AdvancedHMI Software

General Category => Support Questions => Topic started by: RobinH on February 24, 2016, 06:26:03 AM

Title: Modbus TCP illegal datavalue
Post by: RobinH on February 24, 2016, 06:26:03 AM

Hi,

Im trying to read a value over modbus TCP. I have mapped 4001 to a register in my PLC.
When using DigitalPanelMeter1 i get the error Illegal Datavalue.

PLCAddressValue is set to 4001.

What am i doing wrong?

Title: Re: Modbus TCP illegal datavalue
Post by: RobinH on February 24, 2016, 07:40:00 AM

Found out that if I use default modbus mapping in my PLC, it will work up to register 9997 (49999).
I cannot access register 10 000 by this method. If i try 410000 it will only give illegal datavalue.
Default mapping means that all request are automatically applied to the PLC media, this is a quite dangerous method.


When deactivating default mapping and doing manual mapping it does not work.

By manual mapping it means that i can choose:

Partner media type
Partner start address
Partner range
Map to PCD type
Map to PCD start address
Map to PCD range

Title: Re: Modbus TCP illegal datavalue
Post by: Mvlawn on February 24, 2016, 09:44:31 AM

What type/model of PLC are you using.

Title: Re: Modbus TCP illegal datavalue
Post by: RobinH on February 24, 2016, 10:01:29 AM

Hi,

I am using Saia Burgess PLC.
AdvancedHMI version 3.99C

Title: Re: Modbus TCP illegal datavalue
Post by: RobinH on March 30, 2016, 06:33:31 AM

Still having the same problem.

Any suggestions or solution?

Title: Re: Modbus TCP illegal datavalue
Post by: Archie on March 30, 2016, 07:48:06 AM

Try 40001 or 40002

Title: Re: Modbus TCP illegal datavalue
Post by: servrbc on March 09, 2018, 02:54:25 PM

Setting UnitId to 255 in TCP driver worked for me