Exists a device which read multiple 4-20mA sources and sends to acquired values through a RS 485 bus?

 

http://www.dghcorp.com/converters/

http://www.stiweb.com/proddata/cmcp420AD8.htm

http://www.bb-elec.com/product.asp?sku=I-7017&support_dept_id=279

Here are few.

 

Both Wago and Beckhoff make such a device.

 

Quattro

We can provide a device which will do this at low cost. Please contact us off list.

Steve Myres
Automation Solutions
(480) 813-1145
[email protected]

 

Yes many devices are available for reading 4-20 mA and convert the data into RS485. You see the Dynalog's ADAM 4000 series devices supports your requirement. Particularly ADAM 4017 can do this. ADAM 4017 supports 8 Analog inputs and provides the data in RS485 format. I used this device for many projects.

 

Hello:

Moore Industries can do this with the NET Concentrator System. Information can be found at: http://www.miinet.com/products/sg_distributed.shtml

Or, give me a call.

Regards,
Steve Todd
Moore Industries
818-830-5502
[email protected]

 

Hi Quattro,

A PLC can do it (with some logic in it) - provided you also specify:
1. Which protocol you want to run on the RS485 PHY (physical) interface - remember - RS485 is not a protocol - just a physical interface.

2. When and how to send the data over RS485 - 4-20mA is a continuous analog phenomenon - whereas serial data is made of discrete messages comprising in turn digitally encoded values.

Meir

 

Check out SIXNET's RS485 I/O modules at:
http://www.sixnetio.com/html_files/products_and_groups/io_remotetrak.htm