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Modbus address range

Hi, i am required to communicate with some modbus devices via tcp, i understand that i need to assign modbus addresses to these devices so i can get my data correctly. I read that the address range is from 400001 to 49999. i am just doing read only communications (i.e getting data from the devices) both analog and digital.

This is what i am doing now.

Generator running status - 400101
Engine speed - 400102
Common Fault - 400103

thanks

pseudocyber

I must confus, I had to look up what Modbus was.

Have you seen this? It looked like it might help you:

http://www.acromag.com/pdf/intro_modbusTCP_765a.pdf

pseudocyber

Confess, that is.

Darr247

Hmmmm... Registers 400101, 400102 and 400103 could each contain 1 eight-bit byte of data returned from devices (or all 3 registers could be getting input from one device, math functions, et cetera).
Is that what you're trying to do... peek at the register data in the controller using some kind of PC interface card in the controller's rack?

jaxrpc

ASKER

i think like what Darr247 said all these addresses are registers addresses. I used Modscan32 a free modbus software and i am able to peek at the data in these addresses. thanks

Darr247

OK... sorry I couldn't tell you more, but I wasn't sure what you were trying to do from the question as stated. yvw.

jaxrpc

ASKER

Moderator : Please close this thread. Not interested in the answer anymore.

Darr247

You are able to close it. If you feel our answers were of no help, then click the 'YES' button in your own reply (https://www.experts-exchange.com/questions/22989607/Modbus-address-range.html?cid=238&anchorAnswerId=20520867#a20520867) and follow the prompts. Cheers.

jaxrpc

ASKER

no ans to my question

ASKER CERTIFIED SOLUTION

Darr247