sub-blocks that are aligned one position to the right of a block name are considered elements of that block The definition of a block concludes when a new block name is introduced in the same column or in any column to the left of the original block name.
The reference property shares its preferred name with the corresponding block it denotes All attributes related to these properties can be found in the IEC Common Data Dictionary (CDD) Additionally, the cardinality property is also included.
A cardinality property is linked to the subsequent block, and the value of this property (ranging from 0 to n) in a transaction file specifies how many times the related block will be repeated.
The preferred name of a cardinality property is with “Number of “ where is derived from the name of the block with which it is associated
In the transaction file (see examples in 4.3), it can be seen that a block has been repeated twice:
• the cardinality property directly before the block has a value greater than 1,
• the name of the repeated block is extended by “_” followed by the repetition number
If the block “Signal function” should be repeated 3 times, the following construction should occur in the transaction file:
“number of signal function” has the value “3” cardinality property
“Signal function_1” first repeated block
“Signal function_2” second repeated block “Signal function_3”t hird repeated block d) Polymorphic control property
A polymorphic control property allows for the integration of complete blocks that define various realizations of a specific device function, such as inputs and outputs This property includes a value list that specifies the designations of the blocks that can be introduced When a value is assigned to a polymorphic control property in a transaction file, the corresponding block is activated The preferred naming convention for a polymorphic property is “ type,” where typically derives from the name of the associated block Additionally, a polymorphic control property can have a fixed value represented as “.”
This property is located directly behind the polymorphic block property and is identical to the polymorphic control property for the block, utilizing the fixed value used to create the block, as outlined in IEC 61987-10.
Marking of polymorphic areas
To identify potential polymorphic blocks in the printable version of this standard, a number with a grey background can be added to the rightmost column of the DLOP, indicating the properties linked to the block It's important to note that in the transaction file, only the polymorphic block selected from the value list of the polymorphic control property will be displayed in the superordinate block.
Figure 1 – Structure of a polymorphic area
A polymorphic area is defined by a block, as illustrated in Figure 1 It starts with the block's name, which may be accompanied by additional properties or sub-blocks that are applicable to all alternative sub-blocks generated by polymorphism Following this, a polymorphic control property is introduced to select one of the alternative blocks The alternative sub-blocks, along with their respective properties and sub-blocks, are then enumerated The polymorphic area concludes with the final property of the last selectable sub-block, determined by the value list of the polymorphic control property.
To enhance the analysis of LOPs, a non-normative numerical marking system can be employed This system allows for polymorphic areas to contain one or more subordinate polymorphic areas As illustrated in Table 1, each polymorphic area is assigned a unique number, reflecting their sequence within the LOP rather than their structural hierarchy Consequently, an embedded area will have a marking number that exceeds that of the area it resides in.
The "Output" block primarily derives its content from the polymorphic area labeled with the number 8, beginning with "Type of output." This section can encompass various specializations, each also indicated by the number 8 Additionally, each specialization features its own polymorphic area, referred to as "Assigned variable," which is marked by a number greater than 8.
Block Name (for alternative case 1)
Block Name (for alternative case 2)
Block Name (for alternative case n)
Name of the polymorphic control property (which has a value list consisting of exactly n values)
Block Name (containing a polymorphic area)
(of the common part, valid for all alternative cases)
Table 1 highlights the missing marking numbers 3 to 7 utilized in DLOPs for flow measuring equipment, as referenced in IEC 61987-12 3 Additionally, the polymorphic areas identified by numbers 9, 10, 11, 13, and 14 are contained within the larger polymorphic area designated by number 8.
Table 1 – Example of structure of polymorphic areas in the DLOPs
Block name Marking number of 1 st level polymorphic area
Marking number of nested polymorphic area (2 nd level)
In the OLOP for pressure measuring equipment, there are two polymorphic areas without nested sub-areas Table 2 shows in which blocks they appear
Table 2 – Example of structure of polymorphic areas in the OLOP
Block name Marking number of 1 st level polymorphic area
High/single pressure side process case variables
Low pressure side process case variables
In order to make clear how the structural elements such as block, cardinality and polymorphism can be implemented using the LOPs of this standard some examples are provided in 4.3.
Examples of DLOP block usage
Block “Digital communication”
The pressure transmitter features a FOUNDATION fieldbus interface and is intended for safe area applications, complete with a plug connector It includes multiple function blocks and can be configured as a LAS device if necessary The configuration of the “Digital Communication” block is detailed in Table 3, with some properties left unused.
