Machine:Naming System

From .:: Wiki-Sirius ::.
Jump to: navigation, search


In the sections below the naming convention for Sirius is defined. It should be used to name device types, signals (properties) and machine slots. Moreover, the infrastructure of EPICS support applications that should be used to help managing lists of named objects for Sirius is described.

The Naming service and other support services can be accessed through the EPICS Support Applications menu

The wiki page for the outdated previous naming convention can be accessed here

PV Naming Specification

SIRIUS naming convention.png

PV Name


Area    | sec    :(=Section)    Accelerator Section comprising the machine (e.g, Storage Ring, Booster, Linac, Transport Lines, etc)
        | sub    :(=Subsection) Accelerator Subsection within a specific Section (e.g., First Sector, 
                                First Chromatic Section = 01C1, 02C2, 01M2, 01M1, etc)

Device  | dis    :(=Discipline) Branch of knowledge indicating the context in which a device is used (e.g, VAC, DIG, etc)
        | dev    :(=Device)     Physical device or indirect controlled device (needs to be unique only inside the same Discipline) 
                                (e.g., BPM, PS, Shaker, BBB, temperature sensor, fan, etc)
        | idx    :(=Index)      Distinsgish between same Devices in the same Subsection and Discipline (e.g., 010, 020, 1, 2, 3, R1C2, etc).

PField  | propty :(=Property)   A particular property of the accelerator system (e.g., Current, Position, Temperature).
        | field  :(=Field)      A particular attribute of the property (an EPICS record field).



(From ESS naming convention and DISCS Collaboration:

From the operational point of view it is beneficial to have names mentally linked to functional area. This would help physicists, operators, technicians and engineers to orient themselves on the site relative to named technical systems. Devices and signals are therefore sorted under a functional area structure in three levels:

  • Level 1. Super Section: Not part of the naming convention.
  • Level 2. Section (Sec)
  • Level 3. Subsection (Sub)


Any equipment that serves a particular function and is connected to the Control System is modelled as a device.

  • A Device name can represent Single piece of equipment, e.g. a temperature transmitter with only one signal.
  • Complex module of components, named devices and a local control system. Examples: Klystron modulators.
  • Indirectly controlled equipment, (e.g., a quadrupole magnet with the gradient field calculated from the settings and readouts from the connected power supply).

Devices can resided inside other devices, however the parent child relation cannot be resolved from the names. The hierarchy can instead be found in the configuration database or in other systems where the names are used.

  • Level 1. Discipline (Dis)
  • Level 2. Category: Not part of the naming convention.
  • Level 3. Device Type (Dev)


Naming convention users prefer to use generic device type as device identifier in names. Essential for configuration of the control system is however the specific device type, which in principle could be viewed as the fourth level in the device structure. In difference to items in the device structure, which are managed in the Naming Service, the specific device types and signal part of names are handled by integrators in the IOC Factory. The specific device types and the signal part are therefore sorted under a separate configuration structure:

  • Level 1 Specific Device Type: Not part of the naming convention.
  • Level 2 Property (Property)
  • Level 3 Field (FIELD)

Naming Rules

R01 Instance index (Idx) shall be alphanumeric. I.e., only upper and lower case alphanumeric characters (a-z, A-Z, 0-9) are allowed.
R02 The device names Sec-Sub:Dis-Dev-Idx shall be distinguishable, which means that names shall be unique irrespective of:
Letter case
Letters I, l and number 1
Letter O and number 0
Letters V and W
Leading zeros, i.e., number 0 immediately following a non-numerical character
R03 The maximum length of instance index (Idx) is 6 characters.
R04 Properties like temperature, current, voltage etc., will be used for many different device types.
Therefore, the signal property shall follow the LNLS Signal-Property Standard. Users of the naming
convention are strongly encouraged to update this list.
R05 A signal, which is intended only for debugging or for other private purposes, shall include a lowercase i as prefix (iProperty).
R06 To distinguish identical signals of the same device, suffices shall be appended to the property as
PropertySuffix. Users shall refer to the LNLS Signal-Property Standard, where common suffices are listed,
before inventing new ones for standard types such as read (Rd) and set (Set).
R07 Units must not be entered in the names. The record field for engineering units (EGU) handles this.
R08 Each part of the PV name must have the following number of characters:
Sec >= 1 && Sec <= 6
Sub >= 1 && Sub <= 6
Dis >= 1 && Dis <= 6
Dev >= 1 && Dev <= 12
Idx >= 0 && Idx <= 12
Prop >= 1
R09 Characters '-' (dash), '.' (dot) and ':' (colon) are reserved and should not be used in Sec, Sub, Dis, Dev, Idx, Property or FIELD fields. The exception to this rule is in the use of suffixes, as defined by table Suffixes Table

