Central Heating Control System V10 (CHCSV10) - Entity Relationship Diagram, Data Flow Diagram, Control Flow Diagram, Process Specification, Control Specification

Central Heating Control System V10 (CHCSV10) 1
Central Heating
Control System V10
(CHCSV10)
Student id: -
Student name: -
Date: -

Central Heating Control System V10 (CHCSV10) 2
Table of contents
1. Entity relationship diagram (ERD) .......................................................................................................3
2. Data Flow diagram (DFD) .....................................................................................................................6
3. Control Flow Diagram (CFD) .................................................................................................................8
4. Process Specification (PSPEC).............................................................................................................10
5. Control Specification (CSPEC) ............................................................................................................15
5.1 Process Activation table ............................................................................................................15
5.2 State Machine Diagram (SMD) ..................................................................................................15
6. Data dictionary ....................................................................................................................................16
7. Bibliography ...........................................................................................................................................17

Central Heating Control System V10 (CHCSV10) 3
1. Entity relationship diagram (ERD): -
I create this entity-relationship diagram according to given requirements. According to the
required system Display unit system all the information related to Control heating system. Users
communicate with the system by using System display unit. By using this system display user set
temperature, timer, and status of all components of the system. But Control Heating unit
communicate with system display by using the system control panel. If Control heating system is
operational then system control panel display the output on the system display unit. So we can
say that there is many to many relationships between Control heating system and system display.
I create nine entities according to the requirements. And there are the following: -
 Entities: -
1. System Display: - system display entity store all information that displays on the
system display at that time. For example heating unit state, temperature, number
of Ducts open, close, Gas meter reading etc.

Central Heating Control System V10 (CHCSV10) 4
2. System Control Panel: - system control panel store information system display
and control heating system. It means that this entity store foreign key of system
display entity and Control Heating System.
3. Control Heating System:- Control Unit entity store all information of heating
unit, system temperature controller, Ducts, gas meter, heating unit fan and the
system clock. It means that this entity store all foreign keys of heating unit entity,
Ducts entity, Gas Meter entity, Heating Unit Fan entity and System Clock entity.
4. Heating Unit: - Heating Unit entity store information different heating unit
number, heating capacity, state, operating/not- operating etc.
5. System Temperature Controller: - System Temperature Controller entity store
information related to Heating Unit Temperature. Because it is a process of the
heating unit.
6. Ducts: - Ducts entity store information related to each Duct, state of duct etc.
7. Gas meter: - Gas meter entity store information related to the state of the gas
meter, gas meter reading, operating/ not- operating etc.
8. Heating Unit Fan: - Heating Unit Fan entity store information related to each
heating fan, state of the heating fan, operating/ not- operating etc.
9. System Clock: - System Clock entity store information related to date, time, the
day of the week, the vital component in the real-time actions of the system.
 The relationship between entities: -
1. 1: 1 relationship between Heating Unit and System Temperature Control entities. A
Heating Unit System has one and only one System Temperature Control and each
System Temperature Control has one and only one Heating Unit System.