I have a system like this:

|PLC S7-300|      |ET 200S 6ES7134-4GB11-0AB0 2 AI 4 WIRE|      |Smar301 TT|      |3wire RTD|

I want to know (and if i can) how to connect a 2 WIRE transmiter (Smar301 TT) to a 4 WIRE module (6ES7134-4GB11-0AB0).

This is what i tried so far reading a lot of forums:

FIRST

|6ES7134-4GB11-0AB0|                            |Smar301 TT|

          M+ | 1                                             - (negative terminal) 

          M-  | 2                                             +(positive terminal)           

          L+  | 3                                                 Not connected

      Mana | 4                                                 Not connected

SECOND

|6ES7134-4GB11-0AB0|                            |Smar301 TT|

M+ | 1                                             - (negative terminal)

M-  | 2                                             TO 4 (short 2,4)

L+  | 3                                                 +(positive terminal)

Mana | 4                                          TO 2 (short 2,4)

THIRD (same as second but reference to 0V)

|6ES7134-4GB11-0AB0|                            |Smar301 TT|

M+ | 1                                             - (negative terminal)

M-  | 2                                             TO 4 (short 2,4)          TO M or 0V

L+  | 3                                                 +(positive terminal)

Mana | 4                                          TO 2 (short 2,4)

FOURTH

24VSOURCE+           TO           +(positive terminal of TT301)

+M|1of Module           TO           -(negative terminal of TT301)

-M|2of Module            TO           GND, M or 0V

In these four scenarios the transmisor turn on and shows correct celcius temperature value in the TT301 screen. But, when i connect the plc in observation mode I can't read anything in the AI ports. Only the digital inputs/outputs work and can be readed online in the observation tool.

I know that the 6ES7134-4GB11-0AB0 it's suposed to work with 4WIRE TT but it should work for 2WIRES too, even if it's don't suposed to. Also try a lot of configurations in TIA PORTAL and STEP7 and always shows a 0x00 value (nothing) in the observation tool of AI signal.

Is it even posible to connect 6ES7134-4GB11-0AB0 to 2WIRE transmiters?, Maybe the SMAR T301 with HART have some problems with the module? Do I need a hart module to read correctly?

Please Help anyone, I attach a image to ilustrate better one of the four situations, thank you.

Sergio Muñoz A

Tai Chile Ltda

I think you need to select RTD module. Please go with the attached wiring details