Abbreviation Tables

Device Names

Table 1: Device Names Table.
Abbreviation Device Name
AccStr Accelerating Structure
Amp Amplifier
Anode Anode
B Bending magnet/Dipole
BakJ Bakeout heating jackets
BE Back-End
BLM Beam Loss Monitor
Blw Non-RF bellows
BlwRF RF shielded bellows
BMPS Bending Magnet Photon Shutter
BPM Beam Position Monitor
Brd Board
Bun Buncher
Cam Camera
CCG Cold cathode vacuum gauge
CH Horizontal Corrector Magnet
Corr Corrector/Correction
CRL Compound Refractive Lens
CV Vertical Corrector Magnet
DCCT Direct Current Current Transformer
Detec Detector
Dig Digitizer
Distrib Distributor/Distribution
Door Door
EBeam Electron beam
EjeKckr Ejection Kicker
EjeSeptF Ejection Thin Septum
EjeSeptG Ejection Thick Septum
APU Adjustable Phase Undulator
EPU Elliptically Polarizing Undulator
FBE Front/Back-End
FCH Horizontal Fast Corrector Magnet
FCT Fast Current Transformer
FE Front-End
FOFB Fast Orbit Feedback
Fout Fanout
EGun Electron gun
GV Gate valve (may be used for FE and
H Horizontal
Hyb Hybrid
ICT Integrating Current Transformer
InjDpKckr Injection Dipolar Kicker
InjKckr Injection Kicker
InjNLKckr Injection Non-Linear Kicker
InjSept Injection Septum
InjSeptF Injection Thin Septum
InjSeptG Injection Thick Septum
IP Sputter Ion Pump
IPC Ion Pump Controller
IVU In-Vacuum Undulator
Kly Klystron
Mark Placeholder position for calculations
Modltr Modulator
Mtr Motor
Mpole Multipole
NEG Non-evaporable getter pump
NEGC NEG pump controller
NetSw Network Switch
Pkup Pickup
Panel HMI Panel
PLC Programmable Logic Controller
PRV Pressure relief valve
PS Power supply
QD Defocusing Quadrupole
QF Focusing Quadrupole
QN Normal Quadrupole
QS Skew Quadrupole
RGA Residual gas analyzer / partial
Shkr Shaker
SHB Sub-Harmonic Buncher
Scan Scan (for experiment control)
Scrap Scraper
ScrapH Horizontal Scraper
ScrapV Vertical Scraper
Scrn Screen monitor
Slnd Solenoid
SD Defocusing Sextupole magnet
SF Focusing Sextupole magnet
Sx Sextupole magnet
SOFB Slow Orbit Feedback
StrkCam Streak Camera
TCU Temperature Compensating Unit
TCG Thermal conductivity vacuum gauge
TMP Turbomolecular pump
TSP Titanium sublimation pump
TSPC Titanium sublimation pump
TSrv Terminal server
V Vertical
VF Visual Flag
VFD Variable Frequency Drive
VGC Vacuum gauge controller
UPS Uninterruptible Power Supply

Property Names

Table 2: Properties Table.
Abbreviation Property Name
Addr Address
Alrm Alarm
Alpha Alpha (physics calc)
Ampl Amplitude
Beta Beta (physics calc)
Beam Beam
Btn Button
Bw Bandwidth
Chan Channel
Clk Clock
Cmd Command
Cnt Count
Ctrl Control
Cyc Cyclic
Delay Delay
DI Digital input
Dir Direction
Div Divider
DO Digital output
Dose Accumulated Radiation Dose
Dsbl Disable
Dur Duration
Eff Efficiency
Emit Emittance (physics calc)
Enbl Enable
EStop Emergency Stop
EU Engineering Units
Evt Event
Excit Excitation
Fld Field (magnetic)
Flt Fault
Fluor Fluorescent
Freq Frequency
Fxd Fixed
Gen Generator
HwFlt Hardware fault
Intvl Interval
ID Indentifier (e.g. serial number)
In Input (e.g., from PLC)
Incr Increment / Incremented
Ind Indicator (e.g. lamp, light, LED)
Inh Inhibit
Intlk Interlock
Lvl Level
Lk Lock
Lim Limit
Mark Mark (position indicatore)
Mig Migration
Mode Mode
Mon Monitor
Mult Mult
Offset Offset
Out Output (e.g., from PLC)
P Pressure
Permit Permit
Phs Phase
Pol Polarity
Pos Position
Pt Point
Pulse Pulse
Pwr Power
Rdy Ready
Rmp Ramp
Rx Receiver
RB Readback
Req Request
Res Resolution
RH Relative humidity
ROI Region of interest
Rslt Result
Rslv Resolver
Rsrv Reserved
Rst Reset
S Speed
Seq Sequence
SP Setpoint
Src Source
Sgl Single
Sig Signal
Siren Alarm siren
Size Size
Slope Slope
Slot Slot
Step Step
Sw Switch
T Temperature
Tbl Table
Time Time
Ts Time interval
Tx Transmitter
Trig Trigger
Trip Interlock trip
Type Type (of device)
Undo Undo
Volt Voltage
W Weight or Force
Wfm Waveform
X Horizontal
Y Vertical
Z Longitudinal
Property Domains (suffixes)

