Connecting temperature/Humidistat to LOGO8

This is going to be a really easy fix I know ....................but it's doing my head in !!

I have a LOGO8 24VDC with relay output and the supply is fed from a Siemens 24v PSU

I have a Temp sensor (see attachment) which needs a 5v feed so I have wired a DC-DC convertor (24>5V) from the O/P of the Siemens PSU to create the 5V

When switched on I have voltage at both O/P's of the sensor and connected these to two LOGO inputs (0-10v)

My question is  - Why I'm I not seeing the inputs on the LOGO software ?                      

Thank you in advance

Thank you...just tried that as I was waiting for a reply

Is there any specific I/P I should use for these two sensor I/P's and threshold trigger ?

Attached is what I have at the moment.......open to suggestions

The temperature is measured separately by a NTC.
An NTC You can not just evaluate a 0-10V input, because he has no linear characteristic.

Only the humidity measurement can be put on a 0-10V input. But since they only 1 to 4VDC outputs for 0-100% RH, you have to scale the value in the logo only.

Hello,

Thank you for your answer

The ladder you have posted I have downloaded and connected the Humidity sensor O/P which is giving 2.13V  but nothing is showing on the display screen

Do I have to set the gain and offset for it to work ?

Nalabala

Hello,

Thank you for your answer

The ladder you have posted I have downloaded and connected the Humidity sensor O/P which is giving 2.13V  but nothing is showing on the display screen

Do I have to set the gain and offset for it to work ?

In my program I have used the AI1, in your screenshot is AI7. Gain and Offset in my program are right.

Have you selected the correct AI?

Hi,

Yes I copied your diagram and connected it to I1

Do I have to change anything on the software side ?

AI1 is not terminal I1 an base module.

AI1 is tetminal I7.

Sorry, still nothing

I know your prog works on simulation, but shows nothing when I power it up

ixo65

Have the 0V of 5VDC the same potential as 0V of the power supply of the logo? If not, both 0V together.

Have this checked? If the two 0V connected?

I can not judge whether you have connected everything correctly from a distance.
Have you ever measured which voltage at the analog input?

Which logo you have exactly? Please specify the complete order (6ED1052 - ????? - ????)

Hi,

The Input voltage is 2.31v and both 0v are together

The Logo 8 we are using is a 6ED1 052 1HB00 OBA8 (24 RCE)

Nalabala

Hi,

The Input voltage is 2.31v and both 0v are together

The Logo 8 we are using is a 6ED1 052 1HB00 OBA8 (24 RCE)

Since I have bad news for you.
You have the wrong logo.
The logo 24 RCE (6ED1 052 1HB00 0BA8) can be supplied with both 24VDC and 24VAC.
Only logos with pure DC power supply have analog inputs.

0BA8 logos with analog inputs are the following: 

LOGO! 8 basic unit LOGO! 12/24 RCE 6ED1 052-1MD00-0BA8
LOGO! 8 basic unit LOGO! 12/24 RCEo 6ED1 052-2MD00-0BA8
LOGO! 8 basic unit LOGO! 24 CE 6ED1 052-1CC01-0BA8
LOGO! 8 basic unit LOGO! 24 CEo 6ED1 052-2CC01-0BA8

0BA8 logos without analog inputs are the following:

LOGO! 8 basic unit LOGO! 230 RCE 6ED1 052-1FB00-0BA8
LOGO! 8 basic unit LOGO! 230 RCEo 6ED1 052-2FB00-0BA8
LOGO! 8 basic unit LOGO! 24 RCE 6ED1 052-1HB00-0BA8
LOGO! 8 basic unit LOGO! 24 RCEo 6ED1 052-2HB00-0BA8

Haha.......that would explain a lot !!!

Thank you................watch this space

Pardon..... ?

I haven't put anything unpleasant have I ?

No way.

You have done nothing unpleasant.

I will unfortunately have to tell something bad.

That's why I wrote:
Sorry, but I would have liked to let you know more pleasant.

That's ok..............thank you for all your help with this

It is very much appreciated !!

Hello Nalabala,

you're welcome.

Hello ixo65,

You were spot on with the wrong Logo 8, all working now with your programme....thank you !

I have also got a AM2 RTD for a PT100 thermocouple, how would I create  a simple programme

that has  3 variable O/P's two for cooling and one to switch a heater

thank you in advance ....... again

Here is a small example.
The number of the analog input is dependent on whether the basic module has, and how many of them are activated.

On the base module not enabled: First number of AI of the 1st expansion module is AI1.
On the base module 2 activated: First number of AI of the 1st expansion module is AI3.
On the base module 4 activated: First number of AI of the 1st expansion module is AI5.

You can activate them in "File> Properties> Properties Offline> I / O settings" check or change.

Default setting: 2 activated.

Thank you ixo65.................thanks a great help

Just another quick one (or two !)

How do you make the set points selectable on the TDE ?

What's the easiest way to switch between pages on the TDE for example Welcome page, heating page and cooling page ?

Thank you yet again