three wire transmitter connection

panthripu · Oct 31, 2009

Hi everybody
How can i connect a 3wire transmitter(4-20mA) to analog input card of siemens PLC S7-300/400.
One of my transmitter with two wire (4-20mA) failed.Right now i have similar type of tranmitter with three wire.What changes should i do to fix it with old card ?
In this new transmitter i see three terminals (+)power(7-30vdc) , (s)signal 2-20mA,(-)ground.

ArikBY · Oct 31, 2009

Very simple

+ +24V
- -24V
Signal to your card.
You will see that the - is already connected.

Good luck

panthripu · Nov 1, 2009

help

hi
thanks friend , but it seems very easy for you but for me , i m really confused.You might be talkinga bout some other PLC but in simens i see two terminals for one channel.

ArikBY · Nov 1, 2009

Every PLC have 2 terminal each input + & -.
- can come from power supply or from the sensor.
If you have Transducer you might have 2 output wires.+&-.
They go to your card + to +,- to -,

Mickey · Nov 1, 2009

Maybe this will help,see picture and PDF below.
Note: Labeling on your controller may be different.

http://www.dataforth.com/catalog/bb/133_388652239.pdf

panthripu · Nov 1, 2009

3 wire analog input wiring

hi
It seems mickey is right to some extent.The power supply is part of input card if the card is configured for two wire.So +ve supply will be available at +ve of the analog channel and it will be connected to +ve of transmitter.
The signal wire will come back to -ve of the analog channel. and GND or -ve should be connected to -ve of power supply for card.

panthripu · Nov 1, 2009

3 wire analog input wiring

check it , if it is right .

danw · Nov 1, 2009

which model analog input card?

panthripu · Nov 1, 2009

alanog input

331-7kf02-0ab0

three wire transmitter connection

panthripu

Member

ArikBY

Member

panthripu

Member

ArikBY

Member

Mickey

Lifetime Supporting Member

panthripu

Member

panthripu

Member

danw

Lifetime Supporting Member

panthripu

Member

Similar Topics