The system of classification and coding

When designing the automated process control system, it is necessary to be guided by the rules for the names of objects and variables, where each letter in the object name indicates a feature or function.

The rules for naming tags in the process control system allow saving a significant amount of time in the design and further maintenance of the facility.

Key technological position of the measured parameter as follows:

The letter at the first position is monitored parameter:

T – temperature;
P – pressure;
Pd – pressure difference;
L – level;
F – flow;
A – Analysis of the analyzer;
Q – gas content (concentration), the amount, characterized by quality;
S – state control solenoid shut-off valve;
I – current motor;
G – state control of technological units – the compressor;
N – state control of the technological unit – pump;
V – state process control unit – the fan;
Z – state control of technological units – elektrozadvizhka;
X – state control light display;
B – state control of the oven burner;
H – Manual exposure;

The letter at the second position is to change the measured value to describe the position of a functional feature:

E – sensor, the sensor;
I – indication of analog variable;
A – a sign of the input digital signal DCS system, alarm system;
S – a sign of the input signal ES system;
C – parameter control (including position);
Q – calculation of the total value of the parameter integration;
Y – Shaped by setting logical conditions;
V-adjusts the valve actuator terminal loop, a discrete process control unit;
T – a device endpoint measurement circuit.

The letter at the third position:

A – spetsgazozduvok system (6505);
B – system of accounting and registration (6506);
C – HVAC system (6509);
D – grouting system (6510);
E – extraction system (6520);
F – system of conditioned containers (6530);
G – a system of sub-standard containers (6540);
H – water supply system him.ochischenoy (6580);
I – the dry reagent system (6581);
J – system of hot water supply (6582);
K – the system chilled water supply (6583);
L – heating steam supply system (6584);
M – compressed air system (6585);
N – supply system of drinking water (6587);
O – System Control (6595);

The letter at the fourth position:

L – minimum value, a warning alarm;
H – the maximum value of the parameter, a warning alarm;
M – state elektrozadvizhki “jamming”;
S – the command “stop”;
R – the command “Start”;
O – open position, the opening of the team;
C – closed position for closing the team.
Dual modifiers H and HH and L and LL used to refer to the upper and lower levels of pre-crash and alarm.
Digits – number of technological position in line with the project document.

Alphanumeric combination corresponds tagging technology unit.

 

Table 1 – The analog signals

Тип Тип
сигнала
Буквенное
обозначение
Описание Пример
Technological
parameter
AI LT The analog input signal from the level sensor LTG100
РТ PT analog input signal from the pressure sensor РТD101
ТТ The analog input signal uniform temperature ТТN102
ТЕ Non-standardized input temperature signal from the primary transducers (thermocouple, resistance thermometer) ТЕA103
Manager
signal
AO LV, PV, TV Analog output control valve control signal LVF100

 

Based on the foregoing, instrumentation and position A and the distributed control system functions and emergency protection systems are identified as follows:

Table 2 – Digital signals

The following conditions apply when assigning tags:

the total number of alphanumeric characters in a tag name may not exceed 16;

using of punctuation marks and spaces to separate the characters within the tag is not allowed.

Type (refer to the first letter) Signal
Type
Lettering Description Example
Process parameter

DI

 

 

LAHH

РАНН

ТАНН

Discrete input high-level pre-alarm TANN

(Pressure, temperature)

LAHH100

LAH

РАН

ТАН

Discrete input high-level alarm

(Pressure, temperature)

LAH100

LAL

PAL

Digital input low level alarm

(Pressure, temperature)
 

LAL100

LALL

PALL

TALL

Digital input low-level pre-alarm

(Pressure, temperature)

LALL100
Process parameter DI

LSHH

PSHH

TSHH

DSHH

Discrete input high-level pre-alarm

(Pressure, temperature,

differential pressure)

LSHH100

LSH

PSH

TSH

DSH

VSH

Digital input signal warning

alarm high

level
TSH (pressure, temperature, differential pressure, vibration)

LSH100

LSL

PSL

TSL

DSL

Digital input signal warning

low level alarm

(Pressure, temperature,

differential pressure)

LSL100

LSLL

PSLL

TSLL

ISLL

DSLL

Digital input low-level pre-alarm

(Pressure, temperature, current, pressure drop)

LSLL100
Electric valve (Z)
ZSC Status of valve “closed” ZSC161

 



ZSO Status of valve “open” ZS0161


ZSM

Status valves

“Jamming“

ZSM161


ZVC “Close valve” command ZVC161 ZVC161


ZVO The command “open valve» ZV0161 ZV0161


ZVS “Stop” command ZVS161 ZVS161




SSC151




SS0151




SV151




SS300




SV300




NS101




NV101




VS501




VVR501




VVS501




РВ1




HS1




BS2




XV2





The following conditions are accepted the appointment of tags:

the total number of alphanumeric characters in a tag name may not exceed 16;

the use of punctuation marks and spaces to separate the characters within the tag is not allowed.

 2. The encoding function blocks in the database

When specifying a tag in the database, a set of tag set of characteristics, according to which is determined by: the type of tag, security code, description tag (up to 16 characters), the process of accumulation and representation in the historical database, data source. The additional tag characteristics can be set depending on the tag type, such as minimum and maximum values, scaling and offset, “Enabled” label and Off “and others. Features include a tag to reference data, and its current value is the operational information.

Table 3 shows examples of lettering of the main types of process parameters.

Table 3

Letter symbol tag Description Note
ТIOххххх Program block temperature control of process parameters (TP) Functional
unit (PID)
TIxxxxx Program block temperature display (TP) Functional
block (PVI)
TYxxxxx The software unit calculates the temperature parameter (TP) Functional
unit (CALCU)
TDCxxxxx Program the temperature control unit calculating the difference (TP) Functional
unit
(PID)
FICxxxxx Program block flow rate control (TP) Functional
unit
(PID)
FIxxxxx Program block the flow rate indication (TP) Functional
unit
(CALCU)
FYxxxxx The software unit costs correction (TP) Functional
unit
(PID)
LICxxxxx The software level control unit (TP) Functional
unit
(PVI)
LIxxxxx Program block-level display (TP) Functional
unit
(CALCU)
PICxxxxx Software pressure control unit (TP) Functional
unit
(PID)
PIxxxxx Program block pressure indication (TP) Functional
unit
(PVI)
QICxxxxx Software furnace heat load control unit Functional
unit
(PID)
QYxxxxx Program block furnace heat load calculation Functional
unit
(CALCU)
AIxxxxx Program block indication variable value (TP) is transmitted from the analyzer Functional
unit
(PVI)

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Russian version



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