I have an RTD PT100 temperature probe, I want to read the temperature value displayed on the screen, through the AI ​​pin of PLC LOGO, and read it with the AM2 RTD expansion module. Can someone please help me with an example? I'm new to PLC LOGO so I don't understand much about analog function blocks to use them properly.

ixo65

Your PT100 probe has a anlog output transmitter 4-20mA. So you can it not connect to the AM2 RTD.

And the temperature range 50 - 600 °C is not good, the resolution in the LOGO! by using a analog input 4-20mA is bad. One unit changing is ±5.5 °C.

Edit:

If I remember correctly, you have a LOGO! 24CE.
This has analog inputs, 0-10V. You can then evaluate the 4-20mA using a 500 Ω resistor.

 Yes, I have a LOGO 24CE PLC, I have 4 0-10VDC analog input ports. Can you show me how to wire it and add a 500 Ohm resistor. and an example of a program that can receive input values to output temperature values

ixo65

The blue component in the connection compartment is the PT transmitter. It is screwed to the connection compartment with 2 screws. There are 3 white wires coming out of the pipe. Disconnect the three wires from the connection terminals and remove the two screws that secure the transmitter. Then you can take out the transmitter and connect the 3 wires to the AM2 using terminals.

By default, the first two addresses (AI1 and AI2) are reserved for the base module. So the first of the two channels of the AM2 RTD is then AI3.

 I see that my base module has 4 AI pins, do I need to change this AM2 module to AI5?

ixo65

The blue component in the connection compartment is the PT transmitter. It is screwed to the connection compartment with 2 screws. There are 3 white wires coming out of the pipe. Disconnect the three wires from the connection terminals and remove the two screws that secure the transmitter. Then you can take out the transmitter and connect the 3 wires to the AM2 using terminals.

By default, the first two addresses (AI1 and AI2) are reserved for the base module. So the first of the two channels of the AM2 RTD is then AI3.

 Thanks brother, I read the temperature signal of the RTD100, and realized that the use of the AI pin in the program is configured by the I/O settings section. I can leave AI1 when I enable 0AI, or I will use AI3 when I choose to enable 2 AI pins, and if I enable 4 AI pins in the LOGO!24CE module then in the program I will use AI5 pin to Read the IC1 signal of AM2