Load cells and EM231

mohamed_plc

Member

M

Join Date

Jan 2009

Location

algeria

Posts

11

• Feb 15, 2009

• #1

Hello
I would like to connect an load cells 4 or 6 wire to an analogue input EM231.
I don’t want to use SIWAREX MS module .

-------- ------ ---
| | | | | |
| CPU226 |-| EM231|-- ? |- load cells
| | | | | |
-------- ------ ---
I don’t know if I need a transducer
please help me

 

Clay B.

Lifetime Supporting Member

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Join Date

Jun 2005

Location

Concord,NC

Posts

1,304

• Feb 15, 2009

• #2

If you do not use a MS module you will have to use a converter to take you load cell signal and convert it into an analog signal. Note: Some resolution will be lost. Amount depends on your analog card and your converter.

 

dchartier

Member

D

Join Date

May 2003

Posts

1,546

• Feb 15, 2009

• #3

Hello mohamed;

An example of one product you could use:
http://www.laurels.com/transmitter-4-20-loadcell.htm

Please have a look on the web, or through local providers of loadcells, there are many vendors avaiolable.
Hope this helps,
Daniel Chartier

 

mohamed_plc

Member

OP

M

Join Date

Jan 2009

Location

algeria

Posts

11

• Feb 16, 2009

• #4

HELLO Daniel,
I find an other Transducer (4-20mA,0/10V,+-10V) FOR LOAD CELLS from www.hbm.com

 

BryanG

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Join Date

Feb 2005

Location

Manchester

Posts

1,986

• Feb 16, 2009

• #5

A method that retains accuracy and resolution is to use an amplifier with an RS485 output like this one. Then use one of the Ports on the PLC in Freeport mode.

Bryan