Practical Problem with C-Bus Application

Hi to u all guys,
It's just a practical problem can be faced with the lighting control application.
In a typical C-Bus application consider a situation where enduser is in a office room which is having local control through key input and master control from security room.
While the user is at work in the office,the security person switches off the lights frm the office room.We cannot restrict from giving the master control.Here the requirement is,as long as the enduser is in office room,secuirty person must not be able to switch off that lights.He can switch off only if there is no circuits on the room.

How can we acheive this?Anyway of such protection?Please suggest

Thanxand Regards..

 

Before doing anything, we need to break down the situation to consider every steps.

(1) How do you tell if the user is in the room? By presence sensor? By local switches status? By phone calling into the office?....

(2) Under what conditions the security guard would need to switch all lightings from master control?

(3) Would there be a more complicated master control, such as BMS, a lot of keys rather than one or two keys?....

The first question is the most important. In a real practical situation, the client must have some kind of idea. In fact, if the security room is only accessible by security guard and he can switch off everything without checking the office.......

In an old project, there is a master switch that many people can access and switch off everything when the last person leaves. It was proposed to give convenience but I would think that was a bad idea because of the location of the master switches. However in that case there are a lot of presence sensor and most staff are reminded not to touch the switch, so they know what to expect.

 

Thanx Wanricky..
Similar situation can happen in many cases,when we provide the control to output devices through different input devices located in different places.

Can we restrict the control temperorly using password protection(Touch screen or SChedule Plus Software)?

 

Simple solution.
Install an occupancy sensor in the office.
If rooms occupied - lights ON
If room unoccupied for set period - lights OFF
=
No need for security guard to turn off the lights

You can then expand on this and incorporate corridor linking so the open plan office and / or lights remain on whilst-ever any enclosed office light is on.

Once all offices are vacated at the end of the day, the open plan and passage lighting turns off after a predetermined time period.

From lots of large scale project experience, keep as much control as local as possible - unless it a public space.