Table 3: Suffixes for non Setpoint/Readback device properties.
Suffix Read/Write Description
-Cte read Constant device property variable
-Cmd write Variable to issue a momentary binary digital command to the device
-Sel write/read Enumerated device property setpoint variable
-Sts read Enumerated device property readback variable
-SP write/read Non-enumerated device property setpoint variable
-RB read Non-enumerated device property readback variable
-Mon read Monitor non-enumerated or enumerated device property variable

General Names

Table 4: General Table.
Abbreviation Name
Acc Accelerator
Avg Average/Averaging
BbB bunch-by-bunch
Dev Device
Eje Ejection/Extraction
Err Error
Fam Family
Fib Optical Fiber
Filt Filter
Glob Global
Hw Hardware
Img Image
Inj Injection
Integ Integrated
Kicker Kicker
Mat Matrix
MultB Multi bunch
Nr Number
Op Operation
Ref Reference
Resp Response
Ser Serial
SingB Single bunch
Spl Sample(s)/Sampling
Struct Structure
Strth Strength
Tot Total
Tr Transfer
Thold Threshold


  • Device names should use index suffixes (-H/-V) to differentiate between two equal devices (e.g., TuneAmp-H/TuneAmp-V). The exception to this guideline should be only for historical reasons, such as horizontal/vertical correctors that use H/V as prefixes (e.g., CH/CV).
  • Properties should use X/Y sufixes without "-" (e.g., MonitX/MonitY) for X and Y directions.

Examples of PV Names

01) SI-Glob:AP-SOFB:Mode-Sel
02) SI-13SA:DI-TuneSh:ExcAmp

03) SI-Glob:AP-TuneM:TuneX-Mon

04) SI-01M2:DI-BPM:PosX-Mon
05) SI-02M1:PS-QFB:Current-SP

06) LI-01:TI-STDMOE:TrigDelayCh01 (sending signal to LI-01:EG-EGun)

07) SI-Fam:PS-B1B2-1:Current-RB
08) SI-13SA:DI-DCCT:BbBCurrent-Mon
09) SI-01SA:TI-SOE:TrigDelayCh02 (sending signal to SI-01SA:PU-InjDpK)

ABNF grammar for PV naming

; ABNF grammar (conforming to
; for LNLS EPICS naming convention, candidate 2

PV-Name            = area device record field

area               = sec inner-separator sub group-separator

; Section can only be one of the options listed and approved below

; The following may not work on all parsers. So, the traditional decimal
; coding is used.
; sec                = ( %s"AS" "SI" / %s"BO" / %s"LI" / %s"TS" / %s"TB" / %s"BL" / %s"UT" )
sec                = ( %d83.73 / %d66.79 / %d76.73 / %d84.83 / %d84.66 / %d66.76 / %d85.84 )
sub                = sub-code

; combination of numbers and letters (e.g., C1, C2, M1, M2, etc)
sub-code           = 1*6alpha-num

; device definition with optional index
device             = dis inner-separator dev opt-idx group-separator

opt-idx            = ( inner-separator idx ) / ""

; Discipline can only be one of the options listed and approved below

; The following may not work on all parsers. So, the traditional decimal
; coding is used.
; dis                = ( %s"MA" / %s"DI" / %s"PS" / %s"VA" / %s"RF" / %s"CO" / %s"TI" / %s"PU" / %s"PM" / %s"EP" / %s"PP" / %s"AP" / %s"ID" / %s"MS" / %s"EG" / %s"MO" )
dis                = ( %d77.65 / %d68.73 / %d80.83 / %d86.65 / %d82.70 / %d67.79 / %d84.73 / %d80.85 / %d80.77 / %d69.80 / %d80.80 / %d80.65 / %d73.68 / %d77.83 / %d69.71 / %d77.79 )
dev                = 1*12letter
idx                = 1*6alpha-num

; the field is just optional so we can check for the validity of the PV name,
; but the field is always present on regular EPICS IOCs
record             = 1*15alpha-num opt-suffix

opt-suffix         = ( suffix-separator record-suffix ) / ""
record-suffix      = 1*letter

field              = ( record-separator epics-field ) / ""

; EPICS record fields
epics-field        = 1*30letter-upper

; alphanumeric
alpha-num          = ( digit / letter )

; letter
letter             = letter-lower / letter-upper

; letter lowercase
letter-lower       = ALPHA-LOWER

; letter uppercase
letter-upper       = ALPHA-UPPER

; 1 or more digits
number             = 1*DIGIT

; 1 or more letters
word               = 1*ALPHA

; regular digit
digit              = %x30-39

; regular character a-z A-Z
ALPHA-LOWER    =  %x41-5A
ALPHA-UPPER    =  %x61-7A

; separators
inner-separator    = "-"
suffix-separator   = "-"
group-separator    = ":"
record-separator   = "."

Drawings with Names of Lattice Elements

Links bellow point to drawings with family names of lattice elements for each accelerator section