Rules for defining names

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.

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

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.

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.

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

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