Duule

Hi,

I have pressure transmitter 4-20mA output with two wires + and -  (danfoss mbs 3000) and I wont to connect it on digital input I8 of Logo oba7. Can you attachment scheme of wiring transmitter and plc and resistor?

You have to wire the sensor as shown in the picture in the attachment.

Through the resistor (500 Ω), the current flows from 4 to 20 mA and generates a voltage drop of 2 to 10V at the resistor. This voltage drop can then be measured and evaluated with the analog input 0 to 10V (AI2 at terminal I8).

Duule

I made and worked. only the range of scaling is -220 to 980 for 0-10 bar and when the pressure 0 bar in the display reads -2.20 bars. while, for 4 bar correctly displayed in the 4.00 bar display.

can anyone help me how to make that when the pressure is 0 bar and show 0 bar on the display

You have the wrong sensor settings.

Your sensor has a measuring range of 0-10 bar and outputs this as 4 to 20 mA.
Parameterization of the analog amplifier:

Sensor type: 4 ... 20 mA
Minimal: 0
Maximum: 1000
Gain: 1.25
Offset: -250
Decimal places in the message text: 2