Table 3 – Example for “Digital Communication”
Name of LOP type, block or property4 Assigned value Unit
Digital communication number of digital communication interfaces 1
Digital communication interface designation of digital communication interface FOUNDATION fieldbus
Communication protocol type of protocol FOUNDATION fieldbus H1 device class Basic device
LAS functionality Yes assigned LAS functionality Disabled number of communication variables 2
Communication variable_1 designation of digital communication channel CHANNEL_1 assigned variable Pressure type of communication variable Analog input
Communication variable_2 designation of digital communication channel CHANNEL_2
4 In the CDD, block names start with a capital letter, property names with a lower case letter
Name of LOP type, block or property4 Assigned value Unit assigned variable Process temperature type of communication variable Analog input
Physical layer type of physical layer IEC 61158-2 number of baud rate settings 1
Baud rate setting supported baudrate 31,25 kBit/s number of wired communication interfaces 1
Electrical data of a bus powered device base current 15 mA fault current ≤ 9 mA start-up current 16 mA
Electrical data for passive behaviour rated voltage 24 V- minimum voltage 9 V- maximum voltage 36 V- number of galvanic isolations
Galvanic isolation galvanic isolation of electrical circuits Power, input, output
Line monitoring reverse polarity protection Yes short-circuit monitoring Yes lead breakage monitoring Yes
Connector type of connector 7/8 – 16 UNC style of connector Female number of device integrations 2
Device integration_1 type of device driver EDD version of device driver 1.00
Device integration_2 type of device driver CFF version of device driver 1.00
Fieldbus parameters number of function blocks 4
The function block_1 is an enhanced analog input type, consisting of two function blocks with an execution time of 45 ms Notably, it includes digital outputs for process alarms and a fail-safe mode, ensuring improved functionality and safety.
Name of LOP type, block or property4 Assigned value Unit
Function block_2 type of function block PID quantity of function blocks 1 execution time of function block 120 ms style of function block standard
Function block_3 type of function block Input selector quantity of function blocks 1 execution time of function block 35 ms style of function block standard
The function block_4 is a cascade signal characterizer with a single instance and an execution time of 35 ms It is manufacturer-specific in style and features enhancements such as 51 pivot points, allowing for cascading to create larger strapping tables The block supports 44 virtual communication relationships (VCRs) and offers various calibration methods for pressure and level Additionally, it has the capability for block instantiation, with a maximum of 15 instances allowed.
Sub-block “Dial indicator”
A pressure gauge designed for use in a safe area has a dial indicator with trip switches The
The "Dial indicator" sub-block within the "Mechanical and Electrical Construction" section can be configured as detailed in Table 4, with certain properties indicated as unused.
Table 4 – Example for “Dial indicator”
Name of LOP type, block or property5 Assigned value Unit
Dial indicator type of dial indicator Dial and pointer with electrical contact mounting location Direct mounting, back entry
Case nominal size of case 108 mm depth 62 mm
Material of case designation of material Stainless steel
5 In the CDD, block names start with a capital letter, property names with a lower case letter
The article discusses the specifications of a particular LOP type, detailing its assigned value and material codes The window is made of safety glass, while the movement components are constructed from stainless steel It has a degree of protection rated at IP 54 and falls under enclosure type no/class Type 3, adhering to the NEMA reference standard There are no special mounting methods or conditions required for this setup.
The scale range for this positive pressure gauge spans from 0 to 250 mbar, with an interval of 2.5 mbar The scale arc measures 120°, and the dial markings are in black.
The scale range is designed for positive pressure, with a lower end value of 0 and an upper end value of 100 It features a scale interval of 1 and a scale arc of 120° The dial is made of aluminum, marked in black, and has a white background with no illumination There are no specified revolution values or display foreground colors, and the number of pointers is not indicated.
Pointer 1 material of pointer Aluminium style of pointer Mark pointer pointer position Centre pointer adjustment Screw zero and span adjustment Two screws colour of display illumination No illumination
Contacts quantity of contacts 2 electrical contact adjustment Set hand style of contact reset Automatic decreasing
Name of LOP type, block or property5 Assigned value Unit trip point hysteresis 5 % type of switch dead band Fixed number of connection facilities 1
The connection facility is designated as N/A and is mounted on the right side of the case It features a junction box for signal termination and requires a user-supplied wire device extension There is a total of one connection compartment available.
