Modbus basic functions

[Walbeek]

Hi there,

I'm trying to use the Modbus Master component in Flowcode V6.
With the "ReadHoldingRegister" I try to read the value of registers in the slave (PLC controller)
I use it with settings 1 (SlaveID), 40001 (RegAddress), 10 (RegCount)
I think the Master reads the data on registers with address 40001 .... 40010?
How can I use this data in the software, I want to copy the value's in Variables (Int)
For example, register 40001 to variable "Setpoint", register 40002 to "Status"...
Can you please help me out with this?

[Benj]

Hello,

The holding register address runs from 0, so address 0 is register 40001, address 1 is 40002.

I'm going through the MODBUS component now to try and improve the help so it's more obvious what needs to be entered.

[Walbeek]

Hello Ben,

Thanks for your response.
So I have tu use it with settings 1 (SlaveID), 0 (RegAddress), 10 (RegCount).
This will read data from register 0 to register 10?

I can't use the "GetResponce" command to check the data.
The "GetResponceByte" command can copy something in a Byte variable.
So when I use:

ReadHoldingRegister 1, 0, 10 ; reads 10 registers, starting with 40001
GetResponceByte 0, Setpoint ; copy's the data of register 40001, now byte 0 to byte Setpoint

Is this correct?

Another question, the Holding registers of a PLC are all Integer variables.
This doesn't fit in a Byte I assume.

Please let me know.

Rinie