Package: Air Conditioning System

Description:  Control of the Air Conditioning System, setting of the Enclosure Reference Temperature and Dew Point margin, monitoring of the enclosure temperature and dew point sensor.

Package name: acs

Inheritance:  LCU Server Framework <<SubSystem>>lsfSERVER

Controlled HW Devices: 

• <<PLC Device>>airCo:lsfSERIAL
  • Database: atacsDB_PLC:lsfDB_PLC
  • Interface: plccom
• <<Task Device>>monitor:lsfTASKDEV
  • Database: atacsDB_MONITOR:lsfDB_TASKDEV

Controlled SW Devices: none

Deployment:  Auxiliary LCU: atacsServer

Use Case diagram: 

Class diagram: 

Architecture: 

As of the current issue of the ICD [AD 20] and described in ICD Air Conditioning, the architecture of this sub-system is described below: Air Conditioning control and monitor
This LCU Software Device is instantiated from the LCU Server Framework lsf.
The sub-class <<SW Device>>atacsServer:lsfSERVER is composed of an instance of the PLC serial communication class <<PLC Device>>airCo:lsfSERIAL, and of one instance of the monitor device <<Task Device>>monitor:lsfTASKDEV.

The hardware is driven via the RS422 serial communication port /tyCo2 available on the LCU Transition Module.
The protocol is ASCII, 1200 bauds, 8 data bits, 1 stop bit, no parity.
The details of the communication protocol are described in the Sauter PLC EY2400 User Manual [AD 28].

The following Specific Commands for the control and monitoring of the air conditioning sub-system are provided:

• START,  STOP and STATUS:  start, stop and check the status of the Air Conditioning system (PLC).
• GETTEMP: get the enclosure and dew point temperatures.
• GETDEWT: get the dew point temperature.
• GETENCT: get the enclosure temperature.
• SETDEWM: set the dew point temperature margin.
• SETREFT: set the Reference Temperature.

Command Definition Table:  atacsServer.cdt

Command Interpreter Table:  atacsServer.cit

Reuse from VLT TCS:  New package; the implementation of the communication protocol is based on the VLT module plccom.

Issues to be Determined or Resolved: None

Last modified: Wed Jun 27 07:50:49 UTC 2001