Post by thread:[EE]Any suggestions on realizing 6 panels to 2 mot

part 1 1530 bytes content-type:text/plain; charset="gb2312" (decoded quoted-printable) Hi I'm building a control system realizing 6 control panels to 2 motors communication. The six panels are mounted on different locations about 20 to 30 ft apart from each other, their main functions are the same: controlling two motors at different locations to pump water. These 240V, 12A induction motors are only two speed ones, controlled by a big SPDT switch to change poles (I assume). I wonder which way is easier for a hardware guy to design such a communication bus? I am thinking of using a 8 to 3 multiplexer, the output to each motor will be triggered when any input changes state, this output will turn on a solid state relay instead of the SPDT switch. But the drawback is that I cannot assign an address to each panel, which can be left for some other functions to be added. I won't hesiate to add a microprocessor if you would recommend a better solution. BTW, this is industry oriented. Someone also recommends FPGA or CPLD, is there any ready-to-use modules for that? since the functions are that simple. Another problem is that: since the panels are far apart, and they are actually mounted around a swimming pool, thus some wireless board seems to be a fit. Are there some "ready to use" modules that have some simples I/Os and are able to transmit signals to about 20, 30 ft away? Thank you very much. _________________________________________________________________ MSN ��ʱ��Ѷ��ۼ��Ż�� http://cn.msn.com part 2 35 bytes content-type:text/plain; charset="us-ascii" (decoded 7bit)

2008/9/17 gardenyu <spam_OUTgardenyu2004TakeThisOuThotmail.com>: > > Another problem is that: since the panels are far apart, and they > are actually mounted around a swimming pool, thus some wireless > board seems to be a fit. Are there some "ready to use" modules that > have some simples I/Os and are able to transmit signals to about > 20, 30 ft away? Typical solution (not necessary suitable for your application) is to use a small PLC and small drive unit. The communication method can be RS485 based or CAN based. If you want wireless, typically PLC vendors will have wireless modem for serial based protocol. Xiaofan

part 1 3103 bytes content-type:text/plain; charset=GB2312 (decoded quoted-printable) Hi Gardenyu, Get your self a small PLC and a couple of RF transponders. "Moxa" has all the bits you need. You job really is a very simple process control system that could easily and cheaply done with the above hardware. Contact me of list and I can put it all together for you. Kind Regards Grant Brown gardenyu wrote: > > > Hi > > > I'm building a control system realizing 6 control panels to 2 motors communication. The six panels are mounted on different locations about 20 to 30 ft apart from each other, their main functions are the same: controlling two motors at different locations to pump water. These 240V, 12A induction motors are only two speed ones, controlled by a big SPDT switch to change poles (I assume). I wonder which way is easier for a hardware guy to design such a communication bus? I am thinking of using a 8 to 3 multiplexer, the output to each motor will be triggered when any input changes state, this output will turn on a solid state relay instead of the SPDT switch. But the drawback is that I cannot assign an address to each panel, which can be left for some other functions to be added. I won't hesiate to add a microprocessor if you would recommend a better solution. BTW, this is industry oriented. > > Someone also recommends FPGA or CPLD, is there any ready-to-use modules for that? since the functions are that simple. > > Another problem is that: since the panels are far apart, and they are actually mounted around a swimming pool, thus some wireless board seems to be a fit. Are there some "ready to use" modules that have some simples I/Os and are able to transmit signals to about 20, 30 ft away? > > Thank you very much. > _________________________________________________________________ > MSN ��ʱ��Ѷ��ۼ��Ż�� > http://cn.msn.com -- Kind Regards Grant Brown SiteDoc Pty Ltd mob: 0412 926 995 http://www.sitedoc.com.au __________________________________________________________________________________________________________ This email message together with any attachments is intended only for the addressee(s) and contains information that may be confidential and/or copyright. If you are not the intended recipient, please notify the sender by reply email (or telephone SiteDoc Pty Ltd on +61 2 42291185) and immediately delete this email together with any attachments from your computer. If you are the intended recipient, you must not copy, disclose, reproduce or distribute this communication together with any attachments without the authority of SiteDoc Proprietary Limited. No representation is made that this email or any attachments are free of viruses. Virus scanning is recommended and is the responsibility of the recipient. Unless specifically stated by the sender as the views of SiteDoc Proprietary Limited, any views expressed in this message are those of the individual sender, and no responsibility will be borne by SiteDoc Proprietary Limited for its content or outcomes. part 2 35 bytes content-type:text/plain; charset="us-ascii" (decoded 7bit)