Main and Sub-identifiers for Identifier Blocks

Within the project structure, identifier blocks have particular classification levels that allow a structure identifier to be divided into main and sub-identifiers. The sub-identifiers form a hierarchy with the corresponding main identifier. A sub-identifier is always assigned to a main identifier. Depending on the identifier block, different numbers of sub-identifiers can be used in EPLAN. Main and sub-identifiers are separated from each other by particular characters. The separators that may be used depend on the particular identifier block.

Classification of identifier blocks

Main identifier	Sub-identifier
Functional assignment (Preceding sign ==, # or ≠)	Classification level 1	Classification level 2
Identifies the functional relationship between higher-level functions, technical facilities, and devices.	Plants, plant sections, part sections, technical facilities, and devices	Master function and functional units

Main identifier

Sub-identifier

Functional assignment
(Preceding sign ==, # or ≠)

Classification level 1

Classification level 2

Identifies the functional relationship between higher-level functions, technical facilities, and devices.

Plants, plant sections, part sections, technical facilities, and devices

Master function and functional units

Main identifier	Sub-identifier
Function designation (Preceding sign =)	Classification level 1	Classification level 2	Classification level 3
Identifies higher-level functions, plant sections, and technical facilities	Plants, plant sections, and part sections	Technical facilities and devices	Further subgroupings

Main identifier

Sub-identifier

Function designation
(Preceding sign =)

Classification level 1

Classification level 2

Classification level 3

Identifies higher-level functions, plant sections, and technical facilities

Plants, plant sections, and part sections

Technical facilities and devices

Further subgroupings

Main identifier	Sub-identifier
Installation site (Preceding sign ++)	Classification level 1	Classification level 2
Identifies topographical installation sites	Building, hallway, floor, stage, etc.	Rooms and areas

Main identifier

Sub-identifier

Installation site
(Preceding sign ++)

Classification level 1

Classification level 2

Identifies topographical installation sites

Building, hallway, floor, stage, etc.

Rooms and areas

Main identifier	Sub-identifier
Location designation (Preceding sign +)	Classification level 1	Classification level 2	Classification level 3	Classification level 4	Classification level 5
Identifies the mounting location of devices	Construction units, panels, tables, enclosures, power units, etc.	Mounting location within the construction unit	Further Subclassification	Further Subclassification	Further Subclassification

Main identifier

Sub-identifier

Location designation
(Preceding sign +)

Classification level 1

Classification level 2

Classification level 3

Classification level 4

Classification level 5

Identifies the mounting location of devices

Construction units, panels, tables, enclosures, power units, etc.

Mounting location within the construction unit

Further Subclassification

Main identifier
Higher-level function number (user-defined prefix)
Specifies the number of the higher-level function if the fluid circuit in the project consists of more than one higher-level function.

Main identifier

Higher-level function number (user-defined prefix)

Specifies the number of the higher-level function if the fluid circuit in the project consists of more than one higher-level function.

Main identifier	Sub-identifier
Device (Preceding sign -)	Classification level 1
Identifies the device	Device

Main identifier

Sub-identifier

Device
(Preceding sign -)

Classification level 1

Identifies the device

Device

Main identifier	Sub-identifier
Document type (Preceding sign &)	Classification level 1	Classification level 2	Classification level 3
Identifies document types to distinguish them by the information content	Document type, e.g. schematic, system schematic, terminal diagram, table of contents	Requirements for the technical realization, for example transfer via bus, fixed wiring.	Further Subclassification

Main identifier

Sub-identifier

Document type
(Preceding sign &)

Classification level 1

Classification level 2

Classification level 3

Identifies document types to distinguish them by the information content

Document type, e.g. schematic, system schematic, terminal diagram, table of contents

Requirements for the technical realization, for example transfer via bus, fixed wiring.

Further Subclassification

Main identifier	Sub-identifier
User-defined (preceding sign user-defined / default #)	Classification level 1
User-defined identifier block	Further Subclassification

Main identifier

Sub-identifier

User-defined
(preceding sign user-defined /
default #)

Classification level 1

User-defined identifier block

Further Subclassification

Separators for defining sub-identifiers in identifier blocks

Identifier block	Separator for sub-identifiers
Functional assignment	== .
Function designation	= .
Installation site	++ .
Location designation	+ .
User-defined	User-defined (default #)