remote sensing/managing, is SCADA system. very expensive
and powerful. 

with SCADA sit there in high price, every one have to be 
expensive.




----- Original Message ----- 
From: "Chen Xiao Fan" <xiaofan@sg.pepperl-fuchs.com>
To: "'Microcontroller discussion list - Public.'" <piclist@mit.edu>
Sent: Wednesday, June 01, 2005 8:53 PM
Subject: RE: [EE] Wireless Sensors


> In the industrial automation sector, cabling is one of the 
> large portion of the cost. Therefore comes the idea of fieldbus.
> Instead of one to one cable connection (each sensor to PLC/DCS),
> you will have multi-sensors connected to a bus (eg. ASi bus -- 
> actuator sensor interface), then through a gateway (eg: ASi 
> to Profibus gateway), all the sensors are connected to the 
> PLC/DCS.
> 
> Now comes the wireless, you cut the last "mile" of cable from
> the system. The problem with Zigbee is still the with current
> consumption and cost. Adding 10s of mA to a sensor which only
> consume less than 100mA is a lot. Adding US$5 to a US$25 sensor
> is as well quite a lot. The space is another issue even though 
> PCB antenna is getting smaller. Another obstacle is that this 
> sector is quite conservative. The PLC/DCS makers control the
> market (Siemens, ABB, Honeywell, Rockwell, Invensys, Yokagawa, 
> Omron, AB, etc).
> 
> Chipcon seems to be the leader now. Parts from Freescale are
> now very expensive.
> 
> Regards,
> Xiaofan
> 
> -----Original Message-----
> From: Richard Prosser [mailto:rhprosser@gmail.com]
> Sent: Thursday, June 02, 2005 7:16 AM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] Wireless Sensors
> 
> 
> Look at ZigBee (www.zigbee.org ?)
> Chips Maunufactured by Freescale, Atmel, Chipcon & a few others.
> Microchip support for the Chipcon version using an 18 series micro.
> 
> RP
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