ITECH7407 Real time analytics Proof Reading Services

ITECH7407 Real time analytics Oz Assignments

ITECH7407 Real time analytics Proof Reading Services

Introduction

This paper presents a requirements analysis specification of a Real-Time System; Central Heating Control System V10. The result of the system analysis is presented in form of a;

1. Data Flow Diagrams (DFDs)
2. Entity Relationship Diagrams (ERDs)
3. RT-SASD modifications and components
4. Control Flow Diagram extensions (CFDs),
5. Process Specifications (PSPECs)
6. Data/Requirements Dictionary
7. Control Specifications (CSPECs)

Entity Relationship Diagram

Control/Data Flow Diagram (Level 0)

Control/Data Flow Diagram (Level 1)

Process 1 Control/Data Flow Diagram (Level 2)

Process 2 Control/Data Flow Diagram (Level 2)

Process 3 Control/Data Flow Diagram (Level 2)

Process 4 Control/Data Flow Diagram (Level 2)

Control Specification (Process Activation Table)

Only for starting the heating when the temperature falls below the set value AND stopping the heating when the temperature goes beyond the specified value during the heating project process.

Current temp below specified level?	Activate	Activate	Activate
TRUE	2.2	4.1	5.1
FALSE	2.3	4.2	5.2

New temperature is above specified level	Activate	Activate	Activate
TRUE	2.3	4.2	5.2
FALSE	-	-	-

Duck was manually closed?	Activate	Activate	Activate
TRUE	-	-	-
FALSE	4.1	-	-

Gas meter available?	Activate	Activate	Activate
TRUE	5.1	-	-
FALSE	-	-	-

Process Specification

Verify If current temperature is below the specified value

get specified_temp_level;

Read current_temp

if(current_temp < specified_temp_level)

activate_heating_unit = true

else

activate_heating_unit = false

Current temperature is compared with the specified temperature;

if the current temperature falls below the specified value; the heating process

is activated; which requires a number of processes.

Verify availability of heating components to activate heating

get heating_unit_fans_status

get heating_unit_status

get gas_meter_supply_status

get heating_ducts_status

get time

get day

if(heating_unit_fans_status = available

AND heating_unit_status = available

AND gas_meter_supply_status = available

AND heating_ducts_status != manually_closed){

open_ducts = true

start_gas_flow =true

start_fans =true

start_heating_unit=true

}

Heating can only start if the temperature falls below the specified value, and the components are available. This is dependent on time and day.

Combined process to initiate heating

get specified_temp_level;

Read current_temp

while(current_temp < specified_temp_level) {

get heating_unit_fans_status

get heating_unit_status

get gas_meter_supply_status

get heating_ducts_status

get time

get day

if(heating_unit_fans_status = available

AND heating_unit_status = available

AND gas_meter_supply_status = available

AND heating_ducts_status != manually_closed){

open_ducts = true

start_gas_flow =true

start_fans =true

start_heating_unit=true

}

Read current_temp

if(manual_Input)

break;

}

This code block uses a while loop to represent the continuous nature of the process of checking the temperature, and taking corrective measures if the temperature falls below the set limit. The code runs in an endless loop and can only be interrupted if a manual input is encountered; in which case the execution breaks the loop.

Store New Temperature Value

Get current_temperature;

new_temperature = current_temperature

This updates the new temperature value with the current temperature.

Open Heating Duct

Get heating_duct_status

if(heating_duct_status != manually_closed)

heating_duct_status = open

A heating duct can only be opened if it was not manually closed. This code checks if the duck was closed manually before opening the duck.

System Control Panel

Listening and executing commands

new_command = command

switch(command)

{

caseConfigure Temperature Detector:

display options:Celsius , Fahrenheit

get user_selection;

set temperature_metrics = user_selection

break;

Case Set Heating Program:

set day = get selected_day;

set time_period = get_time_period;

set min_temp = get_ temp_lower_limit;

set max_temp = get_temp_upper_limit;

save settings;

break;

CaseManually Change Heating program:

set day =get selected_day;

set time_period =get time_period;

set min_temp = get_temperature_entered;

Case Turn System Off:

close_ducts

stop_gas_supply

stop _heating_fan

stop_heating_unit

set heating_fan_status = unavailable

set heating_unit_status = unavailable

displayducts_status

displaygas_supply_status

display heating_fan_status

display heating_unit_status

break;

Case Turn System On:

open_ducts

set heating_fan_status = available

set heating_unit_status = available

displayducts_status

displaygas_supply_status

display heating_fan_status

display heating_unit_status

}

Data Dictionary

Schedule Events
Name	Description
Every 5 minutes, for duck current state	An event initiated by the system after every 5 minutes to check the status of the heating duck
Every 30sec, for Gas Meter Supply Status	An event initiated by the system after every 30 seconds to retrieve the status of the Gas Meter Supply Status
Every 30 Sec for Heating Unit status	An event initiated by the system after every 30 seconds to retrieve the current status of the heating unit



Dictionary for all processes
close_duct	Command to initiate closing of the duct
open_duct	Command to initiate opening of the duct
duct_status	Data representing current state of the heating duct
manually_closed	Data that represents state of the heating duct that was manually closed and cannot be opened by the system
command	User inputs through the control panel
start_gas_flow	Command to initiate flow of gas into the heating unit
stop_gas_flow	Command to inform the gas meter to shut the gas flow
current_gas_supply_status	State of the gas supply meter
current_date,	Data representing the day's date
current_time	Data representing time
set_heating_unit_fan_state	Command to set the state of the heating unit
fan_state	Data representing the current state of the fan
set_heating_unit_state	Command to set the state of the heating unit
current_heating_unit_state	Data representing the current state of the heating unit
current_temp	Data representing the current temperature
message	Information sent to the display board for display purposes.
System Control Panel	The interface that will allow users to enter configurations and interact with the system
System Display	The system's point of outputting the status and other information to the user
System Temperature Detector	Component to detect the environmental temperature
System Clock	Component that provides the system with the current time , date and day.
Heating Unit Fan	Component that aids in circulating the heat, emitted to regulate the temperature
Heating Unit	The unit responsible for generating heat that is used to raise the temperature of a room, when temperatures fall below specified limit
Gas Meter Supply	Component that interfaces the system to the external gas supply, and records gas usage
Heating Duct	Component used to blow heated air

Conclusion

An analysis of real-time system requirements has been presented in this paper. The system under review is a Central Heating Control System V10. The result of the analysis is presented in form of a; Data Flow Diagrams (DFDs) , an Entity Relationship Diagrams (ERDs), RT-SASD modifications and components, Control Flow Diagram extensions (CFDs), Process Specifications (PSPECs) , Data/Requirements Dictionary and a Control Specifications (CSPECs).

References

1. Pressman, R. S. (2010). Software engineering: a practitioner's approach. Palgrave Macmillan.
2. Kendall, K. E., & Kendall, J. E. (2010). Systems analysis and design. Prentice Hall Press.
3. Laplante, P. A., & Ovaska, S. J. (2011). Real-time systems design and analysis: tools for the practitioner. John Wiley and Sons.