Show Real Value on HMI using Modbus TCP connection

[pawel_kowalski_]

Hi,

I have a problem with how to show on HMI XBTGT4330 real value e.g. 123.553
I read the water flow from the water meter as 32-bit register on PLC I have a solution for how to show the property value of the meter but I don't find a solution for how to send it to HMI.
 I try to convert them to DWORD and use a register like %MD but I don't know how to read that on HMI.

Thanks for your help.

[LeTomas]

Hi @pawel_kowalski_ ,

I am not 100% sure which PLC you are using but if the variable in the PLC side is already a real variable you can use the %MW on the variables on Vijeo Designer to access to the information.

See example below using a Modiocn M172 with a simulated XBTGT4330:

Best regards,

LeTomas

[Possebom]

Also,  you can define it on Numeric Display Settings

[pawel_kowalski_]

Hi,

I have TM251MESE PLC,  but starting at the beginning:
1. I have an analog sensor with 4-20mA output connected to TM3AI4 input
2. I scale the 4-20mA input on the physical sensor range using the scale function which gives me a real value some like  24.59954001123450 on max value has 119.99999999999999
3. Now I must send the value above to HMI connected to that PLC, send it to another PLC, and show it on HMI connected to a second PLC using Modbus TCP.
And the question is how to convert that value and send it. 

[Bastian_Schmitz]

To see the Real value on the HMI you need only to define the value as REAL in the HMI software and to allocate the first of the two words. If a other PLC read the value from the PLC it is more or less the same. The other PLC need to read 2 16 values and merge them together into a real. Regarding to HMIs this function is normaly integrated in the driver. On PLC side you need to do this by your own. This works normaly in the easiest way with a pointer. You could find a solution bases on OSCAT DW_TO_REAL function. 

Some PLCs use a different Byte/Word Order (Siemens in the past) then Modicon. In that case you need to switch these values.

[KJBER]

Hi Pawel. If the 2nd PLC is Schneider also, then perhaps the easiest would be to share vaiable over NVL.

https://www.youtube.com/watch?v=zWM-vxGcD1s

If not, and you have to use Modbus TCP, then I would use try to use Write_Var function block to write to in the multiple registeres (40001-49999 (%MW)). Send 245 over register and dev by 10 to get 24.5 in 2nd PLC.

[pawel_kowalski_]

Hi
Thanks, @KJBER  for the advice, I'll do it differently, but I'll try your suggestion in the future because it looks like a time saver.

[pawel_kowalski_]

And yes both PLC is Schneider product, exactly TM251MESE.