The connection compartment features a weatherproof design with an IP 65 degree of protection and is classified as Type 4X according to NEMA standards Constructed from black PA 16 nylon, it includes seven solder tag terminals made of brass with a tin-plated finish The maximum core cross-section is 2.5 mm², and it accommodates multiple cable or conduit entries.
Cable/conduit entry 1 quantity of cable/conduit entries 1 nominal size of cable/conduit entry M20x1.5
Operating list of properties for pressure measuring equipment
The OLOP has been developed for various types of pressure measuring equipment and is categorized into three distinct areas within the classification scheme for process measuring equipment, as outlined in Table A.1 of IEC 61987-11:2012.
NOTE The OLOP is also to be found in the Properties Tree field and has the ID IEC-ABA026
The OLOP is available with all blocks and properties in the IEC CDD at: http://std.iec.ch/cdd/iec61987/cdddev.nsf/TreeFrameset?OpenFrameSet 6
Device lists of properties for pressure measuring equipment
Absolute/gauge pressure transmitter
The DLOPs of Annex B correspond to the classification scheme for measuring equipment placed in Annex A of IEC 61987-11:2012 7
The DLOP for an absolute pressure/gauge transmitter is assigned to two following nodes of the classification:
– absolute pressure transmitter IEC-ABA832
– gauge pressure transmitter IEC-ABA834
NOTE The DLOP is also to be found in the Properties Tree field and has the ID IEC-ABA029
The DLOP is available with all blocks and properties in the IEC CDD at: http://std.iec.ch/cdd/iec61987/cdddev.nsf/TreeFrameset?OpenFrameSet 8
Differential pressure transmitter
The DLOP for a differential pressure transmitter is assigned to the following node of the classification (Table A.1of IEC 61987-11:2012):
– differential pressure transmitter IEC-ABA833
NOTE The DLOP is also to be found in the Properties Tree field and has the ID IEC-ABA031
The DLOP is available with all blocks and properties in the IEC CDD at: http://std.iec.ch/cdd/iec61987/cdddev.nsf/TreeFrameset?OpenFrameSet 9
Absolute/gauge pressure gauge
The DLOP for an absolute pressure/gauge pressure gauge is assigned to two following nodes of the classification (Table A.1 of IEC 61987-11:2012):
– absolute pressure gauge IEC-ABA653
– gauge pressure gauge IEC-ABA662
NOTE The DLOP is also to be found in the Properties Tree field and has the ID IEC-ABA032
The DLOP is available with all blocks and properties in the IEC CDD at: http://std.iec.ch/cdd/iec61987/cdddev.nsf/TreeFrameset?OpenFrameSet 8
Differential pressure gauge
The DLOP for a differential pressure gauge is assigned to the following node of the classification (Table A.1 of IEC 61987-11:2012):
7 Manifold, Annex B 6 Is not in Annex A of IEC 61987-11:2012, but will be included in the next edition
– differential pressure gauge IEC-ABA655
NOTE The DLOP is also to be found in the Properties Tree field and has the ID IEC-ABA034
The DLOP is available with all blocks and properties in the IEC CDD at: http://std.iec.ch/cdd/iec61987/cdddev.nsf/TreeFrameset?OpenFrameSet 9
Remote seal
The DLOP for a remote seal is assigned to the following node of the classification (Table A.1 of IEC 61987-11:2012):
NOTE The DLOP is also to be found in the Properties Tree field and has the ID IEC-ABA035
The DLOP is available with all blocks and properties in the IEC CDD at: http://std.iec.ch/cdd/iec61987/cdddev.nsf/TreeFrameset?OpenFrameSet 9
Manifold
The DLOP for a manifold is assigned to the following node of the classification of CDD:
NOTE The DLOP is also to be found in the Properties Tree field and has the ID IEC-ABA037
The DLOP is available with all blocks and properties in the IEC CDD at http://std.iec.ch/cdd/iec61987/cdddev.nsf/TreeFrameset?OpenFrameSet 9
The properties utilized in the OLOP outlined in Annex A and the DLOPs detailed in Annex B can be accessed along with all their attributes in the IEC Common Data Dictionary (CDD) at the following link: [IEC CDD](http://std.iec.ch/cdd/iec61987/cdddev.nsf/TreeFrameset?OpenFrameSet).
Block library for considered device types
The blocks utilized in the OLOPs found in Annex A and the DLOPs in Annex B are accessible with all attributes in the IEC Common Data Dictionary (CDD) at the following link: [IEC CDD](http://std.iec.ch/cdd/iec61987/cdddev.nsf/TreeFrameset?OpenFrameSet).
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